FYI..........The 420, 460, 540 flywheels are not interchangable.
The 420 & 460 are close, but no pickle...won't work.
Everything is much BIGGER on the 540..........the 420 & 540 share the same bore....(can use the same piston),but the 540 has a much longer stroke, making it a low end grunt monster, not so much on the top register. That counter weight weighs as much as a cinder block. Now if we can remove it and balance the crank, and get a billet flywheel.....ain't nuthin gonna touch this engine.
Now here's a question:.....when you drop an ARC Billet flywheel or other billet flywheel in, can you use the stock ingition coils?
I put one on a 460 and was told I had to change the coild to the briggs raptor coil.................dunno why........