low compression pistons

[hondauser]

Hello

what would be the influence of low compression pistons on the CB72 engine???
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[G-Man]

Hi Hondauser

It depends what you are looking for. The power will be less with lower compression and standard bore but if you go to a larger bore with a flatter piston, you may get a better combustion chamber shape and improve things.

I am going to experiment with a 305 engine with flat-top pistons as a project one day. I think it could be interesting.....





G

[hondauser]

chinese pistons !!!

the goal is to find in Chinese production pistons that can,be adapted, to our engines, 250 and 305 cc. there are quantities often overbore with an axis of 15 mm and modern rings, but also less compressed ,
and also , LOW PRICE !!!

[Nick]

Lower comp pistons will give easier starting, smoother running and a bit less power.

I built my BSA 650 with lower than stock compression and am very happy with the performance. It starts very easily, vibrates less and still has plenty of power. I also fitted taller than stock gearing to drop the rpm on the highway.

Whether it's a good idea to run "cheap Chinese pistons" in your bike is another matter altogether....