Minsk 125. CCCP era 2-stroke commuter of the people.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

It's worse. Massive cock-up.

It goes in the middle of that plastic bushing between the two main bearings on the drive side and supports the lip of the bearing seal. I fished out the old seals and it sits down into the recess in the seal and the seal mark on the bushing matches up perfectly. The ID is the exact OD of the drive shaft.

It's not labelled on the diagram in the workshop manual but it has to be that, makes total sense. When you look closer, I think it's in there.

I have no idea how it landed up in the bag with parts for the kickstart assembly or how I missed it when I was dismantling the thing.

I need to dismantle practically the whole thing again to get at it. I hope the gaskets come apart in one piece and I don't damage the bearings doing it. The gasket sealant should still release because it's not been run.

Here's the diagram. I've marked what I think is that bushing with a red dot. It's not labelled at all. Neither is the outer main bearing.

17-spacer bushing; 18 - cuff of the crankshaft (crank seal); 19-washer; 20 - bearing lock ring, 21 - crankshaft bearing.
https://lh3.googleusercontent.com/pw/ABLVV87ZjslVagZ9PnvGJV3hObSAZHVHU9XrdW8hX-J4WjF-k1Ajy_8W-RS5o8WZt0tUZwXOYUCnYktJXJ8H5c_7d8BA2j1hjVFOjIqD7i4fJMwMUJioDD3H3Zeq_1bH4KSZeiTiRqZxHqpkt795U0Qj2zZs=w837-h870-s-no

Guess I know what I'm doing this weekend then...
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

The more I look at this, the less it makes sense. I'm up for input from the team here.

Here's that mystery spacer sitting in the old crank seal. Perfect fit.
https://lh3.googleusercontent.com/pw/ABLVV85OGSSbA-j6Q2TfNiOBKMABm61bp813x8Ir7OfPRSrwMbIzjMtoZF-iZShwWRjfqtP-gFmRUyQWsPtV65qXeVrRePAgSnmwq18vhIVTV87AQxBmnvvU9CHswIweCvbnN-Kks9xv3SCVMasFo2bL64bz=w1547-h870-s-no

The wear mark lines up perfectly.
https://lh3.googleusercontent.com/pw/ABLVV87_EawBzpApT3jloZ2sFn4D4fFlBNWiGuDsEwUBeV3cUkIaAE5GLwR4ZcigAWMx2AJbm07dT8yfcywmHaLZlJjucos3g10rboNzVaiGwXFCRuw3M242PnwyFgBLv3C7zW5eli8UtUC28KGASb8AJQgo=w1547-h870-s-no

However. That face of the seal was 100% definitely up against the weird star-shaped washer, you can see the imprint it left on the closed face of the seal.

The manual shows (from the inside out) main bearing > circlip > Washer > Seal > Spacer > Outer main bearing.

While it's a fairly shitty reproduction of the diagram, it is obviously a technical drawing which to my eye confirms the orientation of that seal as having the open side facing out, the seal on the right side is shown with the open side facing in. Which is also my recollection of dismantling it. Not my imagination?

https://lh3.googleusercontent.com/pw/ABLVV840E43oZx6MuBfWJreDsswL2qbKAMroX_8cUaOAy8vKIiVkO2ienYmXK39ROS2JwX2QWTKPicD5TYaRFfIV4Sg53zHppfPPBlBLPyujbTGyCR9cGIYV8sMV6T5pB6lGLDjopEzr7nbHO_-yf_ZzxMSd=w1123-h794-s-no

That being the case, there's no recess on the inner face of the seal for that spacer to fit in, it would butt against the inner seal lip, which would be a no-no?

So for the mystery spacer to be there, it would all have to be assembled in a different order and with the seal in the opposite orientation. It would have to go inner main > circlip > Seal (open side facing in) > Star washer > Plastic spacer and mystery spacer > Outer main bearing.

There's another one of those star washers on the other side and it 100% definitely goes between the circlip and the seal (but was fitted with the open face of the seal against the washer).

