Topic: CB550 Race Piston Kit?

[Bro J Simpson]

I've noticed quite a few people have installed the dynoman piston kits, and it seems to mostly be the kit that comes with 358a or 358b cam. i was just wondering if anyone has had any experiences with the "stage 3" race piston kit. I'm very interested in giving my 550 some extra power.

Thanks!

[turboguzzi]

how much compression does the stage 3 have and where do you use the bike?

wouldn't want to run more than 11:1 on a street bike, for racing 12:1 or even more is fine though (assuming you know how to set it up in terms of squsih and valve to piston clearance)

[Bro J Simpson]

the stage 3 is 11:1 i believe. i ride on the street. a friend of mine and i like to ride around some twisty back roads. i honestly don't know much about hot rodding motors but i'm trying to learn. i've been reading about the cb650 head/550 swap with the 750 pistons. there's just a lot to take in.

[FunJimmy]

Dynoman sells three different 592cc (61mm) piton kits for the 550.
Two of the options run 10.5:1 CR and the Race kit is 11.5:1 CR.
The most common kit is the DP592/61s also packaged with the stage II engine kit.
Several members are using this piston with good results. I will be soon to.

There is also a special piston for 550's running the 650 head. Might be the way to go if you can find a nice header.

Caio

[Bro J Simpson]

Thanks for the replies! I'm heavily considering the DP592/61s. I guess i was just curious if the increased compression from the race kit is worth the extra $$.