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VZ Alloytec Running Rough + Maxing at 4000rpm

ONROADYNO

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Hi, I have a VZ that has just started running rough when first started and goes away after a short drive. I just changed the fuel filter and same problem. I though I would rev it up in N and P and it will only go to 4000rpm. Thanks in advance
 

Big Red VF-SII Go-kart

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I though I would rev it up in N and P and it will only go to 4000rpm

The engine's anti-abuse program prohibits forced idling above 4,000rpm, which isn't a good idea (forced high idling) for any engine really.
 
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