Post by speedy1125 on Oct 7, 2011 3:01:05 GMT -5
enviromoto.ecrater.com/p/10358339/stage-6-primary-gear-18-50-gy6-139qmb
3:1
enviromoto.ecrater.com/p/10358337/stage-6-primary-gear-17-51-gy6-50-139qmb
Stock secondary gears are usually 52/15 (3.47:1). With the first set your final drive ratio would be about 9.65:1 and with the second it would be about 10.4:1. I think the stock primary gears are usually 16/52 (3.25:1) to put the stock ratio around 11.3:1.
Just for some idea of the effects, I made a little table for ya. Remember, engine RPM doesn't actually work here, because of the CVT. You'd really need to know the RPM of the rear pulley for this to be accurate. Tire size will also affect MPH. This is done just using a 100/90/10 for reference. Again though, this might give some insight into the effects.
| FD Ratio | 5,000RPM | 7,500RPM | 10,000RPM |
| 11.3:1 | 22.62MPH | 33.93MPH | 45.24MPH |
| 10.4:1 | 24.58MPH | 36.87MPH | 49.16MPH |
| 9.65:1 | 26.49MPH | 39.73MPH | 52.98MPH |
I'm heavy, but I would stay with the lesser upgear (3:1). These engines just don't have tons of power to pull very long gears from my experience, but then again I was 300lbs or slightly over when I was messing with my 80cc GY6.
where does a 49/17 fit on the chart?
