50cc Maddog Gearbox Tooth Number - Anyone know?

[dexameth]

So I'm trying to upgear my friends Maddog 50cc 139QMB engine, and really just need to know how many teeth the large gear on the countershaft gear has... I know the 139QMB short case is a 51 tooth and the long case is a 52 tooth (I suspect the factories do this to even the speed out on the different size tires). If I can verify which tooth count it has I might be able to speed up this process for the guy... make less trips than I need to hopefully.

Thanks in advance.