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Discussion Starter #1
Hi,

I have an 01 TRX400 with a random missfire problem. The engine will run fine on choke, but when idling without choke it will randomly missfire, the engine will either almost die or completely die sometimes. When it's not missfireing it runs well and has plenty of power when revved up. It seems like it's electrical and not getting spark randomly.

Here is what I have done so far around this issue. Top end was redone, valves re-set, new plug, new voltage regulator, carb rebuilt 3 times. I'm not sure what to dig into next.... I've had this issue for the past couple years and I've just lived with it, but it would be nice to fix it and have a quad that can reliably idle. I'll try to upload a video of it running in the next couple days.
 
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