40T rather then 39T - Page 4 - Triumph Forum: Triumph Rat Motorcycle Forums
Water Cooled Twins Talk Discussion of water cooled Triumph Twin related matters and topics.

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post #31 of 44 (permalink) Old 05-18-2018, 10:41 PM
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Iím happy with the setup I bought from https://www.ajcyclesny.com/product/a...umph-classics/


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post #32 of 44 (permalink) Old 05-18-2018, 10:52 PM
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I think I found something that should make it accelerate significantly better.

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post #33 of 44 (permalink) Old 05-19-2018, 12:40 AM
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I think I found something that should make it accelerate significantly better.

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should work well i just realized your going down one in front and up 2 in back. (my edit), I went with a 44 tooth rear. in conjunction with a decat a sweet combination.

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post #34 of 44 (permalink) Old 05-19-2018, 03:58 AM
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I recently asked this torque question to a friend of mine who has done professional moto-mechanic work: he recommends to go with the 29 ft-lb and apply some blue loc-tite for peace of mind.

of course I don't have a 17mm socket that fits those nuts so I just tightened them down to approximately how tight felt "right."
I am surprised that your 'professional' moto mech would suggest lubing a nut with loctite and torquing it to the max torque that the nut is rated to.

I would suggest lowering the torque of a lubricated nut to 60% of rated.
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post #35 of 44 (permalink) Old 05-19-2018, 02:39 PM
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I am surprised that your 'professional' moto mech would suggest lubing a nut with loctite and torquing it to the max torque that the nut is rated to.

I would suggest lowering the torque of a lubricated nut to 60% of rated.
i'm sure i misrepresented him / oversimplified his response. he didnt mention the 60% of rated, but did say not to exceed the 29 (vs the steel nuts higher rating). he was probably giving me more credit than i am due for knowing stuff. but thanks for the heads up on the 60% of max goal. Ill keep that in mind.
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post #36 of 44 (permalink) Old 05-19-2018, 04:13 PM
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I'm not sure I would reduce it to 60%, but some is in order. If you google "How much does lubing threads affect torque" you will find varying answers. Loctite produces some good articles on thread mechanics. One of the things it points out is the clamping power of a threaded device varies significantly with a bunch of things, ranging from the batch of bolts that you get from the manufacturer to the type washer that is or isn't present, not to mention torque wrench you use and how you use it. Most of us act as if torquing something is an exact science that will be repeatable from application to application when it isn't at all. It is almost more important that you torque a series of bolts to the same setting. The value you use just gets you into a range.
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post #37 of 44 (permalink) Old 05-20-2018, 05:12 PM
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@cougsfan thanks for the further info. I'll definitely be grabbing an adaptor for my torque wrench so I can check that the bolts are all approximately equal. I ended up not putting on the loc-tite after all, by the way. It seems like there is a lot to learn about maintenance of these machines!
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post #38 of 44 (permalink) Old 06-29-2018, 11:05 AM Thread Starter
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40T rather then 39T

During winter I had bought a few sprockets and with the addition of my Cam kit, my 39T was useless.

I decided this morning to install a 42T that I had bought from British Custom.

After installing the sprocket, I realized it was too thick and the chain would not sit properly on the sprocket. It is a 520 and not a 525 but the thickness is 68mm more. Iím sure this is not related to the powder coat on the sprocket.

For all of you who have changed their sprocket, have you used the original chain or was it replaced?




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post #39 of 44 (permalink) Old 06-29-2018, 11:24 AM
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For all of you who have changed their sprocket, have you used the original chain or was it replaced?
I went with one of these and it fits the stock 520 chain just fine:

https://www.ajcyclesny.com/product/a...umph-classics/

It appears to be manufactured by Rebel Gears:

http://www.rebelgears.com/
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post #40 of 44 (permalink) Old 06-30-2018, 06:11 AM
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I went with one of these and it fits the stock 520 chain just fine:



https://www.ajcyclesny.com/product/a...umph-classics/



It appears to be manufactured by Rebel Gears:



http://www.rebelgears.com/


Same sprocket here, I also removed one link from my original chain which made the adjuster sit nicely in the middle of it's range with the 39 tooth sprocket.


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