the stroke is the same on the outty 800 and outty 650, the outty 800 has a 9mm bigger bore though

and the outty 650 is just a stroker 500, they have the same bore but the stroke is 15mm longer on the outty 650

specs

outty800-bore:91 stroke:62
outty650-bore:82 stroke:62
outty500-bore:82 stroke:47

and the outty 400 is just an outty 800 with one cylinder


ps: why is the outty 800 lighter than the outty 650 and about the same weight as the 500. I think the 650 and 500 officially suck compared to the 800 (unless you get a big bore kit for the 650 that is cheaper than the 800)

 

The 800 has aluminum wheels. The 650 and 500 have steel. The 500 may save some weight with the struts on the front end.

Jaybee