Good stuff right there. Thank you....


If you don't mind me asking, what kind of RPM are you getting? And what is normal for say a Yerfdog?

Lastly, if I may ask, what is the rev limit on the stock CDI for a Yerf? Thanks again

It stills pulls at 9000rpm which for drag racing is fine but prolonged driving its too high. Right now I'm running the stock sprockets with 3:08 final gears. I'm looking for around a 2:80 or 2:90 gears. I think with those ratio's I would keep much of the bottom end but improve top speed a good bit. Normal for the Yerf between 7600 and 7800. A stock engine will quit pulling at around 7200-7300 rpm.

Great, thank you.

I have to look at the tach I used because I think it was set up for a 2 stroke. It said I was only doing 4000 RPM at the end of my top speed run. But I could hear she was wound up pretty good. So prob closer to the 8000 RPM range then.

I need to pull some RPM out of it.

If the wider spreading driven pulley (KNM performance) doesn't do it, I'll prob be looking into going with the 14/38 internal gears as opposed to my stock 13/40.