YFZ 450r timing issue , NEED HELP! - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
 
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post #1 of 4 (permalink) Old 08-31-2019, 01:35 AM Thread Starter
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YFZ 450r timing issue , NEED HELP!

2012 Yfz bought used, with pipe and air box, with wiseco programmer, running fine one day , then started acting like the tip sensor activated, missing and bogging and would only idle for a few seconds,, replaced with KMS eliminator , nothing helped, new fuel injector, fuel pump assembly, TPS, checked stator, crank position trigger, checked timing, replaced plug, checked valves, ......... I AM AT MY WITS END, even paid an Atv shop a lot of money to only have them scratch there heads...help please. I can keep it running now while working the throttle and with only the MSD BOX on that I also replaced along with a new CDI box, crazy ,
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post #2 of 4 (permalink) Old 08-31-2019, 02:50 PM
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Have you checked both the coil itself and also to make sure it’s staying on the spark plug? Mine started coming off in the middle of a race and started causing all sorts of issues.

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post #3 of 4 (permalink) Old 10-12-2019, 10:19 AM
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Thanks for the information.
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post #4 of 4 (permalink) Old 10-21-2019, 01:33 AM Thread Starter
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Just a follow up, the fuel injector boot seal, was put on incorrectly, geez!
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