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

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stinkwheel
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PostPosted: 21:05 - 11 Feb 2024    Post subject: Reply with quote

P. wrote:


Annoying re the kickstart, whats run in like for this?


As far as i can make iut, it's take it reasonably easy for 200 miles while running it on a higher premix ration (20:1). Then de-coke it, throw away the head gasket and drop the premix back to 25:1.

Made it to the dragon rally this weekend and I've done my 200 miles. It ran as expected, I was topping out at about 45mph, the thing is dog slow. It ran really well the whole way and perfect weather for the job, single digit air temperature with a constant high humidity so plenty of charge cooling effect and high air density.

There is an odd "misss" which it does in top gear only at exactly 36mph and only the first time you pass that speed after hooking 4th. I think it may be some oddity of the gearbox alignment. Oher than that, it never missed a beat, starts 3rd kick and runs like a sewing machine. The speedo shat the bed already which was not entirely unexpected and both shocks have leaked their oil out but given they are nearly 30 years old and have spent more than 20 sitting in a shed, I'll let them off.

It was running noticeably better on the way home, climbing hills better especially. Once the premix is dropped down and the compression is bumped up by the head gasket removal, it should find a bit more power. I can have a fiddle with the timing too and see if that'll dial in a bit better. Oh, and it's weeping a little oil past the gearbox cover which is unsurirising since I removed it and refitted it with the old gasket and in something of a rush.

I think the voltage delivery is really dirty, I'm going to have a look out for an oscilloscope, I've been wanting one for a bit. I suspect the reg/rec is not everything it should be, the electronic flasher relay had a tantrum a couple of times.

Overall very pleased. It's been a hell of a shakedown run and it's been to two rallies loaded up with camping gear already.

Got my pint off Virus.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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virus
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PostPosted: 08:59 - 12 Feb 2024    Post subject: Reply with quote

stinkwheel wrote:

Got my pint off Virus.



Good to catch up dude, curious to see how much more top end you get out of her with the head gasket removal and the premix change.

Also I still think it looks hilariously small next to you Laughing
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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.
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A100man
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PostPosted: 09:38 - 12 Feb 2024    Post subject: Reply with quote

stinkwheel wrote:

Overall very pleased. It's been a hell of a shakedown run and it's been to two rallies loaded up with camping gear already.

Got my pint off Virus.


Hats off- bloody good effort.
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P.
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PostPosted: 16:50 - 12 Feb 2024    Post subject: Reply with quote

stinkwheel wrote:
As far as i can make iut, it's take it reasonably easy for 200 miles while running it on a higher premix ration (20:1). Then de-coke it, throw away the head gasket and drop the premix back to 25:1.


Is that running without the gasket entirely at that point. Perhaps I am misunderstanding.

I agree though, it looks comically small compared.
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stinkwheel
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PostPosted: 17:02 - 12 Feb 2024    Post subject: Reply with quote

P. wrote:

Is that running without the gasket entirely at that point. Perhaps I am misunderstanding.


Yes, just throw it in the bin and run the head directly on the spigot.
____________________
“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.
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WD Forte
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PostPosted: 17:44 - 12 Feb 2024    Post subject: Reply with quote

Well really!
You'd think he'd at least wear a tie to these social events
Makes you wonder what end of the social scale these people belong..

https://www.bikechatforums.com/download.php?id=106648
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virus
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PostPosted: 18:01 - 12 Feb 2024    Post subject: Reply with quote

I must say, Scotts habit of wearing a vibrant hawaiian shirt really helps find him in a crowd on account of not looking like every other big bloke with a jacket and waistcoat Laughing
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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.
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stinkwheel
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PostPosted: 18:07 - 12 Feb 2024    Post subject: Reply with quote

WD Forte wrote:
Well really!
You'd think he'd at least wear a tie to these social events
Makes you wonder what end of the social scale these people belong..

https://www.bikechatforums.com/download.php?id=106648


I was wearing a pair of black tracksuit bottoms with white stripes up the legs as befits the origins of the bike but they had got heavily muddy from walking up the camping field and, frankly, it was too hot. I was genuinely wearing a hawaiian shirt and floppy hat because they were appropriate for the weather conditions at the time. It got chillier once the sun went down mind.
____________________
“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.
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that_impulse_guy
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PostPosted: 11:52 - 13 Feb 2024    Post subject: Reply with quote

you dont need my praise, but as a mostly silent follower of this thread since november I'm pretty impressed you went out on a run and got back ok already, all this from some bits in boxes a few months ago. Nice job.
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stinkwheel
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PostPosted: 18:48 - 15 Feb 2024    Post subject: Reply with quote

Thought I'd have a look at the electrics today. Did a static test of the coil windings which gave an equal resistance to earth on both sides and an acceptable coil resistance between the two.

