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#326506 - 08/04/10 4:06 pm A65 primary chain tension ?  
Joined: Jun 2006
Posts: 555
Kenacu Offline
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Kenacu  Offline
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Joined: Jun 2006
Posts: 555
RED BANK NJ
I just re tightened the primary chain on my 1965 A65 LR as per the manual, which states "1/8 in. of top to botom play" in the top section of chain, mid span. Now 1/8 in. play is darn near "tight" as well as I can figure. Is this right? or is there some secret meaning to this?. Ken


1965 A65LR
2005 SPORTSTER CUSTOM 1200
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#326512 - 08/04/10 4:27 pm Re: A65 primary chain tension ? [Re: Kenacu]  
Joined: Sep 2002
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Alex Offline
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Alex  Offline

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Seattle
It is very close to tight...but I would modify the manual's directions to say "no less than 1/8" of play at any point in the primary drive's rotation". Rotate and check, rotate and check...do this at least four of five times. Runout in the crank sprocket and clutch basket as well as uneven wear in the chain can produce tight spots which you want to avoid.


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#326515 - 08/04/10 4:44 pm Re: A65 primary chain tension ? [Re: Alex]  
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Posts: 12,063
Lannis Online content
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Lannis  Online Content

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Central Virginia
The spec is very confusing. Does it mean "1/8 of free play" or "1/8 of chain movement"?

The chain can be as tight as the high G string on a banjo, and you can still "move" it 1/8" with your hand. I don't think that's what the spec means.

I personally interpret it to be 1/8" "Free Play", where you can wiggle the chain and feel it "hit" the non-free-play region on the up side and the down side, where it'll still move but it's tight.

That's my story and it's worked for me - my present primary chain is the same one that came on the bike new and it's never been a problem.

Lannis


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#326749 - 08/06/10 12:49 am Re: A65 primary chain tension ? [Re: Lannis]  
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Mr Mike Offline
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Mr Mike  Offline
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Cape Carteret, NC
Believe it or not, but the manufacturer of industrial chains and sprockets, Browning, described the identical process. For a few bucks you could buy an aftermarket chain tensioning measuring device, but I have found the freeplay, feel system to be adequate. The greater the center distance between sprockets the more free play. On the a65 you want it reasonably tight but not so tight that you put excessive load on the bearings which are further loaded when you accelerate. You will also wear out the chain prematurely if it is too tight and stretch it. If it is too loose you will know it when the rear wheel drives the engine..going down a hill with the throttle closed because now you have the tensioner on the driven side where it does not work so well.. I set mine where I can deflect the chain about 1/8 to 1/4 inch with modest force at the midpoint..whatever that is..... and it seems to work well.

Mr Mike

#326842 - 08/06/10 10:38 pm Re: A65 primary chain tension ? [Re: Mr Mike]  
Joined: Feb 2007
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Semper Gumby Offline
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Semper Gumby  Offline
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Atlanta, GA USA
I set mine so it deflects 1/8" inch with a light touch of the finger.


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