I found a jackshaft on Fleabay for around 90 dollars and it looks like it's one of the older SBP kits that they discontinued. Any experience anyone? Also wondering if I got this and the HD freewheel (assuming compatibility) if it's just a cheaper solution to the jackshaft money issue?
http://www.ebay.com/itm/Jackshaft-K...083935?hash=item28223c871f:g:DEgAAOSwpLNX~sy1
Wow, blast from the past, I had to go back 6 years to find this one I did, and used on the bike of my forum pic.
More details in my forum topic about the build.
http://kcsbikes.com/topic.asp?TOPIC_ID=77
In short, a long nightmare to make it work right, and the new SBP mount, though not 'easy' itself, is vastly easier than that original but sure cool at the time, it was the first thing made to use your bikes gears with an engine and have been building shifters ever since.
The flebay kit no doubt uses the cheap freewheel bearing at that price.
The freewheel bearing is not something you want to cheap out on with a 2-stroke.
The ~$50 difference in kit price is the price difference of that one-way bearing your right pedal connects to that allows you to 'kick start' your engine.
You can get away with it on a low compression 48cc engine, but not a 66cc, especially with compression mods. I learned this the hard way, I built a 48cc shifter and the customer decided it wasn't enough power so I swapped the engine for a 66cc.
A couple dozen kick starts later it failed, and they don't fail 'friendly'...
It won't come back off so not only do you have to buy the good bearing, you need new pedals and the large outer sprocket as well.
The 'regular' freewheel bearing however holds up just dandy for a pull start, you never have to engage it to start the engine.