2-speed for ht bicycle engines?

Re: 2-speed for ht's?

That would be rad. Ive seen people run 2 sprockets in the back (no jackshaft) but never that. I would think it would stick out a little just like a pull start
 
Re: 2-speed for ht's?

It would take some custom machining to make it work, but I see no reason it couldn't be done....except that $1100.00 thing of course.
These work by having a second drive and pinion gear on the same shaft with a centrifugal arm that flies out and engages the next gear at preset RPM's. The second gear runs on a one-way bearing that lets it take over the shaft when engaged and slip when rpm's are lower.
 
Re: 2-speed for ht's?

maniac57 said:
HEY AFTERMARKET!
We want something like this that fits the chinagirl. If you could make it fit under a stock thickness clutch cover, that would be even better...
http://www.ebay.com/itm/New-King-mo...adio_Control_Control_Line&hash=item1c2ff4ef35
Click to expand...
Affordable Go Karts has already tried a 2 speed go kart set up
on their 99 cc Predator race bike.
They decided that it added complexity without much performance gain
so they went back to a single speed jack shaft.
 
Re: 2-speed for ht's?

MotorBicycleRacing said:
Affordable Go Karts has already tried a 2 speed go kart set up
on their 99 cc Predator race bike.
They decided that it added complexity without much performance gain
so they went back to a single speed jack shaft.
Click to expand...

Okay. Pi$$ in my cheerios.
I want this to work SO BAD....
I had an RC truck that I installed a 2-speed on and that thing RIPPED!
Of course, being a .12cc glow engine,
it had about three times the power of a chinagirl. :)
 
Re: 2-speed for ht's?

The main problem is going to be the cost. It's more than a whole china girl motor. Another problem is it would probably make a motor bicycle turn into a motor vehicle in most states, because it would likely become classified as self propelled.
 
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