trialssport Posted July 26, 2016 Report Share Posted July 26, 2016 After a shocking ride at a recent 2 day trial i have decided to try and get the TY sorted ! The problem is the engine takes ages to rev up its very very flat at top end ,if i hold the throttle wide open and let it rev its nuts off it seems to clear itself after about 10 seconds but then runs crap straight after .Bottom end power seems really good and loads of torque Things i have done so far 1) Stripped carb cleaned out and replaced little o'ring on main jet. 2) Replaced main seals on crank 3) Tried altering ignition timing 4) Altered main jet height for less fuel (plug was black) Any help with this problem would be very appreciated !! Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted July 26, 2016 Report Share Posted July 26, 2016 Have you got good flow of air through the filter then on to the carb? Quote Link to comment Share on other sites More sharing options...
slack Posted July 26, 2016 Report Share Posted July 26, 2016 Hi trialssport Have you checked the exhaust as they block up in the middle section i had one a few years ago that had your symptoms and when i removed the outer skin the centre box was almost closed with all the build up of excess oil and carbon. Try taking the exhaust off and start the bike and see if it revs any better.Also try taking the seat unit off and running it to see if that is restricting the air flow like 2stroke4stroke suggested.Do you oil your filter as i was advised not to to help air flow. 1 Quote Link to comment Share on other sites More sharing options...
andy m Posted July 26, 2016 Report Share Posted July 26, 2016 Loosen the exhaust at the barrel , let it blow and see if it improves a bit. If so then blocked exhaust . 3 Quote Link to comment Share on other sites More sharing options...
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