Kdx 400 project

I don’t even know where to start with this issue so here it is. My kdx has been doing this funny thing where it starts to sputter like a fouled plug or as if it running out of gas and if i let off the throttle it dies but if i keep it pinned it catches itself eventually. The funny part about it is it when it happens it doesn’t keep doing it after it happens it rides the rest if the day fine. I recently spilt the cases and replaced seals and crank bearings with 0 leaks and it has max advanced timing but no pinging or detonation. Im going to try to set the timing to stock but i do think it was the issue because it just started doing this when it got cold here.

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