Techno J, take no notice of this lot, it's quite easy. I did it to my little 175 twin years ago with nothing more than a hack saw and file to remove the surplus and a couple of digital bathroom scales to ballance it.
I put the bike over the measured flying kilometer at 156mph, well over the world record.
The motor was as smooth as silk and reved way above its previous best of 1400rpm and peaked at 1800rpm.
When I shut it down, there was a loud explosion, I thought the nitro had caused it to hydraulic.
The crank some how blew out of the motor side ways and was never found.
A few days later I received a letter from a ladies lawer demanding compensation for the damage to the roof of her house 3 miles away.
Seems the crank with 2 bits of con rods struck a glancing blow to her roof then vanished without trace.
A month later, I received letters from the European Space Agency and NASA wantng to know what the hell I had put into orbit around Pluto and would I like a Job with them.
I told them it was just my crankshaft and it was just an accident.
Three days later I got a letter from the International Space Agency demanding £59 billion for damages to the solar panels on the International Space station which the crank had clipped on its way out of the Earths orbit.
Although it can be done with few tools, I would leave it to the likes of Jay at APE.
If anything goes wrong like it did for me, you can at least blame it on Jay.
One thing to bare in mind though, they don't call him BIG JAY for nothing.
Sam.