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Primary chain tensioner.
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BantamBaz
Reading Berkshire
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June 12, 2020 - 12:42 pm
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Hello again, 

I've been looking at the idea of a tensioner on my primary chain. The chain is fairly new but still has some sag in it.

I've seen a couple of ideas, the metal work is no problem but I'm not sure where to source a roller.

Any info always welcomed.

Thanks

Barrie.

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Blue Heeler
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June 12, 2020 - 1:30 pm
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Hi Barrie.

The Trials chaps use them when they go down a tooth on the crank sprox. 

I don`t like to tension the primary chain but made a guide to stop one such chain flapping about. I used a teflon gudgeon-pin button out of my `76 PR Guzzi. Late mate who ran an engineering shop in Leics, gave me a length of round the other year. When I can find it, I`ll send you a pic and if you fancy, I can chop a piece off for you....gratis. 

Can use shoe(pad) or roller type as a guide. Stationary or spinning. Quietens the Bantam engine unit clatterings & rumblings down a tad.

Blue

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BantamBaz
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June 12, 2020 - 1:41 pm
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Thanks blue, 

Any info is good for me.

Barrie

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bantammad
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June 13, 2020 - 9:33 am
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Hi bantammad ere  the trials people use a slipper tensioner arrangement more like the what’s used to tension a cam chain on a Norton Dommi as an idea from the shed Les 

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Number6
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June 14, 2020 - 5:24 pm
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Same thing on my Meriden Triumphs, for primary chain, and adjustable. Rubber faced, however the rubber could come off (guess how I know!)

Question for Barrie, why do you think you need this?

 

Only one I ever saw using a toothed wheel was my Honda CD175, adjustment was manual, you had to turn a bolt to take out the slack then lock it up with a locknut, there was a spring of sorts, I think you had to loosen the locknut, turn the engine to get slack in the return run then screw it in to remove the slack but I can't remember what you did to test if it was done up enough. It was a right PITA to do I know that. http://livinginthepast-audioweb.co.uk/imagex/misc/ohmy.gif

Note the toothed jockey wheel had very shallow teeth, just little "bumps" not pointed ends, Honda must have had a good reason for making it like that.

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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BantamBaz
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June 14, 2020 - 7:54 pm
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No 6 & BM, 

Thanks for your input & interest.

My thoughts were 2 fold really.

Firstly I had read that D14's tend to have a bit of judder on over run,  this could be reduced by fitting  a tensioner / guide. I'd come across one. in my internet trawling

Secondly I've got the cover off & although the chain is quite new there is a bit of slack in. Why not investigate the issue & see what can be done whilst it's stripped ?

It's an ongoing refurb rather than a restoration.

I've been offered some Teflon, have a bit of engineering skill & facility so why not ?

Barrie.

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Number6
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June 16, 2020 - 9:02 pm
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Firstly I had read that D14's tend to have a bit of judder on over run, this could be reduced by fitting a tensioner / guide. I'd come across one. in my internet trawling

I would maybe want to estabilsh whether there's actually a problem first .. there may not be .. laugh

-

Secondly I've got the cover off & although the chain is quite new there is a bit of slack in.

A bit of slack is normal and desirable, certainly should not be "tight".

This is kind of similar to what I've seen so many times on the Moto Guzzi forums, which use a chain for the camshaft, and a very simple slipper block to take the slack out of the long run. There is and has been over the years a bit of an obsession for some people about getting a better guide or tensioner "to stop the chain hitting the inside of the crankcase".

If it's hitting the inside of the crankcase, it's worn out and needs replacing! laugh

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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June 20, 2020 - 8:32 pm
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N06: Gliding over a Teflon guide wheel should cut down on some chain clatter, even with a new Bantam primary chain & presumably prolong its life. 

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Can get a free decibel app for mobiles, if ever someone fancies taking a before & after reading.

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AdrianS
Harlaston Staffs
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June 24, 2020 - 3:19 pm
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Progressive Classic Products sell one. It is £25 pounds or there abouts and looks quite easy to make if you want to try.

I cant remember if you need to tap threads in the mounting posts on the chaincase.

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bantammad
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June 24, 2020 - 3:38 pm
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Hi looking forward the slipper chain tensioner is a good mod but to be honest if the bike is only used for general use isn’t it cheeper to just replace the chain at £15 quid just a thought Les 

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Number6
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June 24, 2020 - 7:15 pm
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I wasn't going to say anything further, but yes, when it starts slapping the inside of the crankcase means it's time to get a new one,

http://livinginthepast-audioweb.co.uk/imagex/misc/meerkat_simples2.jpg

http://livinginthepast-audioweb.co.uk/imagex/misc/biggrin.gif

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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