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Old 06-26-2014, 12:25 PM
Lewis Lewis is offline
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Join Date: Jun 2014
Location: USA
Posts: 5
Default Re: (Motorized Bike Kit) Good Chain Tension Setting rear sproket

I don't live in Texas unfortunately. I live in New Hampshire. The land of motorized bicycle at least, the part where I live that is. People ride them everywhere here. That's how I learned about them.
Yeah, the rain comes and goes just like you described it. I think it's the mountainous nature. I'm very surprised how well the carburetor works out here since I'm above sea level quite a ways.


I tested my bike out today and it seems to work OKAY. I get a slight tugging from the chain. I rolled the bike and the tension is very consistent. I think I may need to knock out a few chain links? With that being said.
Where would be a good place to have the chain tensioner on my frame? Like, how should my chain look?
Should the path from the motor sprocket to the rear sprocket be as linear as possible with little tensioner interference?
I believe the chain tensioner is WAY to close to the rear sprocket which, gives it the shakes when you're biking at low speeds. It goes away when your biking at a higher rate of speed. I feel that it's so close but, it needs some tinkering still.
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Old 06-26-2014, 12:55 PM
2door's Avatar
2door 2door is offline
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Join Date: Sep 2008
Location: Littleton, Colorado
Posts: 16,222
Default Re: (Motorized Bike Kit) Good Chain Tension Setting rear sproket

Chain/sprocket alignment as well as chain tension is essential for a smooth running chain drive.

The tensioner wheel, if you must use one, must be aligned with the chain path. It can not pull the chain off to either side. Most, if not all kit tensioner brackets must be bent, or twisted to achieve this. The bracket as it comes in the kit does not allow for any taper in the chain stay and the tensioner wheel will be angled, not aligned with the chain.

The other big issue is securing the tensioner bracket so it can not rotate into the spokes. That has caused a lot of problems, both expensive and potentially dangerous for new builders. There are pages of discussion here on chain tensioners. Try the search feature and type in 'tensioner'. You''l have lots to read. Just make sure the bracket can't move. The best option is a bracket that bridges the seat and chain stay.

You'll want to maintain 1/2" to 3/4" of slack. To measure slack, engage the clutch, roll the bike forward gently until the piston comes up against a compression stroke. At that point the top chain run will go slack. That's the slack to be measured. Too tight or too loose will cause you problems.
Good luck

Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"
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chain tensioner, sprocket aliment

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