RE: Echo CS3900
The 40cc engine I am trying to get off the ground is a clone of the Echo CS3900 except for the engine is ported better than the Echo CS4400 engine and the intake flange is like the CS510 or 520. I think that power will be as good or better and I was very impressed with the quality. I am going to stroke the crank and raise the compression ratio. Even though this is a big investment for me I like the idea of getting everyone to try a quality gas engine at an entry level price.
Keith
BME