the MF is the Mega MF . based on the LS or LL3, not quite sure. it is a novarossi engine, and does take the 7601 rod also.

to answer your PM, i change my rods after run in, and then after every meet i pull the engines down to inspect. there is no set time to change the rod, but generally should be looking at chaging it say every 6-8 lts of fuel. the more often one changes it the more life the engine will give you.