Home Forums TaG Rotax Max Help! Sr. Engine doesn't rev past 12,500 (upgraded to EVO) Reply To: Help! Sr. Engine doesn't rev past 12,500 (upgraded to EVO)


andy graham

there are several issues that cause the ecu to limit at 12500…see if you can download the manual and it will guide you through a bunch of trouble shooting…I’d almost bet money that you have the gasket between the cylinder and powervalve housing on upside down…theres a hole in the gasket that has to align with the hole in the housing and the cylinder, that’s the pressure feed for the power valve…if its blocked off, the power valve wont work and you’ll limit at 12500…the new power valve has a ground wire thats attached or unattached to change the rpms at where it opens, might want to chase that also…easy to check the PV gasket though and rule that out hopefully


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