I'm now wondering again if it is a red herring and I've got a random piece which shouldn't be there that just happens to fit in that recess. I'm also wondering how necessary it is if it's supposed to be there. A normal 2-stroke has main bearings then a crank seal pushed over the outside and that's all she played. There's nothing supporting the inner race of the outer bearing against a thrust load. But would directing a thrust load against a bearing seal be a good thing? I can't see where it would experience a thrust load anyway, the bearing is supporting the drive shaft but the engine sprocket is on a taper, not tightened down against the bearing race.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

This guy adds to the confusion. No star washer or mystery spacer and he's put the seal on top of the plastic spacer with the open side facing in.

https://youtu.be/NMhR2TxKQZs?si=rXDHs9YXbGPglHZl

EDIT: However this guy goes circlip, star washer, seal with open face to the outside, plastic spacer, outer bearing. No mystery spacer. He's done what I did but with lots more hammer.

https://youtu.be/8J8xi0yoDeI?si=VT2CvTHmSXNVJA3t

No spacers or washers, seal open side facing in. Lots of hammer.

https://youtu.be/lv3JCmjguCM?si=MnDBeiEF3PFlERSh

Another like mine.

https://youtu.be/4rRvShDDm9A?si=lLzGcp5aRocHbSYE

Take home. 1) None of them have that spacer. 2) You can be a hell of a lot more hashy than I've been and have a running engine.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Ok, so no need to dismantle the engine again. Carry on. Still no idea where that spacer is from but I'm sure it'll become apparent eventually.

Barrel is back from the engineers. It'll need painting and such but first some mucky jobs since it's covered in swarf anyway.

It's a dead simple design, alloy head and barrel with iron liner and a spigot joint. There's an optional ?alloy? head gasket which is just a ring. As I remember the instructions with a new one were to run it in on 20:1 premix then take the head off, de-coke it and throw the head gasket in the bin, then drop the premix to 25:1.

https://lh3.googleusercontent.com/pw/ABLVV85uHcBHzduLItZfNRykzqIez2D5-ofCTwECj8NTi7CDGdRdf2gbXlEoTnGbuIjcWLIqv6yd2QE0cWEiiBCTEbTkORazbQhL4hYRADRNMXInw1WH6Vi_R5oTsyDoqhSHjbu4huy2OpSygbYuc6nc0gZW=w1547-h870-s-no

Worth checking how good a seal it is on the spigot. Sharpie makes a reasonable substitute for engineers blue.
https://lh3.googleusercontent.com/pw/ABLVV869659F58ZyKEvCzDtQoNhU4DfaxCuiP7MQYNGBOV-UsMJP_c1YF-pUAJHch88wzcSKzqPAGYzzZnx3jv5pZxe8qOWD4MAN7oRT2nJldwsFynZlpc5z53yOA0DPcMTdRdlgbtIdGNGdAQ8xHvNEfmwa=w1547-h870-s-no

Lapping the head against the spigot shows there is a reasonable degree of sealing but mostly round the outside edge. Gas will probably get in there and start coking up between the head and barrel.
https://lh3.googleusercontent.com/pw/ABLVV87MkLD0ZMEqdf3_QybhbER2aWHiUXxHcLQeMmKTRgRIDs1nqd9D9Xaq2a-UvbC_D0z55dUFhxYyScmMiGukHcaT03pcSjy7s6tr1tGv3MNVAGpjj793k1EPtJfNWvkDk03qu7-CPA9v7AkpKy9wwGvM=w1547-h870-s-no

I do like a grinding paste tin.
https://lh3.googleusercontent.com/pw/ABLVV84VDChTBhMCFjqwJavYfA3k-neoaDxnIkPB9jlmNywH-vwSFU_pSNob_PEDMLtDN_z95nc3iOamx9tan_0-Sn0bEp0GJLvbyCBCp9eN3E-fGjbGGkRWANZ78QKmNqweoUJyscXQ1ah6QO8OPEQo6KdZ=w1547-h870-s-no

About 20 minutes of lapping and this is the post-sharpie result which I'm happy with.

https://lh3.googleusercontent.com/pw/ABLVV86w9nJ5LBHvs59IG4K1jJNRPQzQ8vJnmoIGlDmgmQuW5vfevm7b7Qt28I_ODWqsN6ocK7coKkLf89IVftUEcw2u21x305qOYN24AFruFeTRDCVteJyGhSpK56_5uZErIuzInP3476mwBn-hCsv-5pjL=w1547-h870-s-no

I may give the inside of the combustion chamber a bit of a polish if only to make it easier to de-coke in future. Hope to get the head and barrel cleaned up and painted this weekend, on-call allowing. Then I need to go through my big heap of piston rings to see which two fit best.

