Thread: how to increase compression on a 2 stroke?

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would a boost bottle help? I understand the theory behind how they work. and there advertised to increase torque, but would it really help?

I don't even know what a boost bottle is.... but I hope you'll report how this project works out. I'm really interested, I just might do the same thing.

Originally Posted by 65ny

I don't even know what a boost bottle is.... but I hope you'll report how this project works out. I'm really interested, I just might do the same thing.

boost bottle is a bottle that has the same volume ( within 2cc ) of the engine size.. a 2 stroke makes compression on the down stroke also, and when the compression is made a 'wall of air' is created obstructing the intake mix a bit on the up stroke. the boost bottle is mounted above the carb/ intake and the fitting is threadded right into the intake.. when the compression air comes out, it has a place to go and it smooths out the mixture.... this is all theory that goes behind them anyway.. weather or not there are true gains IDK...


www.zoombicycles.com sells the kits with the high compression slant heads arleady installed.. I would have gotten there kit had I known it had those parts on it, but when I ordered mine, I still knew little about them

here is the bike sort of finished.. it's all done now ( needs tweaking ) but this pic doesn't have the chain shortened, clutch hooked up or tensioner installed.. still needs the tensioner modefied.. the rear chain stays angle in where the tensioner goes, so I have to twist the tensioner to accomadate that.. pulls the chain off the way it is.