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Post by jacknicholls on Aug 8, 2015 17:15:38 GMT
Hi all, New here and hoping for some help!  I'll try to be as brief and descriptive as possible. I've recently replaced the xmas tree on my Vespa PK 125 ELESTART XL. As you'll know, to do this is a pain and a lot of work!  I'm at the stage where there are now very minor things to be done to get the bike back on the road, or so I thought. When the spark plug is out, the flywheel turns perfectly every kick and I can get a nice spark. As soon as I put the spark plug in and kick down, the flywheel stops turning (turns every now and again but not enough to start the bike). I thought it might have been to do with the clutch cable so I loosened it and still no joy. I have tried to bump it and the result is exactly the same as trying to kickstart it. So, no plug in cylinder = kicks down beautifully and strong spark. Plug in cylinder = kicks down and comes back up no problem but flywheel doesn't spin.  I'm really hoping this is a minor thing to fix... Compression? Clutch? Cheers! |
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Post by henri on Aug 9, 2015 8:28:45 GMT
slipping clutch ,maybe , when you did the tree was it replaced with stock 1 ,or a drt short/rms 1 , an did you pull the clutch basket or leave in cases , does sound like clutch is slipping as soon as faced with a load from compression , did you replace the clutch plunger or disturb it ,maybe its turned in the case an pushing on clutch pressure plate ,either way think you'll have to get clutch case off an have a look . H
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Post by jacknicholls on Aug 9, 2015 12:08:49 GMT
Tree is stock and I did pull the clutch basket.
I'll take the clutch case off tomorrow and see what's going on!
Thanks for the advice!
Cheers!
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Post by kidda on Aug 9, 2015 12:55:34 GMT
Have you changed the kickstart cog?i had problems before my rebuild with the kickstart (exactly the same to an extent)then inspected the cog and the teeth had worn,replaced cog and all good now
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Post by henri on Aug 10, 2015 8:46:02 GMT
thats why i asked bout the tree kidda ,as drt/rms ones use different amounts of teeth , 10 or 11 if memory serves , am hoping its a clutch set-up thing as anything else is a cases split kind of deal, H
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Post by kidda on Aug 10, 2015 13:06:40 GMT
A up H hows it goin? I had the same kind of problem a bit ago if you remember vespa.proboards.com/thread/4925/1987-px125-start-slips-engine and it turned out to be the cog,when I stripped the engine you could see the top of the teeth had rounded off a touch, rekon it was due to the time I put the piston in the wrong way round and was trying start it like a crazy mofo kicking it like a mule haha, anyway H check this out we have got it going,whoop whoop,winner haha,nice one for the advice and that your a star,cheers mate av a gudun |
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Post by henri on Aug 10, 2015 14:05:59 GMT
soundin sweet there kidda ,hope you did the full "its alive" dance ,too many start up vids recent have had "sad dad" dancing ,no moonwalkin ,crotch grabs, n high pitched yelps ,engine builds have been good ,just let down by the dancin somewhat ,personal opinion of course .
got to my re-sprayed/re-built n mot-ready moment today on my spanish smallie , all downhill n sad from ere ,finished the fun now the selling n on to nxt 1 , H
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Post by vespasco on Aug 10, 2015 15:04:55 GMT
Could it be,
A woodruff key?
Flywheel side.
Take it for a ride.
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Post by jacknicholls on Aug 10, 2015 15:06:04 GMT
Cheers for the help guys! Appreciate it! The tree was standard and the cog was in good condition when putting engine back together. I replaced the Input shaft woodruff and also the clutch woodruff so hopefully not that. I've added a couple of videos for you too see what I'm dealing with. No plug
With plug
Fingers crossed its the clutch and thanks for the support henri. Bike sounds sweet as kidda, hopefully get mine on the road soon! |
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Post by vespasco on Aug 10, 2015 15:33:48 GMT
Ok,
From that we can see the crank is not spinning so its very likely the clutch side somewhere is at fault...or of course the kickstart is not engaging under compression.
Hooe you find the cause
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Post by kidda on Aug 10, 2015 22:31:25 GMT
I've just done the oh fuk dance H!!!!'got me cutdown out me shed and noticed back tyre flat so decided change the tube sort it,pile of bricks and wood later,wheel off and changing the tube on the patio,me dog Alfie decided come and give me a fuss and clipped me scooter,I've just watched it somersault off the patio and land on me garden!!!!!i would of had £250 off you been framed for that one!!!!dont believe it,new headlight required and a nice dent in the legshield,you gotta love staffies!!!!!oh well give me something else fix haha
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Post by henri on Aug 11, 2015 8:34:04 GMT
at least he didnt do my ones trick ,if ya kneel for more than 5 mins he reckons your permanent n need "marking/claiming" , usually gets ya in back of neck ,H
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