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Does anyone know what model cmb 21 this power head is and what type of pipe?

Well my k&b crank decided it was time to let go to day, when it stopped instantly I knew something had let go, I was expecting to find a broken con rod. Only parts that are useable is the top housing and pto

After a set of k&b 3.5 lower halfs and a tuned pipe

After a crankshaft for an .82 k&b inboard, or would consider a complete motor

What would need doing to a k&b 3.5 on a hot shot to get it over 70km/h (45mph)? Ive got a power head that has an ex throttle and when I opened it up it looks like someone has done a few mods

Im after a 3.5 power head and a 7.5 or bigger power head

As per title, Cheers