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Discussion Starter · #1 ·
I recently had my Raptor 700 engine rebuilt, 5mm Hotrods crank, stage 3 hot cam, 780cc piston and cylinder, HMF exhaust and HMF optimizer... i put the engine back in, and it fired up with no issue, while on a short test ride, the engine would hesitate or sputter when i was on the throttle, seems like a fuel issue to me.. im looking for some helpful advice or tips from people who have experience with big bore builds please!!
 

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the optimizer doesn't learn by itself like a car does. If it hasn't been custom tuned with an air fuel meter attached, there lies your issue.
 
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