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Post by hendley on May 3, 2014 19:56:39 GMT 1
Has anyone got any ideas why my 31k power valve is giving me grief, one minute it's running fine and the next it won't rev and backfires, I have replaced everything but nothing works, I have put a brand new loom on 3 different stater plates 3 different cdi's all of working bikes a different coil different carbs different ignition, what the f+*k is going on Paul
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Post by Yogi on May 3, 2014 20:06:33 GMT 1
Could be petrol starvation, have you cleaned out the tap?
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Post by midlifecrisisrd on May 3, 2014 20:08:40 GMT 1
Has anyone got any ideas why my 31k power valve is giving me grief, one minute it's running fine and the next it won't rev and backfires, I have replaced everything but nothing works, I have put a brand new loom on 3 different stater plates 3 different cdi's all of working bikes a different coil different carbs different ignition, what the f+*k is going on Paul Had a dt do that. Check the float height and needle valves are not sticking. Swore it was electrical but was over fueling Steve |
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Post by Yogi on May 3, 2014 20:11:17 GMT 1
Has anyone got any ideas why my 31k power valve is giving me grief, one minute it's running fine and the next it won't rev and backfires, I have replaced everything but nothing works, I have put a brand new loom on 3 different stater plates 3 different cdi's all of working bikes a different coil different carbs different ignition, what the f+*k is going on Paul Had a dt do that. Check the float height and needle valves are not sticking. Swore it was electrical but was over fueling Steve Didn't suggest the carbs Steve cos he said he swapped them already |
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Post by looey on May 3, 2014 20:24:46 GMT 1
Have you checked the reed valve assemblies and gaskets etc. ?. I had a miss-fire on mine once under load and it turned out to be the reed valve assemblies drawing in air. Felt exactly like an electrical miss-fire, so took me a while to find  |
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Post by hendley on May 4, 2014 18:05:34 GMT 1
Hi forgot to mention on last message that when it decides to play up the spark disappears despite changing loom coil cdi stator multiple times also changed ignition and bypassed the cutout switch been out to it and won't start, half an hour later it starts, I have kept the bike in the exact position as not to disturb anything this is nuts
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redone
L plate rider.
Posts: 29
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Post by redone on May 4, 2014 20:32:44 GMT 1
watching with interest as after a short break ,2 years to get a divorce I pulled my lc ypvs out of the garage today to prep it for a mot and its pretty much doing the same as your. just hoping the cdi hasn't gone down as its the bain of this bike !!
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Post by hendley on May 5, 2014 12:24:47 GMT 1
Have tried 3 different cdi's one I took off a working bike and put back on working bike and watched it ride away, hope yours doesn't start doing the same , it's driving me to despair lol
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on May 5, 2014 12:36:32 GMT 1
Could be the pick up on the stator breaking down when it gets hot
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db8888
Thrash Merchant
Posts: 329
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Post by db8888 on May 5, 2014 12:57:05 GMT 1
Could be the pick up on the stator breaking down when it gets hot +1 |
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Post by stusco on May 5, 2014 13:36:50 GMT 1
Back in the day my lc2 low rev coils had a break in it ,took me months to find as it was intermittent ,no spark when happening got them rewound all great after that.
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Post by hampo on May 5, 2014 19:05:08 GMT 1
If the sidestand cutout switch is still there try bypassing it. Faulty one will kill sparks.
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horace
Thrash Merchant
Posts: 456
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Post by horace on May 5, 2014 19:47:11 GMT 1
Good call Hampo.
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Post by hendley on May 6, 2014 17:36:28 GMT 1
Hi tried 3 stator plates one of working bike that I borrowed even bought one and made no difference changed coil off my 4LO 350 still no joy basically have changed everything spark related and makes no difference
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Post by fatfastroger on May 6, 2014 19:09:12 GMT 1
I suffered the same on my LC2, did all the things you did and still not cured it. Decided to strip bike for paint and rebuild engine, so might have cured it with new crank seals, time will tell.
Check all your earth connections too, with all the parts you swapped it not sounding like an electrical fault though, so could be air leak ?
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Post by hendley on May 6, 2014 20:10:38 GMT 1
Hi after all I've changed, I had to rebuild the engine anyway and hoped that might of cured it especially after I found instant gasket on the head gasket, put it back in and it started first kick and sounded sweet thought I might of cured it then before long back to as it was before been researching some more and remember once checking for spark at the plug, the spark was orange which apparently. Doesn't make a difference even though I put the coil off my rd350lc and also the one off my rz250 ypvs I am going to try and get another coil to try . Anyone out there got a grab rail for an rd500 by any chance ? Paul
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Post by hendley on May 7, 2014 17:52:19 GMT 1
Hi yes it backfires from both sides and the exhaust gases are a dirty brown colour while it's doing this it won't rev either. Paul
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Post by hendley on May 10, 2014 9:30:15 GMT 1
Hi just rebuilt engine and all looks ok problem was there before and not improved at all but as I say when it decides not to start the sparks have gone.
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Post by bluebellc on May 22, 2014 18:09:51 GMT 1
Keen to know if you've got anywhere with this problem.
John.
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Post by hendley on May 22, 2014 18:17:46 GMT 1
Hi john, I'm stumped having changed everything numerous times don't know what else there is do look at. Paul
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