Small end bearing and new snap rings are en-route but no saying when they'll arrive with the christmas post. No matter, the engine can now be fitted in the frame any time, the barrel can go on later.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Found it!

Mystery spacer solved, it goes over the gearbox output shaft. I ordered the wrong seal thinking the seal ran directly on the shaft. Put the spacer in the wrong bag.

That's a niggling worry off my mind.

Right there in plain sight on one of my photos.
https://lh3.googleusercontent.com/pw/ABLVV876GJw3XQiYDRleyvAM6ZPwg7u4Yhq2GP5DqbgorAYz7IYH2OrknXkPV7-CKhqDLdUWA9_YTk4N428HXmh9evvk9TUz4MX6ziBqEAJ9DE87FpnWJ_VuYDLRegkuyJaX6Xbik3aDqyPZkQpqbfu8I4Wu=w1547-h870-s-no
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

virus · World Chat Champion Joined: 17 Aug 2006 Karma :

If ever there was evidence showing why its bloody useful taking lots of pictures when your doing something complex then this is it eh?

Imagine if youd have split the cases again to try and solve the mystery Laughing

____________________
own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Swiss cheese model at work. Three things went wrong. User error was the main one, I put it in the wrong bag. However, the original seal was destroyed by the bearing having collapsed, no way of measuring it so I ordered one based on the diameter of the shaft and the seal holder.

Having fitted that seal, it all went together fine. If I'd had the correct seal, there would have been a gap between the shaft and the seal when I fitted it.

Easy fix with it having a seperate seal carrier, six screws and it's off. Amazon had an oil seal so it should be here tomorrow. If it's shit and leaky, it's easy to swap out again.

In other news, painted the cylinder head and barrel today. I'll cure it in the oven tomorrow then I can get the oven back in the shed out of the way mask cycle parts masked ready for primer later in the week or on Christmas weekend. Should be able to prime everything but the rear mudguard which will need support plates welding onto it but I don't know where they will go until I've got it mounted to a frame with a wheel in it.

Also find out if I kept off the naughty list well enough to have a TIG set do do said welding (or more likely bronzing) with.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Got the barrel and head painted silver and baked off. Not the neatest job of stripping it but anything that was going to come of, is off. Should really have been soda blasted but maybe that's a thing for next Christmas. The castings are dead rough anyway so it'll look good, especially with the rubbers back on it.

https://lh3.googleusercontent.com/pw/ABLVV84XZBD97j6tysJfQsrg6MxAv5MJ3q3bwxe-3jqBmYFvf8BrDb2XrzAOeD9CW-jUaYD1jp2cabLNRQdvFTwr3ukFtRClb_Itxb_f88uUHfH_AitTgk2b85Y6rpXZKKTQ3tAVFS5quTP3rIgbC0htNC0W=w1547-h870-s-no

I have a literal handful of piston rings. They look dead manky here but it turns out they were covered in cosmoline and wiped down nicely.
https://lh3.googleusercontent.com/pw/ABLVV86uLvhE1NnN0N3slmaDNrOonaAqPpgZx8wfmAB00lHaNxwoQPRgDnsDfy9KkMvoIIcO-Io5P5VoIoBnQ6IOxaOZ2WGzR3WStfbtceEeN8YxrNEBdCNvwIcmZEzdN3H2C8X335c37Aos5nmsenx9SQJZ=w1547-h870-s-no

Looking for an end-gap of 0.2-0.3mm. Nothing for it but to clean them all off, try them in the bore and see what the best two are.
https://lh3.googleusercontent.com/pw/ABLVV87DUU0YxOXRBadxBiLhVMiD-cEPCzRm4zXIWXWPcE3I10sWtFnauOZsXHjAMOSKlSQ5zzH2plZuPGQi-SN1r4yfNE7xNqwv6IW9HQLSndE1Nj66hWbBz3hQTIwejDZ0TLpFhm2Q9IG1oHbB6TeEhxR7=w1547-h870-s-no

