I thought I would add my 2 cents to this thread. I recently purchased a kawi T7 motor that was reported to be a factory race motor. It definitely had some unusual mods, most extreme was intakes that accept 44 mm carbs. One other mod was removal of the oil injection - it runs mixed gas. They drilled ...

I have a 80 liquifire, 79 invader and 80 4/6 engines apart in my garage. The liquifire and 4/6 pistons are nearly identical - same rings, pin position, weight, domes. The invader pistons have diff pin position, rings. The stampings between liquifire and 4/6 are different, and the only physical diff ...