Static unregulated output was sitting at about 25VAC at idle.

On my analogue meter, the regulated output was a slight waver up and down at around the 14V point as you'd expect. I tried it with the digital meter and it was absolutely all over the place, couldn't settle on a reading and was flickering up into the 100+V range then back down again. Tried it on AC and it was also giving a wildly fluctuating reading.

I think the reg/rec is junk. I managed to score a used YZFR1 reg/rec on ebay for £35 which is a shendingen mosfet type (FH16 I think) and the proper connectors on amazon for £7.50. I think this will be a good starter for 10, see what it does with that. Even if more needs doing, it's not wrong to have it.

Also scored a pair of used shocks off somethingorother for £35. They look right and the dimensions are correct. Seller had no idea what they were off either so it's down to a lottery if the spring rate is in the right ballpark. Only bikes I've seen with shocks this length are either 125s or harleys and they certainly aren't beefy enough for a harley. The springs are progressive which is probably a good thing for my weight on a tiny bike.
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“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.
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WD Forte
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PostPosted: 20:21 - 15 Feb 2024    Post subject: Reply with quote

Difficult to see what's exactly what on forum posts
and I miss stuff anyway
but have you got each coil grounded one side and tother's going to the RR?
if so that would be 2 half waves and a bit spiky I reckon

I'd probably first have tried lifting both wires from each coil and joined them in the middle as one connection ( no connections to ground)
then used that and each of the free end wires to connect into a common
3 phase bike RR

maybe you already did that, dunno

just did a quick scrawl on the white-ish board
i'd have tried the bottom version first

https://imgur.com/FbvcSTB.jpg[/img]
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stinkwheel
Bovine Proctologist



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PostPosted: 22:37 - 15 Feb 2024    Post subject: Reply with quote

WD Forte wrote:
Difficult to see what's exactly what on forum posts
and I miss stuff anyway
but have you got each coil grounded one side and tother's going to the RR?
if so that would be 2 half waves and a bit spiky I reckon

I'd probably first have tried lifting both wires from each coil and joined them in the middle as one connection ( no connections to ground)
then used that and each of the free end wires to connect into a common
3 phase bike RR

maybe you already did that, dunno

just did a quick scrawl on the white-ish board
i'd have tried the bottom version first

https://imgur.com/FbvcSTB.jpg[/img]


It's a wee bit more spohisticated than that. There are two output wires but multiple coils/windings in a star pattern, 8 in total but I think the top one is for the spark because it's associated with the hall effect sensor. Both wires do connect to earth (I checked, equal resistance) then feed into a standard single phase shunt type reg/rec.

Something to go at though. I think it should be possible to lift the earths (green wires) as long as I can work out which are to the charging coil and which are to the ignition. I'd have thought with that many coil stacks, output should be relatively clean. It's not dis-similar to the setup on the lucas alternator on my enfield which runs LEDs fine. I'm deeply suspicious of this reg/rec so I'll try swapping that out first which is a very easy job and see how it flies. If no beans, I'll have a poke at the stator.

https://lh3.googleusercontent.com/pw/ABLVV87tzr7JuF1r8drV345xeP0KBsFlKTznGpCNXIKjhRpPCijaRDo1ENBk782EJ6uF4dA9sRQslnkl-HEbMfsXuY5f8rHvvvGiOcuELjx6U7QlLqop8k5EhscmkFAF7jDXPTQ_YN3zViYUW5fTda--UY57=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.
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Old Thread Alert!

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stinkwheel
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PostPosted: 19:47 - 29 Aug 2024    Post subject: Reply with quote

Since the Minsk and MZ125 are both based on the same WW2 DKW design, I did some looking. Bore, stroke and port timing are identical. So the pressure wave dynamics should also be identical. They race MZs. So I got to wondering...


