Well if the gasket isn't working properly the exhaust won't pressurise the fuel properly therefore getting a bad fuel supple to the engine....
I got some ansman gaskets from the LHS which were much cheaper then hpi's
Engine runs fine, had it in the trophy but not tried it yet in the savage. Put a pullstart on it cause like u the rotor start killed the battery after one attempt. Maybe thats why there's a rotor start 2 that hpi brought out.....