This one's a hair too small, most of them were oversize.
https://lh3.googleusercontent.com/pw/ABLVV86NQPKgiOYm85aq_W1Eve9WiELrtVHHxoV72RixMKwY9kl02i012JEGpvPVsoAHVcy14R5gMRpq1aGKXwi47X9rWrB9lVOU4wgve4WBd4eOhuL7ugX3pfV6HBAhB6GwqR2XBmsfoHe8p-CChFPzGe-x=w1547-h870-s-no

Got down to six within spec.
https://lh3.googleusercontent.com/pw/ABLVV86jI8jb0G8VBkJX9SdlJE6LRqPqQChIdWZWtf6e4EzCh8pe7XF6xVd_ZDZWPpk33SVTV8lpL4zxuDre7VQZXazFR8yJrw4JQKD3iatakLSpG-oRAYms_sPWASJqF_Q0qFU22j3sdOjX1I0wKq_WTlRs=w1547-h870-s-no

Of those, one was at the tighter end betwen 0.2 and 0.25mm, the others were between 0.25 and 0.3mm. On advice from a mate who knows his engines, I'm going for the tight one as the top ring and I'll pick the best looking/cleanest of the others for the bottom ring. I'll give the opistona run through the ultrasonic before fitting them though.

https://lh3.googleusercontent.com/pw/ABLVV86DsXCO5weQqzK6Q3BtcwvWRyihd-1014Gi1hqFMJCjZA4FYOaanBrGdwExRSyoI5xqEokSPcvi4i5hG8b1rNg5VlHEsEAukoN6hAMLGE26iYCmKWFaQSZvKgMOj3tnx3eBSdyOX58zyiv32zVestfD=w1547-h870-s-no

A perfect fit in the lands though with a sliding 0.05mm gap.

Small end bearing arrived today as did the generator kit from Ukraine so thunderbirds are go. Hope to get the undercoat blown on on Saturday. Might get the top-end on the engine before then, only needs the piston fitting and four nuts. The electrics can wait until it's on its wheels.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Just checking the sparkplug. The one that was in it was a Champion L92YC which is equivalent to an NGK BP4HS. That seems more than a tad on the hot side, I don't think I've ever seen a #4 plug used anywhere.
https://lh3.googleusercontent.com/pw/ABLVV87y-TEyabX6zO8Yf0cxaqBNjgzuo8okJz7jepZ6qcRh-LRO3LB78aPt4OZFv-oVJlT0UIbr3raMXUao_NaIGBz_BdOxmM6qQGhnEB8zxSqiMZUG3LNnCiNGH7G0iGKb9gzZ0FEBiA3xc438s6rtSNot=w1547-h870-s-no

Book spec. is an A23B (doesn't mention make) but I found it on a cross-reference chart as equivalent to a BP7HS. This seems more sensible and is one grade hotter than the ones my Jawa 350 used to use.

Previous owner was clearly having issues with this bike oiling up to have gone three grades hotter. Either that or they just threw a random plug in and wondered why it kept seizing (It had seized at some point by the state of the piston).
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

virus · World Chat Champion Joined: 17 Aug 2006 Karma :

4 is one hell of a step up thats for sure.

Engine is looking very tidy compared to the before shot. Im interested to see if it remains that clean once you've started riding it, base gasket especially.
____________________
own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

I think a lot of the mess was it spewing EP90 oil out through a collapsed output shaft bearing.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Busy spraying today. Got everything but the mudguards (which will need modifying) in tractol alkyd resin primer. 2 coats.

