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Riejufixing |
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Riejufixing World Chat Champion
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- Super Spammer
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bikenut |
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bikenut World Chat Champion
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bikenut |
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bikenut World Chat Champion
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- Super Spammer
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Posted: 12:16 - 05 Dec 2019 Post subject: Re: bits |
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bikenut wrote: | You're right. I never knew that and have never seen an engine without a small end bearing before.
pick a jap 2 stroke, look on cmsnl exploded views for that bike, say an rd250 yam.......
now you know why cmsnl is so usefull, for warned, for armed.........etc.. |
I still have 2 X TZR250's and a TDR250. I also used to have another TZR250 race bike and have rebuilt them many times.
They all have roller small end bearings, as has every other Yamaha and Honda 2 stroke I've ever refreshed, from DT50MX, MBX50, NSR125's to DT-E125.
It's a new one to me. ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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bikenut |
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bikenut World Chat Champion
Joined: 21 Nov 2011 Karma :
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Posted: 12:28 - 05 Dec 2019 Post subject: bits |
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Huge que in post office so missed transport connection, so have some time...........
I live in Warrington ( i dont but hayho ) and need to get to Talybont ( which one i hear you ask ) .
How do I find my way to there?
Sat nav ( don't have that ), google earth ( don't have that at home ), i could ask someone ( they will send me to the wrong Talybont FFS_) ....or read a map.
Moral, if you don't know, ask, or find out.
I could always come to where I am now and use google earth, wow brilliant.
I expect to fix a lads cb125 but don't have a manual or even seen the bike yet.
I could ask, or i could go to cmsnl for the exploded views which will show me stuff like, does the engine have an oil filter screen, a centrifugal oil filter, screw valve working clearance adjustment method, cb points or cdi ign etc., etc.,etc.. It also shows where they are on the engine ! Brilliant and its FREE.
A picture is worth a 1000 words, and if a helper is looking at the same picture as me, happy days.
If you still don't know how useful cmsnl exploded views can be then you are probably beyond help, or have a brain the size of the planet.
Back to the cb125 thats making all that noise.
The cylinder head is now off as you have shown a picture of the piston crown. There does not seem to be the bright ring mark on the crown to show the crown has been hitting the cylinder head.
The big end may still be "slack" so check for that as mentioned earlier, just to rule that in or out.
With the cam chain arranged so the crank can be turned safely ( so chain does not bunch up on crank sprocket and cause problems ) set piston at half stroke, now rotate the crank everso slightly forwards and backwards to show any play in the big end.
If the piston stays still, and the crank moves slightly forwards and backwards say more than 2 degrees ish ( the less the better ) , then there is play, either in big end, little and/or main bearings.
Remember that this engine has a balance shaft system, maybe that's where the noise is coming from?
more coming......
https://images.cmsnl.com/img/partslists/honda-cbr125rs-2006-6-england-crank-shaftpiston_bigecpp4e1e__1500_6138.gif
I am assuming your exact bike is the one shown inn the above exploded view, as you have shown this view in an above post reply, correct?
The balance system has rubber "cylinders" that may act as a cush system for the balance weight.
The rocker arm pictures show black specks on the cam box floor, are they rubber i wonder, as you said you also replaced the cam chain tensioner?
Much bits of black rubber in the filter screen??
more to come......
https://images.cmsnl.com/img/partslists/honda-cbr125rs-2006-6-england-camshaftvalve_bigecpp4e1e__0300_a7bb.gif
The camshaft view does not show seperate cam bearings so they may be pressed/shrunk on, the end of the camshaft shows the cdi drive which may also be pressed or shrunk on, so as long as the shaft and bearings are ok, then leave alone probably......back in a moment.....
https://images.cmsnl.com/img/partslists/honda-cbr125rs-2006-6-england-cam-chaintensioner_bigecpp4e1e__0400_761f.gif
Correction, the bit on the end is just for the cam sprocket by the looks of..........
Those alloy "shavings", where could they come from?
Well from something made from alloy.........but the caged big end may well have a alloy ( or more exotic material ) cage??
more to come......
