Spring Return Chain Tensioner

At first I used the spring that I bought with the tensioner, additional item, but made to work with the tensioner. I didnt like it and couldnt find the "torsion" spring I needed so I made my own by cutting, heating and forming a large gate spring...

I originally used the one that was sold seperately to be used with the tensioner. I ended up buying, heating, cutting and forming my own spring out of a large gate spring. The correct spring to use that I was unable to find is known as a "torsion" spring..
Hope this helps..

Is there some place on line that I could order the set up. The stock tensioner is crap, and I just spent several hours looking through local stores with no luck.

You could contact Tractor Supply Co online. I imagine they would be able to order tham for you. Just give them the part numbers...

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"No such thing as a stupid question, just a stupid answer"

48cc Grubee Starfire Round Head......

Fred, I'm sorry I lost your email add. My chain rides about 2'' from my seat post. It rides closer to my rear tire because I am running a wider #41 chain. I have the tensioner shimmed way out, but it can be moved in on the allthread rod. You must have a large down tube for the chain to be rubbing on it huh? Any other question please email me or post here and I will be happy to help answer your questions...
George........

I know that not running one "may" mess up the countershaft seal. But I have a bearing seal puller from Snap-On and am just daring it to fail! Used it three times so far in 6 years! $ 55.00 back then! I know it's, there even tho I have never seen it hiding behind that front sprocket.

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Only Bikers know why dogs love to stick their heads out of car windows,

You can not use a spring tension-er for the drive chain, for the reason that when you are starting the bike the pressure compresses the spring and the chain is then loose as it feeds into the engine. Or on a downhill the same thing. You can use it to put the tension on the chain and then lock it down. If you have the normal amount of slack and can not get the chain close to tight you will have a problem. Look at the Russian bikes they are the ones that invented this engine, no springs. Hope this helps. Have fun, Dave

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Chuck - The monkey has the spark plug again! http://motorbicycling.com/f28/chuck-...gain-5782.html

I have had this spring return tensioner and the #41 chain on my bike from the beginning of my build (over 4 months ago) as I did not like the stock roller tensioner and stock chain, and have had no problems. It has worked flawlessly for well over 300 miles. I am not familiar with Russian bikes, but the brand of minibikes and atv's that Tractor Supply Co. sells (Baja Motorsports) use them on their products.

99, I have looked at the pic of your bike, you are one of the fortunate ones that have a setup that essentially does not need a tensioner. Your bike needs nothing the chain is at perfect adjustment. If your bike was like so many others that have no adjustment at the wheel and only a the chain adjuster that comes with the kits or something like it to take up the slack you would understand. If later your chain stretches enough to get loose enough to derail you will need a follower that will stay the same when in compression, if not the chain will go slack in the starting or downhill. The machines that you are referring, to have a normal ability to adj the chain, that follower is to insure the chain is in line with the rear sprocket at high speed. If they made half links for the chain we are using we could get our bikes to the level of tension you have. Have fun, Dave

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Chuck - The monkey has the spark plug again! http://motorbicycling.com/f28/chuck-...gain-5782.html

Not haveing started one of those Chinese in frame projects yet I've been following these feedback post on the issues builders are having them. The thought entered my mind for a spring tensioner similar to the rear derailer tensioner (although I doubt one would be available for a size #41 chain)
But in principle....at least it would take up the slack and be flexible.

It seems these chain tensioners are really the #1 issue, followed by the rear sprocket mounting.

I'm sure that in China were they are cranking out this #41 chain that they could easily tool up to make 1/2 links and in time a better tensioner. Usually when there is a crying need for something better someone rises up with "aftermarket" solutions like we're seeing here with 99's solution.

I'd like to see 99 take his photos and put up a post on the "Take a tip & Leave a tip" topic. If he wanted I'd be willing to sketch a black and white projection drawing of how to do it for those wanting to try it.

.......and Egor, thanks bunches for explaining that chain geometry. Recently I was reading about a "lock up" condition where the chain kinking up in the counter shaft gear housing could lead to that...........which once again is a chain tension issue. I've wondered when I look at alot of those old turn of the centruy British bikes that had "chain guides" (I think I saw one set up on an old Excelcior bike) before rollers became popular that just setting up a guide may be the way to go. Yeah, it would be cheap & dirty.....and likely loud....but perhaps dependable.