https://lh3.googleusercontent.com/pw/ABLVV850BmFsM_-UJ8dTsX3gjewCD_RHjhLp7M00Xa0il33kgZkieIRnmbDi8_xRVSoz8aTZrNqIRwUFx30fVCVZ7EGu6Wmp0ogpszHDc26PBti-o6CsyFJmfEMQxOZj35Jjm56knrnRhogR3TTAQwtcn2PH=w1547-h870-s-no

https://lh3.googleusercontent.com/pw/ABLVV86Vt6gga7_9Agr5pdAiKFOxGAcds8C3cc9rRTq3J8YyOqZBAR4iDlc-54_vGO_teofVpOPzsIa6A7r-PBqltcENubCkfiuS5PONJyULmC28j5AD1qVhld1mcmkzsiMseip8i-kd8S5B6aygPkhZXZcU=w1547-h870-s-no

https://lh3.googleusercontent.com/pw/ABLVV85sih4LGHonZLqAj2hqnrPVAEWNmwSbWbBDEYYIPtdE5vjmuojGe4tfzRElBO2oAsP2YRv3scnpabDSlw9k0DfsZQ5vTq2ngkwR9Cjbueukb-W3Sn97ViK7bjC_q34cDtwfDlxFpDCmR5TUT3Yh9eJE=w1547-h870-s-no

https://lh3.googleusercontent.com/pw/ABLVV844ORRxNEr8oiXHYZnWZz5ph1Q1QENvec5r_V05AX2lIsjEB3nwBPfJpMYUl_4oB3hS1Edd56sp8Kq84uGnMFhK4xGoCsylYIIb6CQ3YDGygQAwuMxiABfLYmbiE5B3cDU4v90-SizfabMCiKiwouTq=w1547-h870-s-no

Then blew a coat of top coat onto the gloss black bits. I'll need to thin this stuff more for the final coat, it's clagging up my small spray gun and not pushing out the volume I need to lay on a thickish coat. Not a bad thing to have a thinner coat for the first one but it needs a certain thickness to self-level. I shouldn't need a clear coat with this paint. It's only an 0.8 nozzle on my little HPLV gun. Looks like you can't buy bigger nozzles for it so I'll need to go with thinner paint.
https://lh3.googleusercontent.com/pw/ABLVV857f8SPV69hC1rjncUDDYpps1D5ucKXdxkjb8gNFQ5tg5O9o1ZzEtXd6ExD9u0ivlbW9IqvT7y3CcAZcEagUnSzu3E3YrjFG3dw-LKErnWgXZH5efTVRB9OtPQPQTw-o4n_DzVIF_9YdDqq2BeLnhLk=w1547-h870-s-no

https://lh3.googleusercontent.com/pw/ABLVV86oavlqTJd3vCTOA7V4JqjIA7mnFADnTqCxp1A_wqc1TRaeYsN6BIMxA0ShSSZsfUPMIgJ0Q0__YcQi5tnEXbeDyO23jWWrABL6tMpSNRN2fkfQ6JK_ZYZsxXjO_LhXafxCsXBYFQWj7fJsr4ac1GWU=w1547-h870-s-no

https://lh3.googleusercontent.com/pw/ABLVV86rULhMbK2_iGEE31sJ1zKHfGartDwx9SPk7--YjTID2gCfezz8ftS2a74UsZqOGQ1A2_AYhN1Gy2BC8slpfBUI4GmS_uA-0sRNuZkrgSULjPMhCLCAPb_ksXJWt1F4EemLJ6TNHCfn2ixGFpAXppvV=w1547-h870-s-no
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Final coat of gloss black on the frame, swingarm and yokes so I can start assembly in the new year.

https://lh3.googleusercontent.com/pw/ABLVV87JBj7CDskUClnlWEftNoiAFSFXcYspoCdDXCZHcJXjxDkMxYc_igLLV8RpbLCgm0Z_h3ZAJa0BnKJB0awrEIfibJ18M9VP7PHuHyCwMZ6MEja7-s02P8pkpF3qXut-OAkP3Ily1-3KFa-0lf_tp9P8=w1547-h870-s-no

Also needed body colour on the fork shrouds as these will need to go in with the frame. Two coats ought to do it, the final coat is laid on thick so it self-levels.

https://lh3.googleusercontent.com/pw/ABLVV84YMmTbddHl6FwgEr295DAdJNVClgMA5-13uBudvE1gV2RVWkmjm_jKC38BXQtoy0yPWu1Z2aHKwK9Um2-P4XRox5J3HKm2VGwN_sJv6aDFifhnzoC2vLN1QOV_GmiV-eoF1XKpo3k1WfUOboXmamcz=w1547-h870-s-no

