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Changing the existing muffler or adding another muffler after the existing one will change engine back pressure and affect engine performance.

There were almost 30 thousand MEP831's produced by Fermont, they are now being produced by Fidelity corp. Small sets are never going to go away, they are the work horse of the military and they beat the snot out of them. You can run the 3kW without variable speed, just remember the engine has a...

Go by the TM, these engines were set up differently by Yanmar for this use.