Breaking 2nd gear help

[mikeymike1987]

Ok I have a 10mil cub 1-5 n-down override I race at west michigan sand drag way. My second gear breaks 1st launch of the weekend everytime. I am going to indicate the shafts tomorrow to see if they are bent. Or will a bent fork do this? The teeth are stripping off the smaller gear dogs are fine. I weigh 230lbs this could also play a role I guess

[Tedder]

We had that issue with our asphalt bike. Second gear is one of the weak links in a Banshee tranny. A billet second gear will stop the breakage problem. 

[mikeymike1987]

I agree thanks for your help...everyone at the track is telling me I don't have enough power to need billet 2nd. What size was your motor?

[RadarRacing]

110-120 can for sure break gears. Especially full size rider and good track. I think I will have a billet 2-5 for sale shortly.

[Tedder]

It doesn't take a big motor to break one. The one we "learned" on was a little 358 cub. Since going to billet back in 2006 we've never once had another break.    

[CottonBranchRacing]

Billet2nd's are the heat

 

You'll be doin this next..

 

 

CottonBranchRacing

[mikeymike1987]

Well looks like I'll have to bite the bullet $$$$$$

[trickedcarbine]

Asphalt gives ZERO FUCKS about your motor....... It will promptly make sure you know what the next weak link is. I've only seen one bike break 2nd on sand and it was about 120hp bike. Yet I've seen many failures on asphalt in motors from 90 hp stock cyls to 100+ hp cubs. That shit is aggressive and really takes it's toll on a motor.

[BANSHEE HP]

I broke a 2nd gear in a 421 on asphalt.

[mikeymike1987]

I got my last 2nd cryogenic hardened at our heat treat company just for the hell of it they charged me a case of beer. Been through 3 gears now and I race in the sand 76r/o 14paddle extremes