nzralphy Posted February 19, 2009 Report Share Posted February 19, 2009 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 Quote Link to comment Share on other sites More sharing options...
german munster Posted February 19, 2009 Report Share Posted February 19, 2009 (edited) 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, 2009 by German Munster Quote Link to comment Share on other sites More sharing options...
nzralphy Posted February 19, 2009 Author Report Share Posted February 19, 2009 Hi Munster. Yes i have tried the bike with the fuel cap loosened. It made no difference. Quote Link to comment Share on other sites More sharing options...
ishy Posted February 19, 2009 Report Share Posted February 19, 2009 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. Quote Link to comment Share on other sites More sharing options...
stork955 Posted February 19, 2009 Report Share Posted February 19, 2009 Gday, have you checked your valve clearances? One tight one will do that. Cheers, Stork Quote Link to comment Share on other sites More sharing options...
nzralphy Posted February 20, 2009 Author Report Share Posted February 20, 2009 Nice one Stork. I'll check that as i adjusted the valves a few weeks back. I have jetting changes this weekend - will report. Quote Link to comment Share on other sites More sharing options...
nzralphy Posted February 22, 2009 Author Report Share Posted February 22, 2009 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. Quote Link to comment Share on other sites More sharing options...
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