bsr65
High Number
Posts: 114
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Post by bsr65 on Mar 14, 2012 16:24:50 GMT
looking for advice on a clutch / cushdrive fault on my px125 disc, symptoms are when first starting bike then putting in first it jumps forward and stalls, after that ok ,no drag at lights etc. gear change is difficult, ive been through clutch and all seems well, another symptom is when the bike is being driven is the clutch lever slackens when throttle is open and tightens when throttle is closed. with the clutch removed the cush drive plates are not flush with the the gear(in the space between the rivots) im thinking maybe the cush drive is goosed, what ever is causing the lever to slacken is the problem but what is causing it. ANYONE ?
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Post by sbwnik on Mar 14, 2012 19:09:42 GMT
Springs are shot?
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Post by Rudi on Mar 15, 2012 21:38:38 GMT
Doesnt sound like the cush drive but rather sth to do with the clutch disengagement .
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bsr65
High Number
Posts: 114
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Post by bsr65 on Mar 16, 2012 9:27:39 GMT
cheers for replys guys, when i got this bike it had been sitting in a shed for years, i got it home then realised the clutch oil seal was nacked, I stripped down and replaced the crank seals and every thing looked good, but the problem which felt like the clutch persisted. ive replaced all clutch parts apart from the gear, cover and spacer/autolube drive. Ive also fitted a sip spacer, all this improved things slightly and ive just driven it as apart from the problem it is reliable but a pain to drive, any way ive put a p200 lump in an the 125 is sitting on my garage floor. im thinking if there is no give in the cush drive would that cause the clutch lever to go slack with the throttle open. Rudi ive seen motors with a nacked cush drive in the past and my symptoms are differant, ill get round to stripping the motor and ill let you know if i find anything. cheers again
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Post by sbwnik on Mar 17, 2012 22:02:30 GMT
Are you using new clutch plates? There are an awfl lot that are a mm or two too thick and they cause creeping proplems. The only thing I can thing of in the lever drift is that it may be related to the common problem with P ranges where the crank drifts left to right slightly when the clutch is used.
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bsr65
High Number
Posts: 114
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Post by bsr65 on Mar 18, 2012 19:27:06 GMT
thats the strange thing, on first start up the bike jumps forward and stalls then no creeping, plates were one's i had bought from old taffspeed shop so should be decent quality. Interesting point on the crank, to be looked at more closely. cheers
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Post by sbwnik on Mar 18, 2012 21:46:28 GMT
The crank does it on it's own, I've never cured it on any engine! Sometimes you get an engine with no drift, my P2 has has about 2mm of drift since brand new.
Take the clutch plates out and see if they'll fit in the jaws of a 17mm spanner. If not, they need skimming or (ideally) the basket needs the cutaways milling slightly.
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Post by colin4255 on Mar 19, 2012 12:52:26 GMT
I had lurching forwatrd on every use of the clutch from a dead stop. Fitted a new clutch, not much better. Took new clutch out and filed down slightly, the cutaways in the basket to allow you to drop each plate in and have it fall to bottom without catching and hey presto - clutch fine again. Unlike buying car parts, a lot of brand new scooter parts are just crap. No getting away from it. Maybe just a little filing and smoothing is all it will take. Make sure the plates are all flat of course cos if any are warped, it will cause the same lurching. Not sure about the cable slack - never seen that before, but witha Vespa, nothing would surprise me.
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