RE: Echo BME twin
Well, I have started on my BME 23.6cc STROKER twin. It is going to take a bit as I only have time to work on it a little at a time. I am using two 25cc cranks which have about a .100" longer stroke, and 23.6cc cylinders/pistons. You then have to make spacers to raise the cylinders up to accomodate the longer stroke. This allows you to easily set the deck height however, for optimum compression and performance. I will be porting the cylinders, etc., as well. I also need to come up with another reed valve assembly, though I have toyed with the idea of running two carburetors. Could be a real tuning hassle that way though, and take some of the fun away....
I have the crankshafts all modified and joined; just have to weld them now. LET ME TELL YOU, THOSE 25CC CRANKSHAFTS ARE HARD!! I flew through making the crank setup for my first twin with the 23.6cc cranks, but these 25cc cranks were a battle. At one point, I got too aggressive trying to cut into the surface hardness with a carbide bit in the lathe. The bit dug in, and CHIPPED THE BIT. You would think at this point the crank would probably be junk right? It didn't even nick the crank!! Anyway, it took some time but they are done now except for welding.
More as I get around to it...
Anyone have an extra reed valve assembly??
AV8TOR