I just finished my Speedway widowmaker with a centrifugal clutch setup. I used the original jackshaft and gearing (JS output/tire side). I am using a HF 6.5 clone stock. So my gearing is a 10 tooth on the clutch-10 tooth JS input-8 tooth JS output-60 tooth on the tire. Now I used 2 separate calculators to find my final gear ratio/ estimate speed:
Rawge's Mini Chopper Information Site - Jackshafts
Burris Racing Jackshaft Calculator
My FGR came to be 7.5:1 and top speed is around 19-20 mph with 14'' tires.
Here is the confusing part....After a few passes and having my brother-in-law ride side by side with a quad, I was doing 29-30 mph and that wasn't even WOT...What gives?
What am I not seeing or calculating right?
I've read that some people have bought a HF engine and the governor isn't working so they can achieve higher RPM's, but that would mean I would have to be running 5600 RPM...
Thanks in advance for any input.
Rawge's Mini Chopper Information Site - Jackshafts
Burris Racing Jackshaft Calculator
My FGR came to be 7.5:1 and top speed is around 19-20 mph with 14'' tires.
Here is the confusing part....After a few passes and having my brother-in-law ride side by side with a quad, I was doing 29-30 mph and that wasn't even WOT...What gives?
What am I not seeing or calculating right?
I've read that some people have bought a HF engine and the governor isn't working so they can achieve higher RPM's, but that would mean I would have to be running 5600 RPM...
Thanks in advance for any input.