Piston weights

[Brock]

A lot of people don't think about piston weight and the effect it has. Here's some examples of the 800's out there.
800 e tec , cat 800 and axys 800.

E tec 800

Axys 800

Cat 800.

Now, the poo and cat are 85mm vs the Doo at 82mm. The Doo piston is way to heavy in my opinion and it's smaller. Should be 50 grams lighter . The Polaris could be 30-40 grams lighter. The cat is OK were it's at.

The weight of the pistons has a lot to do with reliability, not just the tolerances. It's good to have a tighter (0.00525") tolerance when new for sure.

I'm just pointing this out

 

[racerdave]

On a similar note for those that build 660's with oem Polaris 700 pistons. A Wiseco piston pin is lighter than a oem pin. Using it with oem 700 pistons keeps you with a few grams of the original oem 600 piston and pin weight. Every little bit counts on these quick reving little big bores.

 

[Brock]

Yes , titanium wrist pins.
I've been using them since 2001 in the 800's. Saves 30 grams+

The new axys 800 ho is a great made piston, but it's a little heavy. The Doo is just way to heavy for a 82mm piston.
Cat is better is this category.

Matching the two piston weights is the key too.

 

[Bigfuse]

It's all of the little things that add up to good performance.