Bart Markel's Iron XR race bike, now owned by Bob Butler.
The spark plug in the center (like a Hemi motor) is actually a good idea since it may allow the flame travel an easier route to ignite all the fuel, make a bigger explosion, thus more power - or more efficient power. This is why "dual plug heads" benefit the ironheads, with their high-dome pistons. The piston dome can block the flame travel. It's what I've read, and it makes sense.
The spark plug in the center (like a Hemi motor) is actually a good idea since it may allow the flame travel an easier route to ignite all the fuel, make a bigger explosion, thus more power - or more efficient power. This is why "dual plug heads" benefit the ironheads, with their high-dome pistons. The piston dome can block the flame travel. It's what I've read, and it makes sense.
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