scifi Posted March 13, 2018 Report Share Posted March 13, 2018 Is the twist-grip free to rotate, or is there any mud under the grip..? If you release the twist-grip it should snap back to idle, and you should hear a 'clonk' from the slide in the carb. . Quote Link to comment Share on other sites More sharing options...
mattmahon10 Posted March 13, 2018 Author Report Share Posted March 13, 2018 11 hours ago, scifi said: Is the twist-grip free to rotate, or is there any mud under the grip..? If you release the twist-grip it should snap back to idle, and you should hear a 'clonk' from the slide in the carb. . Yeah I can hear the clonk back at the carb. After reading this ive stripped the throttle twist grip and cleaned it all up. It hasnt solved the main problem but least i can rule that one out. Quote Link to comment Share on other sites More sharing options...
mattmahon10 Posted March 16, 2018 Author Report Share Posted March 16, 2018 Hi all, The saga continues unfortunately. Ive removed the flywheel and renewed the crankshaft seal and then tried it without and with the flywheel weight to see if it makes any difference. Unfortunately the bike is still taking way too long to return to idle after giving it some revs (Trying this all in neutral). Im toying with the ideal of just swapping the whole carb out to see if that'll make any difference. Probably a like for like mikuni. Again im all out of ideas Quote Link to comment Share on other sites More sharing options...
scifi Posted March 16, 2018 Report Share Posted March 16, 2018 Maybe you are just trying to be too good. As you say you are trying it in neutral, it will be completely different in a section, where there is some resistance to overcome. At the moment there is no resistance, so if your engine is well run-in there is very little friction to slow the flywheels. What are you expecting to slow the rotation down..? . Quote Link to comment Share on other sites More sharing options...
mattmahon10 Posted March 16, 2018 Author Report Share Posted March 16, 2018 On 3/9/2018 at 9:27 PM, thall1 said: its probably running too lean.... just richen up the bottom end a little at a time and see if it helps.... the air screw doesnt seem to adjust much at all. Im running a 150 jet, would you recommend changing a jet? if so which one and size? Quote Link to comment Share on other sites More sharing options...
mattmahon10 Posted March 16, 2018 Author Report Share Posted March 16, 2018 31 minutes ago, scifi said: Maybe you are just trying to be too good. As you say you are trying it in neutral, it will be completely different in a section, where there is some resistance to overcome. At the moment there is no resistance, so if your engine is well run-in there is very little friction to slow the flywheels. What are you expecting to slow the rotation down..? . I will post a video of the issue tomorrow. And ill let you tell me if im overreacting because as i say i dont really know how these things are meant to run. Ive always been a road biker Quote Link to comment Share on other sites More sharing options...
scifi Posted March 17, 2018 Report Share Posted March 17, 2018 (edited) Hi Matt, look forward to your video. I think it might slow down quick enough, if you shut the throttle when going up a long hill. . Edited March 17, 2018 by scifi Quote Link to comment Share on other sites More sharing options...
mattmahon10 Posted March 18, 2018 Author Report Share Posted March 18, 2018 Rev 3 Slow to return to idle help There you go guys. Please let me know if thats returning to idle as it should. sorry it was so short it I only had time to do this later in the evening. Quote Link to comment Share on other sites More sharing options...
maxwell smart Posted March 19, 2018 Report Share Posted March 19, 2018 (edited) have u pulled the slide and checked that the needle is held from moving up. I think u are getting extra fuel not air causing the run on Edited March 19, 2018 by maxwell smart Quote Link to comment Share on other sites More sharing options...
thall1 Posted March 19, 2018 Report Share Posted March 19, 2018 If your adjusting the mixture screw around the position it is now and it's not doing much then it's probably wound too far out to have any effect on idle. Try adjusting the mixture screw in (or out depending if it's an air of fuel screw) until the revs reach their highest then adjust the tick over back to where you want it Quote Link to comment Share on other sites More sharing options...
maxwell smart Posted March 19, 2018 Report Share Posted March 19, 2018 the idle mixture screw will have no effect because the engine is running rich from the main jet bleeding a small amount of fuel. when u pull the throttle u move the needle out of the main jet. and the engine runs on a combination of the idle circuit and the main circuit. when the throttle is released the needle jet has to fully plug the main jet or the engine will display all the symptoms u are talking about. because its running partly on the main with the needle jet not positively held u can never tune the carb. Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted March 19, 2018 Report Share Posted March 19, 2018 (edited) Sounds to me like you have a rather fast tickover anyway (if that is it reaching tickover before you blip it). Try adjustng it down on the throttle stop screw then see if you still think it is a problem. Edited March 19, 2018 by 2stroke4stroke Quote Link to comment Share on other sites More sharing options...
b40rt Posted March 19, 2018 Report Share Posted March 19, 2018 Primary circuit blockage causing it to run lean. IMO Quote Link to comment Share on other sites More sharing options...
mattmahon10 Posted March 19, 2018 Author Report Share Posted March 19, 2018 17 minutes ago, b40rt said: Primary circuit blockage causing it to run lean. IMO Where would i check this? Quote Link to comment Share on other sites More sharing options...
b40rt Posted March 19, 2018 Report Share Posted March 19, 2018 2 minutes ago, mattmahon10 said: Where would i check this? Blast carb cleaner through every orifi, in every direction. Strip carb right down anx remove petrol/air screw and pay particular attention here. Quote Link to comment Share on other sites More sharing options...
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