NSR-lizard wrote:The post title should read "Double ring pistons/lightened flywheel vs. Single ring pistons/total loss flywheel"

Don't forget different squish and presumably different combustion chamber volumes....


We've seen 0.2mm varience in sqish (with stock chamber profiles so 0.4cc difference in volume) make a difference of 4bhp on it's own.


What you need to do this comparision properly is;

Dyno the bike on the twin ring piston (with fresh rings).
Measure the squish.
Fit the single ring piston with fresh rings, set the squish the same.
Dyno the bike again.

I don't know what the exact measurments of the single ring pistons you're using so have no idea if this is easily achieved. If the single ring pistons are shorter then you may have to machine the barrels to suit the single ring pistons and pack it with gaskets to run the twin ring setup.
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