February 19, 200917 yr Guys, has anyone had a hesitation when their bike gets warm? The bike starts fine. Easy infact. As i ride around the yard for balance practice the bike develops a hesitation and lumpy idle just as the fan is kicking in. A slight snap of the throttle has the bike slowly pick up ...and on the way back down to idle the bike will easly stall. I don't even rev the bike past 1/4 throttle. There is no missfire at low or high revs. It doesn't go away until the bike cools down. I have two plugs and changing between the two makes no difference. I have tried the fuel mix screw 2, 3, & 4 turns out. I have drained the tank and flushed it out. The carb has been stripped, remove jets (standard), blown out and inspected 3 or 4 times. Float height is set to 13mm. I have a new fuel filter fitted. Any thoughts?... and thanks in advance. Ralph
February 19, 200917 yr Hello NZRalphy, I had also the problems, that my REV 4 went out after some time. Also it doesn't rev very high and it stuttered. The reason i found, was that the ventilation of the tank-cap didn't work. Open the tank-cap a little bit (to let air in) and try it again. German Munster Edited February 19, 200917 yr by German Munster
February 19, 200917 yr Author Hi Munster. Yes i have tried the bike with the fuel cap loosened. It made no difference.
February 19, 200917 yr I had this problem, cured it by backing the mixture screw out 4 turns from stop, it's located front center under carb, they do make a tool to do the job, I made my own and used a little mirror to make sure I was getting the turns correct. I think the stock setting is 1 1/2 turn out. I also found it didn't stall as easy. When I called JL; they rocomended stock pilot, 112 main, mixture screw 4 1/4 turns out, fully lift needle clip on bottom setting.
February 19, 200917 yr Gday, have you checked your valve clearances? One tight one will do that. Cheers, Stork
February 20, 200917 yr Author Nice one Stork. I'll check that as i adjusted the valves a few weeks back. I have jetting changes this weekend - will report.
February 22, 200917 yr Author The jettings changes done, as above, and all is well now. Because the fuel screw is now 4 turns out it really is rich at idle and just above. No choke needed now! I'll get onto valve checking/adjustment this week.
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