pinion ratio

[rjflyer]

My wife got me the Magnum for Xmas, and I have started to assemble.I want to put in an OS70. The pinion is a 10 tooth. Would That be OK for that size engine? I think it better to ask now, before I complete the kit :)

[cbergen]

Yep, the 60 and 70 should work well with the 9:1 gear ratio. For the YS 80 we go up to the 11 tooth, with the 91 using the 11 or 12 tooth.

Enjoy,

[rjflyer]

Thanks Chris, Can't wait to try it out. :D