Those are pretty wild numbers, you’re right about that. I’m surprised you can run that low a clutch stall RPM.
Tell me about the pipe you now have. Header length from the piston to the first cone and the total length of the pipe.
I don’t have my old numbers for pipe lengths but I’ll tell you, my Number 1, for opens, was a lot shorter than the stock Mc91 pipe.
You might research Dr. Blair’s 2 cycle pipe theories. Belfast University. That’s where I got my numbers for my first pipes. His numbers for total length and header length are real close. I improved my pipes with changes in diameter and shape, but the lengths stayed the same.
One thing important is where the engine reaches peak torque.
Comments compliments criticisms and questions always welcome.
If the data does not support the theory, get a new theory.
Which numbers are you refering to? My port numbers or the clutch stall numbers that townglider uses?
Probably should be running closer to 11800 but havent been game to venture that far outside the spec of the clutch adjustment.
I use 11,200 clutch stall on my modified jica with the numbers i posted.