Hi guys, I need more power from my homelite 25. Right now it's running a stock 2 needle zama carb and a two pipe muffler that I made, with 3/8" exhaust tubes FYI. It will turn an APC 15 x 8 7,200rpm on a 95 degree day, but that's not enough! What can I do that won't cost much and will be effective?
Thanks in advance!
Jim

This should do ya:

http://www.rcuniverse.com/forum/m_26...tm.htm#2677889

Have fun,
AV8TOR

I think you will need to turn in the neighborhood of 8000 to make power.

Here is data on another brand of 25cc engine (McCulloch) that might be helpful.

Thought everyone might like to know that Ken’s muffler is good for 1100 RPM on a stock 25cc engine with no other changes.

Started with a stock engine.
16 x 8 MA K series prop – 6700 RPM

Muffler only change but did turn the carb screws
16 x 8 MA K series prop – 7800 RPM

The other engine with modified exhaust duration turns 8200 RPM.

Bill