Thought I may as well give the tank a blow over too, Looking at least as good as the original paint and the colour is a very close match. A rub down and another coat should see this right. The toolbox covers will need more work but I can do them when I do the mudguards. It's a darker blue in real life the flash makes it look worse than it is.
https://lh3.googleusercontent.com/pw/ABLVV84tcIu17UC3LCDoT1MeP61g1t-OX_TAV-B1LkbrE9pgqBL7U_c700n5pwAcDMvptiAKmtGhtLXpAW102G3axPyvVE61s_zUSE5QsEeZLocowTEEl3qHK8tyXERIASeNvxPqb9yoDxesC7QXetr7PPvL=w1547-h870-s-no

https://lh3.googleusercontent.com/pw/ABLVV86qMv-H5pyFvFlPPFYKLjfq_L6zXAeP3FTcaIHUgx6d2S0qDdqOaDmL5f2y3_kBRH56wEQn0pkfLCTx14RAnzCHuzedP-nLnj_4W6zhLTYJnfklrDXbD5Z2UIErqOh6t8Q4ONC8cqSzYUftf0yAfWZU=w1547-h870-s-no
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Big day today, got the bike on the bench.

https://lh3.googleusercontent.com/pw/ABLVV85yeVtk8kwjbtALpYM3nkLBI6Pa1Xg-uNrFxk4hnPuaHGqgKiAjiQN4kbb309-MwFvXf2B8jTUcR_tBFCr9ukCmu-VHz2UC31lSnr39yQ7TEGYUuNgIK8_ZuewoD1ryixhO7ZXBHPwuApfgBKFBBvOw=w1547-h870-s-no

Swingarm is dead simple, nut and bolt. It has a metelastic bush so I'll leave it loose for now, it wants to be nipped up tight at the centre of its normal swinging arc to avoid overstressing the rubber. So that'll be with the bike on its wheels and me sat on it.
https://lh3.googleusercontent.com/pw/ABLVV87NhNvUmrFEmMvcU6cJCxJy2VvEqU6Kn5IQopy_LlBmukd69eKbBFWKbUGy2-MIFM0VQR6_PSxIOFDR16OE4NRgCYqh-i-LUcViZPYEWcmpw5XULfbQOTW_qHJ_qCncDHGH2Ynzsc7uRrE1Jc2i1QLJ=w1547-h870-s-no

Found a brand new set of steering bearings in my boxes of bits.
https://lh3.googleusercontent.com/pw/ABLVV8660zNjCLns43WgP5399ljs6ZFEnD7iKhBWo5KWfhi6uRBuia-BXn3jsGcqNakAAVUJ87DHt3fNHsiOaE0XtYsAFyTKpPQM8791nfaUqcLr0Tje8wBpASKNfaU-NReJoo3wF-zFGGnSdsRwIjyXkBh2=w1547-h870-s-no

I've used UK bearings in them though.
https://lh3.googleusercontent.com/pw/ABLVV84GLLIfHOJGzWBkRKUw4CF-o8ITaakjv7tG7eNMWeQWvl8sQ85qmgYfgQcc16Vh-vPzY9ydmnyJa7MuIFykBy9g782xu-fnpHn26u5W-kihPOqI5CSb7Kl8Rxz0Gvk8XR9SDHDCd8jN7mksrr2tyO4_=w1547-h870-s-no

You fit the fork shrouds first then slide the forks up into them. I've held them with the lower pinch bolt for now, they'll need pulling up into the top yoke taper with the top nuts. They're a ball ache to fit so I'll wait for the fork oil to arrive. The shrouds were rattling loose when i first fitted them. The joys of buying a bike in bits. Careful searching turned up a couple of chromed trim pieces which fit in the top and make them a snug fit.
https://lh3.googleusercontent.com/pw/ABLVV85a6TOahJIkO6yjxxJE8AzBGhHByiymdgd0Aj7rYxlkEAdWu41PtRHg_o-1nM_4kJhvyjQGO7NBTxB1rCrdcKcaxq6a8BGhPfR3mx0gdkHbsecgYFvSDO6J7kpjHGTV5xE0hDS3pC7rs83it9oONlup=w489-h870-s-no

Here's a good example of what I'm fighting with. So how much fork oil and what sort? I found the diagram of the forks in my workshop manual and ran the relevant paragraph through an image recognition app them through google translate.

