March 8, 200719 yr Hi, I have an '03 2.9 in great condition. New to trials but not bikes. I am happy with the bike, but want to kill off some power in the short term. I have a slow action throttle on order (yes - I live in Australia) but would also like to tame the motor output. The bike is used at sea level. Max air temp would get to 30C and lowest, say 15C. Humidty rises with the temp here. If you could point me in the right direction of: 1. Carburettor changes 2. Timing changes 3. Gearing changes Thanks in advance. J.
March 8, 200719 yr http://www.sherco-moto.com/downloads/wayne...iming_Guide.pdf This should help with the timing
March 9, 200719 yr The info on the site is great, but to simplify matters and without using a timing guage, just rotate the backing plate 6mm to the left(counter) for good smoothing, half that to mellow just a bit! Your bike probably already has a "tic" mark on the right side of the top web casting edge. Gearing changes are not normally neccessary. Boyesen reeds are normally smoother off the bottom. Carb changes are not normally required if jetted properly. 33-36 on the pilot jet and 118-122 on the main for most. Your mileage may vary! ALWAYS check your air filter and airbox after washing the bike and prior to starting! It is critical! OR just remove the tank and mudguard before a wash, cover or remove the filter and plug the hole with a rag or towel to prevent water entry to airbox! This may be the last time I tell this! Edited March 9, 200719 yr by copemech
March 9, 200719 yr Author The info on the site is great, but to simplify matters and without using a timing guage, just rotate the backing plate 6mm to the left(counter) for good smoothing, half that to mellow just a bit! Your bike probably already has a "tic" mark on the right side of the top web casting edge. Gearing changes are not normally neccessary. Boyesen reeds are normally smoother off the bottom. Carb changes are not normally required if jetted properly. 33-36 on the pilot jet and 118-122 on the main for most. Your mileage may vary! ALWAYS check your air filter and airbox after washing the bike and prior to starting! It is critical! OR just remove the tank and mudguard before a wash, cover or remove the filter and plug the hole with a rag or towel to prevent water entry to airbox! This may be the last time I tell this! Copemech...this is just what I was looking for! So 6mm rotation will kill it off a bit and say 3mm will mellow it out. I will go with 3mm and move up to 6mm I suspect. 8-). I'll check out the carb set-up after I have don ethis and report back. Many thanks once again. I appreciate it. J.
March 10, 200719 yr I should probably add the fact that it IS a 2.9 and you can only mellow it soo much, and still run properly! My '03 was a POWERHOUSE! Hang on tight! See how it goes for you, there are other tricks, normally not needed! MC
March 10, 200719 yr I think the guy who had that bike before me put Viagra in the fuel tank because the thing had a permanant woody! He only rode the thing twice from new and wrenched his knee, could not ride for months! Word has it that same bloke has taken up 4T trials and has continued destroying body parts!
March 10, 200719 yr Sounds like you got a good deal !! I know the guy that had it, he put a little love into that one. I hear the same thing on the poor guy, keeps tearing up body parts. But he is like a timex. Rumor has it the Scorpa 4t he has runs strong and has a Beta 4t on the way.
March 11, 200719 yr Now then ktm my advice to would be dont do any thing with the timing etc until you have tried the slow trottle i have owned an 03 290 from new and i made the mistake of backing the timming off to soften the power, this does affect the bikes top end peformance. When i had mine backed off it wouldn't pull fourth gear for big climbs etc, try it with the slow trottle first you will be amazed at the difference that it will make.
March 11, 200719 yr I have tried both options of the standard ignition setting with the slow throttle and retarded ignition with standard throttle. I also tried changing the gearing as well but each to his own preferences I suppose but the retarded ignition with the standard throttle was the best option for me. It softened the power and gave me time to pick my lines and find bags of grip. Not sure of the actual ignition settings as the dealer carried it out for me but the difference was amazing, I was seriously considering selling my bike before a I could not get it to grip in wet and muddy conditions, however the power of the bike is now perfect for me, so much so that I am about to change to an 07 model. I will not hesitate to slightly alter the ignition as well if needed as the difference really was awesome. Edited March 11, 200719 yr by scudo
March 13, 200719 yr Author At the weekend I hope to get into the iginition and fiddle with it. I will add the slow action throttle when it turns up.....but BTW, what is a DELAY throttle assembly? what is it used for? etc?? I also notice BVM have an ADJUSTABLE throttle assembly which I presume limits the rotation, but don;t really know.... cheers J ...
March 13, 200719 yr I also have a new/used 03 2.9. I am ready to add the slow throttle I just bought, but have a question. What do I need to use for lube between the throttle and handlebar? Do I need to lube the inside too?
March 13, 200719 yr Chader, A small bottle of Dr Johnsons sex lube will last you a lifetime, the oily type, not the water soluable! Clean it regularly and re apply, specially if it has been circumcised by using bar ends which allow dirt entry! The throttle is a very important part and should work properly, so treat it as if it is a part of you! A light coating of spit or gear oil will do in a pinch!
March 13, 200719 yr So 3-in-1 or a light cable lube then? Cool, I was guessing any type of grease would be too thick. I'm just waiting on my new carb jets to show and I should be able to get my first real ride in this weekend. Thanks for the info.
March 14, 200719 yr Author To get the throttle grips on I use hairspray, then wire in place. Do the job a few days before you need the bike and the grips will slide on fine, then the hairspray dries out over a few days and acts as a fine glue. To lube the throttle tube between the bars and the plastic tube I use graphite powder. Doesn't pick up fine dirt but keep the whole assembly working nicely. Make sure you cove rthe bike a bit when puffing the powder in there. Thanks for the advice on taming the thing...
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