... Apparently yes they do. And only £55 delivered from Germany. Header is the same diameter, bracket is about 3" out. I feel my future may involve some plug chops.
https://lh3.googleusercontent.com/pw/AP1GczM7_P3s-I9oSXIGKRBRaiEyvocUD1iOg44EmgeMRj5YKX4Aau0LOqULjX8TCE0JphX0SHILyXKuh8Ra927qKvPMLbcQxCrFhFLrjuecqsIYbAr1hr33NEY0FAhbzO8H6inLKNtbbi6bj2iwSwYND2D3=w1557-h876-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.
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 19:56 - 29 Aug 2024    Post subject: Reply with quote

I had one of those on my MZ. Sportauspuff!

I'm not sure it did a great deal, but I liked it.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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stinkwheel
Bovine Proctologist



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PostPosted: 20:38 - 29 Aug 2024    Post subject: Reply with quote

MarJay wrote:
I had one of those on my MZ. Sportauspuff!

I'm not sure it did a great deal, but I liked it.


Got to be better than what's fitted, the existing baffle is coming apart, I farted the rear cone back on with my welder but it was wishful thinking, there wasn't much actual metal left and it's now making the classic hitting a baked bean can with a pencil noise suggesting the seagull shit weld has left the chat.

This whole system cost less than a baffle from Ukraine.
____________________
“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.
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A100man
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PostPosted: 14:44 - 02 Sep 2024    Post subject: Reply with quote

stinkwheel wrote:
Since the Minsk and MZ125 are both based on the same WW2 DKW design, I did some looking. Bore, stroke and port timing are identical. So the pressure wave dynamics should also be identical. They race MZs. So I got to wondering...


... Apparently yes they do. And only £55 delivered from Germany. Header is the same diameter, bracket is about 3" out. I feel my future may involve some plug chops.
https://lh3.googleusercontent.com/pw/AP1GczM7_P3s-I9oSXIGKRBRaiEyvocUD1iOg44EmgeMRj5YKX4Aau0LOqULjX8TCE0JphX0SHILyXKuh8Ra927qKvPMLbcQxCrFhFLrjuecqsIYbAr1hr33NEY0FAhbzO8H6inLKNtbbi6bj2iwSwYND2D3=w1557-h876-s-no


Awesome..

..now will one fit my A100 ( 50 x50 mm B/S) Thinking
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MarJay
But it's British!



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PostPosted: 14:48 - 02 Sep 2024    Post subject: Reply with quote

A100man wrote:

Awesome..

..now will one fit my A100 ( 50 x50 mm B/S) Thinking


It's not a matter of fit, it's a matter of whether the volume and angles of the expansion chamber match the porting and tune of the engine. You could feasibly move the power band to beyond the rev limit for example.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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blurredman
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PostPosted: 14:49 - 02 Sep 2024    Post subject: Reply with quote

It might not make any difference but make your ears bleed. Laughing
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Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
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stinkwheel
Bovine Proctologist



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PostPosted: 15:08 - 02 Sep 2024    Post subject: Reply with quote

52.4 x 57.9 on the minsk.
____________________
“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.
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MarJay
But it's British!



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PostPosted: 17:41 - 16 Sep 2024    Post subject: Reply with quote

I found this pic the other day...

https://www.bikechatforums.com/files/dsc02021.jpg
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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stinkwheel
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PostPosted: 10:53 - 17 Oct 2024    Post subject: Reply with quote

Well, the exhaust bolted right on with a very simple bracket. It rode fine, not much different to the original one in fairness.

Out of curiosity, I decided to take the end can apart to see what was going on in there. Turns out it's literally a metal cylinder stuffed with fibreglass packing. Doesn't even have a baffle tube in there, there's just a long spring to stop the fibregalss from completely obstructing the gas exiting.

So no stinger on the end of the expansion chamber and a surprisingly wide exhaust diameter. I decided to make a baffle tube. Used a piece of alloy tube, necked it down with a steel insert at the exit from the expansion chamber so the diameter is the same as the standard, then a 12cm stinger section then perforated the rest of the way. All bolted back together easily with the packing round the outside of the baffle tube.