So we had "Напомним, что в амортизаторе должно находиться 150 см* веретенного масла АУ или его заменителей (например, смеси автола с керосином в пропорции 80:20);" which translated as "Let us remind you that the shock absorber should contain 150 cm* of AC spindle oil or its substitutes (for example, a mixture of autol with kerosene in a ratio of 80:20)."

Hmm, AC spindle oil? Ok, search for веретенного масла АУ. Which gave me a drum of oil on a Russian website which listed an ISO standard. ISO standard turned out to be for HH light hydraulic oil which makes sense. Found some of that from a UK vendor which listed viscosity specs. Cross referenced the viscosity spec on the Ohlins website to give me 7.5wt. So I need 150ml of 7.5wt fork oil in each leg. Phew!
https://lh3.googleusercontent.com/pw/ABLVV84yPQpiGG7UsEhHAb12omk4p8l7w60ffIcxSdk8M_d97oOTbpJLGGVZy582PnNzRgzclUbf9gsLIwy5OyLSBxCwR7qdkqdwHm-P7t35PQ-GhBFmQBRk-kCTnc5JKmcG96zyjyIUroGqHTwcswZbPaR-=w1547-h870-s-no

The shocks look in very good nick. Time will tell but they'll do for now. The bolts are made of cheese so i've ordered some replacements.
https://lh3.googleusercontent.com/pw/ABLVV84UCHJS3zw1Fe9O_UW2amo9Nl_GDn9kJIWUXu2hrAGyQsru8SjDnnF377bPGFXE6rHJ0NR0jauwMHfZe4AtI4zMXyMkOoq8fi0IZ9VNCnZ_45-CVNr1HHhyYyEhNWsUVpK2O9AKfTMJondH7p6QKavF=w1547-h870-s-no

Starting to look a bit like a motorbike. Wheels next I think.

https://lh3.googleusercontent.com/pw/ABLVV87AY8ymNwMSyJa2ROhTwogm5uhXi8-ZFZyw6D-xrho4Q-dFy3Bwp-q5PbJVIOxaC7y58M6B7Z_Iy8g0uDMkYyLB6_VigQz428RqB7gjakHzf5cLAx58O2MJ-MbnoQO2PGh-MHQIr-ejS7f4oYbKds4_=w1547-h870-s-no
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

No photos but I spent yesterday evening with three broken speedos. The correct one in which small but essential watchmaker-sized parts have gone ping, an incorrect one which is fully functional but has broken glass and doesn't fit in the dash and a third fully functional one that's too big.

I'd hoped to be able to put the guts out of the working ones in the smaller casing but nothing lines up properly.

It turns out the drive ratio is oddball. It's 19:10 which is exactly the same as used on BSA bantams (figures, they were both copies of the same bike) so I can't use one off another bike. Bantam copies are available but are a few mm too small for the dash. Could be made to work with a bezel adaptor and would be in mph.

I finally ordered a used one for a different soviet RT125 clone (a Voskhod). I'm hoping I can swap in the correct speedo face but if not, it'll do as-is.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

A100man · World Chat Champion Joined: 19 Aug 2013 Karma :

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

struan80 · World Chat Champion Joined: 04 Nov 2014 Karma :

Never mind atoms, this is proper engineering Smile

blurredman · World Chat Champion Joined: 18 Sep 2010 Karma :

I would wonder if an o-ring chain might be too wide and rub on the sides and wear through holes in the enclosing tubes, when they were built for non- o-ring 1/2" by 5/16ths chains. Question

____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S.
Current: 1973 MZ ES250/2 - 17k, 1979 Suzuki TS185ER - 9k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 38k, 1989 MZ ETZ251 - 49k.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

virus · World Chat Champion Joined: 17 Aug 2006 Karma :

That mudguard looks like It will give you advanced warning of tailgaters Laughing

In other news, It is definitely looking like I'm going to owe you a pint in the not too distant future Thumbs Up

____________________
own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

The mudguard isn't as bad as it looks there. Suspension is at full droop.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.