Our RMX is cutting out, but only on long long pulls at the sand dunes, it does fine at the track and on the trails.
Here are the specs:
It is a 91 RMX250, with a 94 Eric Gorr RM 265 cylinder, with a RM head that has been modified for the cylinder.
The bike has a fresh topend and reeds, etc.
At first I thought that the petcock was starving the engine for fuel, but I took it off to see how fast it would flow, and it seems to be plenty fast, so I don't think that is the problem any more.
What else could it be? Weird air leak? Cooling (The hose coming out of the top of the head is a little pinched by the gas tank.) Float level?
I have tried richening the jets, and it really doesn't help any.
Right now I'm leaning towards cooling or fuel starvation because it runs awesome everywhere until it bogs out.
Any suggestions would be appreciated!