Thread: Chain Tensioner
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Old 05-28-2011, 09:25 PM
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mapbike mapbike is offline
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Join Date: Mar 2010
Location: Central Texas
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Default Re: Chain Tensioner

Originally Posted by TANGO View Post
I am a Truck Mechanic and yes think in that same way when Building most everything . Well on just about all cars and Trucks today they run Belt Tensioner's and sure it keeps an even Load on the Belt making it track much better and preventing it from walking off . I ordered a 80cc Super Rat kit and once it's Dialed in I want to run it all out . I was thinking that Chain Tensioner would be a real good add on . I found this one after searching the Forum Better yes I am new here . Also I am seeing that I might be better off Looking for a good older bike with stronger rims and spokes .

Here is that tensioner but Looks kind of Light duty ? Spring Loaded Chain Tensioner for Gas Motorized Bicycle Plans | All Parts | Parts for Gas Powered Bicycle Motor Kits | Live Fast Motors - Gas Motorized Bicycles and Gas Powered Bicycle Motors
Yeah I remember seeing that set up, it's just been a while.

What we fail to realize sometimes is that on these engine kits the engines are started by "popping" the clutch, when this is done it throws all of the chain tension to the lower chain and if there is a spring tensioner there the sudden release of the clutch will overpower the spring and cause the chain to get very loose and many times that is when the problems start, chian comes off posible tangles up and locks up rear wheel or might even break spokes on any rate NOT good..!

Now if the spring loaded tensioner had a possitive stop that would not allow the tensioner arm to drop to an extreme point when the spring was over powered then it would likely work just fine that way.

The problem is when the engine is started or when backing off the gas while the bike is going down hill, that is when all the tension is moved to the tensioner rather than being at teh top portion of the chain like it is when you're under power from the engine.

Here is a pick of what I put together for one of my bikes and it has never given me a single issue in 550+Miles so far.

Hope this helps and possible answers a question or two.

Attached Images
File Type: jpg skateboard wheel tensioner.jpg (66.1 KB, 109 views)
I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!
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