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post #1 of 40 (permalink) Old 08-25-2011, 08:37 PM Thread Starter
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belt tension and heat

Has anyone noticed if thier belt gets tighter when hot? I adjusted mine the other day and i checked it this morning because it usually changes a bit after adjustment and a short ride, and i found it was quite loose. Not so much i wouldn't ride it like that tho, so i went the 12 miles to work. Drove home just now and was ready to adjust it when i pulled in but i checked it again and it was tight ! I pushed the bike forward a foot or so several times trying to see if there is a loose spot but it was even all around and quite a bit tighter than this morning. This morning it was cold when i checked it and when i got home it was of course hot from the ride. Plus the outside temp ranged from mid 60's this morning to about 85 when i rode home. Do they tighten up in heat? i would think the opposite, tho if the pulleys expand more than the belt i guess it could. I'll check it tomorrow morning and see if it's loose again.
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post #2 of 40 (permalink) Old 08-26-2011, 06:10 PM
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My guess is the pulleys/sprockets are expanding from the heat.
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post #3 of 40 (permalink) Old 08-26-2011, 06:54 PM Thread Starter
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Thats what i thought, but heres what scares me. If thats true, then consider this. Triumph says to set the tension when the bike is COLD, and thier spec leaves the belt VERY tight. If it's that tight when cold and it gets a lot tighter when hot, well...think about it !

I checked it again today when cold and again it was loose. I will check it again when i get home from work and it's hot. If again it's tight, then how the he|| are we supposed to adjust it correctly? I mean, it was extremely tight and when hot was like triumph says it should be when cold. So if you adjusted it tight like that when cold as they say, it would be insanely tight when hot.
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post #4 of 40 (permalink) Old 08-26-2011, 08:17 PM Thread Starter
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Well kids, i'm tempted to start a new thread to warn everyone but i'll just state it here and hope the word gets out. I just check my belt after the ride home from work, and once again it has gone from very loose when cold to very tight after the ride home. Thats 2 days in a row so this is no fluke.

Triumph's tightness spec is such that if it were much tighter it would likely cause premature belt wear or failure, and very possibly damage the output shaft bearing in time. And from what i am seeing here, the difference in tension in the belt from cold to hot is huge. And triumph says to set it cold ! No wonder mine was replaced under warranty....it was set to triumph specs when cold, which means when hot it must have been stupid tight ! All they'd need to do is change thier procedure to say "adjust when hot" and there would be no issues.

All that said, i'm no expert on this so if i'm missing something please enlighten me. But i can't see what i could be missing.

I would like to talk to a triumph rep about this. I already know for a fact thier alignment procedure outlined in the manual is faulty, now it's looking like the tension procedure is too. Check your belt cold then hot !!! You could be running it far too tight.
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post #5 of 40 (permalink) Old 08-27-2011, 03:19 AM
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Well this is their first belt drive in many many years.
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post #6 of 40 (permalink) Old 08-27-2011, 05:46 AM
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Could it be getting hot because it's too loose cold?i.e. moving / flapping slightly .
Thinking along the lines of how tyres get hot if the pressure is too low in them.
.

Last edited by wallacej; 08-27-2011 at 05:45 PM.
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post #7 of 40 (permalink) Old 08-27-2011, 05:58 PM Thread Starter
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With all due respect, I really doubt it.
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post #8 of 40 (permalink) Old 08-27-2011, 06:08 PM
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Ok,but if I was right you would let let me know eh?.If the belt is moving on the pulleys it would make the pulleys hot I reckon.

Last edited by wallacej; 08-27-2011 at 06:29 PM.
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post #9 of 40 (permalink) Old 08-27-2011, 06:19 PM Thread Starter
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Actually, what would be good is if some members here could test this and report back. Check your belt when cold then after a ride and let us know whether you noticed a difference.
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post #10 of 40 (permalink) Old 08-27-2011, 06:31 PM
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Quote:
Originally Posted by dazco View Post
Actually, what would be good is if some members here could test this and report back. Check your belt when cold then after a ride and let us know whether you noticed a difference.
Yesterday morning I swung by the dealership to have them check mine because i heard a funny noise from it the night before.
They adjusted it immediately while the bike was still warm. This mechanic talked to me and explained a good way to check the tension by twisting the belt and explained it should take some effort to get it sideways but it should get there.
I will perform his test tonight when I am down in the garage on the bike cold and report back the comparison between yesterday just after the adjustment and the cold (sitting all day)bike.
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