View Single Post
Old 03-28-2009, 08:51 AM
Jimigunne Jimigunne is offline
Motorized Bicycle Newbie
Join Date: Mar 2009
Location: Corpus Christi, Tx
Posts: 16
Default Newbie with questions like tensioner upgrade

I have an 80CC Chinese 2-stroke gas mod kit installed on a Schwinn cruiser. Its the common one that many dealers are selling on eBay. The manual that came with it was worthless, there are NO assembly instructions and exploded diagrams are almost unreadable. I need some instructions on how to tune the engine if its stalling at idle. My boys test-rode it for the first time and it works. However, I think its likely that the engine chain is going to come off and do a lot of damage. The tensioner is nothing but a nylon roller with NO bearing at all, and I would be surprised if it lasts more than 50 miles. Overall, its very cheaply made, low-quality.
The first thing I need to upgrade is that idler/tensioner. I am thinking that an automotive timing belt idler/tensioner could be adapted to work quite well. They are mounted on a spring-tensioned plate, so that as the belt (or chain)stretches they still keep a constant tension. I don't have an old car to get one off of, though to experiment with. The other idea is to replace the pathetic stock roller/tensioner with a skateboard wheel. I guess one would have to make a whole new plate and use a bolt of correct dia. as the shaft.
Next issue is the clutch lever. The way the cable is attached with that little hex bolt is going to be trouble.
Also, I have an electronic speedometer/mileage gadget on handlebars, but so I can keep track of total engine miles, etc. and not lose mileage when for instance the battery goes down, I would like to buy a mechanical speedometer and odometer....can you still buy these things?
Lastly Is there a dealer who sells a kit like this but with a 4-stoke engine? I would like to build a 4-stoke gas moped next.
Reply With Quote