I'd suspect there is a sensor that either is out of spec or send the wrong signal in certain conditions . have you ever taken one or both sparkplugs out and see if they're sparking or if they're wet or dry ? That will give some idea as to which side of the problem to look at - spark or fuel . Do you here the fuel pump building pressure ?
maybe twist the throttle backwards while attempting to start , trying to close the throttle harder and then see if it starts . There can be sensors reading the throttle is open if cables are tight thus the ecu won't send a spark , however , if your one pipe seems to be getting warm it many suggest there is spark, just not fuel or too much and it's flooded badly (the reason I want to know if plugs are wet or dry ).
One other thing to try , turn key on , twist throttle to half while cranking, pause then go wide open all the while cranking, doing all this in a span of 4 seconds . This would be an attempt to clear unburnt fuel . If the bike is getting flooded , i'd swap the plugs to the Iradiums . I have them in just about everything nowadays , not for any perceived performance gain but soley because they will not foul and will spark covered in oil or fuel where std plugs short out at any little covering .
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'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
Last edited by jjrider; 25 Oct 2018 at 02:58.
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