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Post by raven13 on Apr 7, 2013 13:16:41 GMT 1
I've come to the conclusion that i need someone with more knowledge and experience to have a look at the mk3.
no matter what i do i cant get it running right.
so this is a shout out for help.
anyone that can help me figure out wtf is going on.
ive got to the point where im thinking the cdi unit is faulty.
everything else has been stripped, cleaned,stripped again and checked.
so please please please guys i need HELP
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Post by looey on Apr 7, 2013 13:57:27 GMT 1
Is there another post somewhere that says what your running problems are and what your current setup is ?
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Post by raven13 on Apr 7, 2013 14:17:54 GMT 1
MK3 125lc working power valve +1mm on the bore, standard exhaust. standard jets.
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Post by looey on Apr 8, 2013 8:38:33 GMT 1
And what are the running problems/symptoms ?.
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Post by raven13 on Apr 8, 2013 18:07:53 GMT 1
hard to start, wen it does it wont run on anything less than half throttle. stalls out at will and then no matter what wont start again.
the carb has been reapeatedly stripped and cleaned, ive had the top end off and checked that. ive even tried the carb off my road bike and its always the same.
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Post by looey on Apr 8, 2013 18:30:22 GMT 1
Sounds like it could be electrical to me, maybe a weak output from the source coil.
If the spark is weak then they are hard to start but when the revs get up it starts producing a strong enough spark to run better
Had EXACTLY the same problems with a friends Suzuki X7 and after swapping out everything from a running bike, the stator was the last thing left. The complete stator assy was swapped out and it's run perfect ever since.
Just an idea if you haven't tried it already ?.
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Post by raven13 on Apr 8, 2013 18:53:28 GMT 1
new coil good spark, very good stator, i have honestly tried everything i can, thats why im begining to think its the cdi
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K8DTG
L plate rider.
Posts: 29
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Post by K8DTG on Apr 8, 2013 19:30:41 GMT 1
crank seals?
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Post by Yogi on Apr 8, 2013 19:37:03 GMT 1
Maybe some sort of air leak?
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Post by raven13 on Apr 8, 2013 19:40:57 GMT 1
not an air leak. it seals up tighter than a duck ar53.
how do i check crank seals??
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Post by Yogi on Apr 8, 2013 19:59:11 GMT 1
If the crank seals gone that would be an air leak into the gearbox? Was there any oil by the big end when you took the top end off?
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Post by noelrdlc on Apr 8, 2013 20:04:25 GMT 1
Had a similar problem with a mk3 ypvs a few years ago. For me it turned out that who ever rebuilt the engine, had put the wrong con rod on the crank shaft they had used one from a standard engine and the piston was not reaching the top of the barrel.
My bike ran all be it just about.But sounded similar to the problems your having
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Post by raven13 on Apr 8, 2013 20:24:52 GMT 1
its got a 1gm conrod think thats wat it said
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Post by noelrdlc on Apr 8, 2013 21:04:48 GMT 1
It would be worth while pulling the head of and double checking the piston is reaching the top of the barrel,
The ypvs con rod is longer.
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Post by billbott on Apr 9, 2013 7:19:58 GMT 1
Watching this post with baited breath.
My DT125LC YPVS wont start either and have checked everything time and time again.
I bought a second CDI and it was the same - yamaha mechanic told me that usually they either work or they dont, rarely intermittent.
The RD and DT CDI's are different otherwise I would send you my spare to try.
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Post by raven13 on Apr 9, 2013 20:30:07 GMT 1
come on guys i still need help.
what am i missing, what can i have forgoten?
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Post by looey on Apr 9, 2013 20:52:37 GMT 1
Have you tried replacements of everything from a running bike ?, that's normally the best way to check everything ?.
As suggested, did you whip the head off and make sure the piston is coming up to the correct TDC ?.
My Mk1 had a dodgy CDi last year (common on the Mk1, dunno about the later models ?) but it would run perfect most of the time then just miss a beat when ticking over occasionally or sometimes hesitate a bit on acceleration. Swappedthe CDi out and it's been perfect ever since
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Post by raven13 on Apr 9, 2013 21:19:00 GMT 1
hard enough to find bits as it is, getting my hands on a running bike to play donor with, not likely
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Post by noelrdlc on Apr 9, 2013 23:02:26 GMT 1
Check this video out this is your problem
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chez
Thrash Merchant
Posts: 336
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Post by chez on Apr 10, 2013 20:25:40 GMT 1
I have a mk3 cdi in mint condtion i bought it on here i never used it i gave £50 plus post if this is any good to you
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Post by raven13 on Apr 10, 2013 21:00:32 GMT 1
nope piston is at the top of barrel as it should be  |
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Post by raven13 on Apr 11, 2013 18:46:36 GMT 1
bump
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