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I've got a 165cc bbk, stroker and V2 race head, so 176cc. Bike runs great, other than a surging idle when fully warmed up. It's not a vacuum-leak induced surge, and it's intermittent. I'm curious if maybe the engine is too big for the stock idle control circuit? It's getting annoying and I'm considering just disconnecting the IAC motor and setting the idle speed just with the throttle body screw.
The AFR is around 13:1 at idle.
Anyone else with an modded z have idle issues?
 
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