Have Eric Gorr port the cylinder for your style of riding. He can also fix the head to keep the motor from detonating.
His prices are very reasonable.His porting will cost less than a IT crank.
You may want to try the ignition coil from Black Ops Moto .It really cranks out a big blue arc to help the motor pull right off the bottom. With it and one or 2 more teeth on the counter shaft I can't see you needing more than that