Comments on: N-MP-09532C 70cc Kit Cylinder, Piston, 48mm Big Bore kit MRP

By: hacks2007

hacks2007 — Wed, 25 Feb 2009 16:54:30 +0000

I have a de-restricted 2002 model rs50, and i was just wondering wether it was a good idea to put a big bore kit on it. is it unhealthy for the engine?

By: tpvalley

tpvalley — Tue, 24 Feb 2009 09:48:12 +0000

I like the look of that.
Did I see right, did it have auxiliary exhaust ports aswell as main port?
Single ring piston; what rpm is peak power developed? how long between ring changes?
How does it compare to malossi mhr for power?
obviously if its cheaper and giving good power it can be better bang for buck than malossi!

By: tpvalley

tpvalley — Mon, 23 Feb 2009 15:32:49 +0000

I have never seen a cast iron kit with auxilliary exhaust ports.
what kind of power from the big bore kit with exhaust and 21mm carb? 8bhp?