Correction....
"It's a 2007 RW6 (the carb version).".............turns out its a different bike to the views shown, slightly different animal, see crank view........
https://images.cmsnl.com/img/partslists/honda-cbr125rw-2007-7-england-throttle-body_big00028239e__1801_5199.gif
funny looking carb to me..........inj ____________________ nuts about bikes
Last edited by bikenut on 13:31 - 05 Dec 2019; edited 9 times in total |
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bikenut |
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bikenut World Chat Champion
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Posted: 12:36 - 05 Dec 2019 Post subject: bits |
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"I still have 2 X TZR250's and a TDR250. I also used to have another TZR250 race bike and have rebuilt them many times.
They all have roller small end bearings, as has every other Yamaha and Honda 2 stroke I've ever refreshed, from DT50MX, MBX50, NSR125's to DT-E125."
"It's a new one to me."
We all live and learn, remember " Look and Learn" ( showing my age now ) , Look and Learn with the aid of cmsnl, its free!
There are other flavours of parts suppliers out there with exploded views, but i find cmsnl more practical as they list stuff like outboard motors, genies, agri machines etc.etc.etc., all in one place.
Make sure you are sitting down when you see the prices mind, but you don't have to buy from them ( i have in the past and still will in the future, eu dependent ).
No roller little end bearing is common practice in the 4 stroke world. Some have interference fit of gudgeon pin in rod eye, some have a pinch bolt arrangement, and there are other methods. ____________________ nuts about bikes |
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Ayrton |
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Ayrton World Chat Champion
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Pete. |
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Pete. Super Spammer
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Ayrton |
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Ayrton World Chat Champion
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stevo as b4 |
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stevo as b4 World Chat Champion
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mattsprattuk |
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mattsprattuk Super Spammer
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Posted: 03:42 - 06 Dec 2019 Post subject: |
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Well isn't this fun.
Let's clear up a few things.
It's a plain bearing little end. No bearing cage
If you've removed your rockers, then head removal is only 2 bolts away (those 2x M6 ones in the cam chain tunnel). That's it.
I personally wouldn't bother replacing the head gasket as it's a stamped steel one.
My money is on worn rockers causing massive valve gap. Readjust and try again. If it's quiet. Replace the rockers ____________________ Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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Sister Sledge |
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Sister Sledge World Chat Champion
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Ayrton |
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Ayrton World Chat Champion
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Posted: 23:42 - 03 Jan 2020 Post subject: |
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Ok thought I would update this with what I found since it may entertain someone
Still unable to convince my brother to take the damn engine out and strip it down he fucked around with the cam chain tensioner and found the noise went away at idle if a longer one was inserted (the old one with something welded to it).
Must be a slack chain or worn guides so we whipped the tensioner guide out and it looked like this. I probably should have seen this when the head was off so I dont know how it was missed.
https://i.imgur.com/CoXVxi5.jpg
So new one of those and a chain was fitted but it still made a noise, this time it sounds less of a clicking sound and more chain rattle however.
Must be the other static chain guide I said, but he said he checked it and it looked ok Took the head back off and actually took it out this time and it's got some deep scratches and grooves, but not as much as the other one. It looks more like the chain has been running up the side of it though.
https://i.imgur.com/1BoI5BY.jpg
I'll keep the thread updated when a new one arrives. I just want to thank everyone for taking the time to help even when I haven't made it easy I can see why stripping the engine apart would have shown this stuff within 30 minutes but my brother has just been trying to cut corners to save time. He's learnt better now hopefully. |
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steve the grease |
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steve the grease Crazy Courier
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Easy-X |
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Easy-X Super Spammer
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Ayrton |
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Ayrton World Chat Champion
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Easy-X Super Spammer
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Posted: 16:50 - 09 Jan 2020 Post subject: |
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Best of luck ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Ayrton World Chat Champion
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Riejufixing |
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Riejufixing World Chat Champion
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Ayrton |
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Ayrton World Chat Champion
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Old Thread Alert!
The last post was made 4 years, 99 days ago. Instead of replying here, would creating a new thread be more useful? |
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