mountain riding

[papamua]

I'm setting up a mountain bike with a RAW 66cc motor for trail riding. There is a lot of uphill with switchbacks and downed trees. I plan to carry a chain saw initially for the trees and then explore. The kit comes with a 44 tooth rear sprocket and 12 teeth on the front. Does anyone have recomendations for gearing?

 

[Skyliner70cc]

I'm setting up a mountain bike with a RAW 66cc motor for trail riding. There is a lot of uphill with switchbacks and downed trees. I plan to carry a chain saw initially for the trees and then explore. The kit comes with a 44 tooth rear sprocket and 12 teeth on the front. Does anyone have recomendations for gearing?

Yes, 48-50 tooth sprocket...if you pay shipping, I'll send you one for free.

If you can afford it, get a sick bike parts shifter kit using a mega gear and you have best of both worlds...climbing and speed when you need it.

 

[papamua]

gearing

I now have a 50 tooth rear sprocket with a 10 tooth front. I also put on a SBC expansion chamber. It is great for dirt roads but still too fast for trails. I think I will try a 60 tooth rear from boygofast. Starting it on an uphill dirt road can be quite a chore. Anyone think a center stand would work? Start it on the stand, pull the clutch and go?

 

[Skyliner70cc]

I'm not sure what a center stand has to do with starting at a stop but unless you have a centrifugal clutch with a SBP shifter kit, you should not attempt to start from a stop. The manual stock clutch is pretty weak and you'll easily fry the clutch pads if you do it routinely.

 

[papamua]

centerstand

I thought that if I got the rear wheel in the air and kick (pedal) started the bike in gear, I could warm it up, take it off the stand and procede. Think that would burn up the clutch? Another option would be to get a pull starter and do the same thing.

 

[papamua]

You were right, I tried trail rideing with a 50 tooth rear. Not low enough. It's great for dirt roads though. I could try a 60 tooth rear but by the time I got set up with a wheel and chain for every circumstance, I would have spent the $200 dollars it cost to buy the shift kit. The SBC guys have been great with every order so I'm saving my money for that shifter kit.
I found some huge choke points in the intake flow when I looked at the matchup of intake port and manifold/gasket. The Mortoredbike section on porting is great, I recommend it. No wait. I read it and it's not about heads at all. Nothing but personal attacks. What a quagmire. It's the Viet Nam of Mortoredbikes.com Where can you find anything about porting?

 

[Skyliner70cc]

My current montain trail bike has got stump pulling gearing. I have a smaller drive sprocket (9 tooth) driving a larger sprocket on the freewheel all going toa 36 tooth Mega gear 1st gear. With a tuned pipe and a high compression head, it is nearly ideal for the steep hills. I do wish for a little more power to go a little faster at some of the higher altitude hills but it'll do for now.