February 27, 200620 yr Hi all, Some of you regular Viewers(?)will know that i have been having problems with my sherco `04 290.The persisting problem is a that it doesnt rev cleanly at lower revs,and the tick over is a bit rough.Open the throttle she will pick up ,then eventually run smooth. I`ve put a new stator on,tried my mates coil,his carb and his fly wheel,different plugs.Nothing will cure it.Its also on super unleaded as recomended,with the correct oil mix.It does seem better with the choke on,so i played around with mixture screw....still the same What can be causing this Steve
February 27, 200620 yr strip the carb , sounds like it could be a blockage in the pilot jet. any which way the carb needs cleaning to eliminate it. and also check the reeds there may be a bit missing. Edited February 27, 200620 yr by paul w
February 27, 200620 yr If it runs better with the choke on that suggest to me you've got a air leak somewhere. Have you done a leak down test Leak down procedure Chris
February 28, 200620 yr I agree the pilot is probably just got a bit of gunk in it be careful not to bend the float tab or put floats in wrong a new plug seldom hurts and Shercos need an occasional road gear run until rear silencer shoots sparks for a while a nd smokes like crazy
February 28, 200620 yr Sorry to hear your still having problems, Exhaust isnt blocked or something really daft? in the unlikely event that it is something like that
February 28, 200620 yr if it runs better with choke then its almost certainly an air leak most likely any where in the carb to engine assembly rather than spend the rest of your life looking for it strip the lot down clean it up (gaskets and mountings) so they are perfect replace any suspect gasket/ rubbers and re assemble with care, if that doesnt cure it at least thats one more thing off the list
February 28, 200620 yr Mail me I may have a set of reeds somewhere, did you completely strip the carb, ie jets out and blown through?
February 28, 200620 yr If you say you have tried your mates carb and electrics then I think you must be looking at a reed problem or a crankcase air leak...Just trying to narrow things down will save you a lot of work and some sanity .(This is from experience, I know, these sort of faults can boil your ****)
February 28, 200620 yr Gutted for you mate, Hope it gets sorted soon, I've been there as you know and understand how god damned annoying it is to have a faulty bike you've only just bought.
February 28, 200620 yr Examine the the rubber bit[technical term]between the carb and engine for a hole or split that will allow air in,Does the plug come out a white/light grey colour signifying a weak mixture.I assume the jetting is correct,if so the mixture screw wants to be about 3 turns out.Good luck
February 28, 200620 yr Author i`ve been told that it could indeed be the crankseal on the ignition side.If the other side goes it apparently blows smoke out, or spits oil out of the breather.Its not doing any of these,so i am going to attemp changing the seal. Its quite a simple job i`m told,screw some self tappers into the seal,then draw it out.Then oil the new on up and ease it in. Is it really that simmple?has any of you boys done this job Cheers Steve
February 28, 200620 yr just done the crank seals on my scorpa and yes it is that simple once you`ve pulled the flywheel! may well need some special tools but when you get there the self tapping screw method is one I used and is very effective. Be carefull when putting the new seal in that it goes in straight/square
February 28, 200620 yr If you can have it running, spray some WD40 or water or something in the seal area in question. The engine should change sound up or down. Granted its easy to change the seal, but its nice to verify ahead of time that it is indeed a problem. kcj
February 28, 200620 yr Author Thanks for all the replys.I`l do the wd40 thing first.Hopefully thats where the problem might be,although i have visually checked this area before.If not then its got to be the seal. Watch this space! PS, nigel,Yes i completly stripped the carb and gave it the compressed air treatment.I`m as sure as i can be that the carb is not causing the problem,and cheers for the offer of the reeds,but i swapped them with the other bike so i know they are ok. Cheers Steve Edited February 28, 200620 yr by gasgasssser
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