Immediate transformation. Crisp, rattly exhaust note which I associate with a properly setup 2t exhaust. Way quicker off the throttle, fewer "bung-bungs" on the overrun which means it's scavenging well. Had to wind in the idle screw significantly so it might need a larger pilot but frankly, it hardly ever uses low revs unless you're stopped in traffic and the idle is very stable. Picks up well from no revs and pulls much better through the midrange, I can stay in top gear up hills I was having to downshift for previously.

It would probably stand an extra tooth on the front sprocket now, although I might do some light offroading on this bike becuse it's very capable on dirt so I'll probably just leave it as-is.

A plug chop showed a nice clean, brown electrode but I tried the next jet size up just to see. That was too much main, caused it to bog between 3/4 and full throttle unless it was absolutely flat-out so went right back to standard jetting.

Saw 50mph on it, which is a first. Money well spent, although the standard setup on that exhaust was very shonky. I'm guessing it's for noise reasons because it is a tad on the loud side now. Probably not enough to have people tutting as you ride past but if you were doing laps of the town square all afternoon, I could see people getting annoyed.

The postman says he loves the smell coming out of my garage when he delivers the mail. Smile

Did a short video.
https://youtu.be/V2Us1UyyGZk?si=WEw2JMF-HP8fFqmd
____________________
“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.
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A100man
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PostPosted: 11:04 - 17 Oct 2024    Post subject: Reply with quote

stinkwheel wrote:
Well, the exhaust bolted right on with a very simple bracket. It rode fine, not much different to the original one in fairness.

Out of curiosity, I decided to take the end can apart to see what was going on in there. Turns out it's literally a metal cylinder stuffed with fibreglass packing. Doesn't even have a baffle tube in there, there's just a long spring to stop the fibregalss from completely obstructing the gas exiting.

So no stinger on the end of the expansion chamber and a surprisingly wide exhaust diameter. I decided to make a baffle tube. Used a piece of alloy tube, necked it down with a steel insert at the exit from the expansion chamber so the diameter is the same as the standard, then a 12cm stinger section then perforated the rest of the way. All bolted back together easily with the packing round the outside of the baffle tube.

Immediate transformation. Crisp, rattly exhaust note which I associate with a properly setup 2t exhaust. Way quicker off the throttle, fewer "bung-bungs" on the overrun which means it's scavenging well. Had to wind in the idle screw significantly so it might need a larger pilot but frankly, it hardly ever uses low revs unless you're stopped in traffic and the idle is very stable. Picks up well from no revs and pulls much better through the midrange, I can stay in top gear up hills I was having to downshift for previously.

It would probably stand an extra tooth on the front sprocket now, although I might do some light offroading on this bike becuse it's very capable on dirt so I'll probably just leave it as-is.

A plug chop showed a nice clean, brown electrode but I tried the next jet size up just to see. That was too much main, caused it to bog between 3/4 and full throttle unless it was absolutely flat-out so went right back to standard jetting.

Saw 50mph on it, which is a first. Money well spent, although the standard setup on that exhaust was very shonky. I'm guessing it's for noise reasons because it is a tad on the loud side now. Probably not enough to have people tutting as you ride past but if you were doing laps of the town square all afternoon, I could see people getting annoyed.

The postman says he loves the smell coming out of my garage when he delivers the mail. Smile

Did a short video.
https://youtu.be/V2Us1UyyGZk?si=WEw2JMF-HP8fFqmd


It sounds better than you do.. Wink got a cold?
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 11:52 - 17 Oct 2024    Post subject: Reply with quote

A100man wrote:


It sounds better than you do.. Wink got a cold?


Spot up my nose. Not quite ready yet, anticipating instant relief later on today!
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“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.
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Easy-X
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PostPosted: 16:44 - 17 Oct 2024    Post subject: Reply with quote

Sounds very nice Thumbs Up
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MarJay
But it's British!



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PostPosted: 17:42 - 17 Oct 2024    Post subject: Reply with quote

It's got something of an air cooled MX bike sound to it. I like!

I miss my MZ but I found an old FB post about it today that reminded me the primary cover leaked oil continuously... which is probably the gearbox output shaft seal.

I'd love another MZ 300 but I'd want a mint one, and ideally a Saxon fun again. I've got my KR1S to meet my 2t fix though, so I probably won't have one.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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