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Drive Belt Tension

7K views 9 replies 8 participants last post by  cra-z1 
#1 ·
I have an 07 with 20,000 miles. The belt has about 1/2 inch of deflection to it when cold. When it gets warmed up, the tension is good. the dealer says this is because when the metal gears get hot, they expand taking up most of the deflection. This seems like a lot of expansion. Has any one else had any experience with this much expansion. Also, I live in the Phoenix area and I am currently running 20/50 full synthetic oil with 10% Lucas additive. The reason for this, when I come off of the freeway after about 1 hour running in this heat, the engine sounds almost like there is no oil in it, it is so noisy. When it is cold, it sounds quiet. It even has an oil cooler which is why I don't understand why it seems like it should be getting so hot. Any ideas. Great bike except for this and love it.

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Jeffs
 
#2 ·
You ought to check out some test on engine oils. The Lucas does not fair to well on the info I have seen. Sorry no opinion on the belt tension.I live out in Buckeye. I have used the Amsoil 20w-50 in my air/oil cooled Triumph twin. It has over 73,000 miles on it now. Some do not like it in the Victorys because of possible clutch slippage.
 
#4 · (Edited)
You might want to research your facts just a bit...

Synthetic oil has better heat transfer qualities than dino oil, so your internal engine temperatures will be lower. The better lubricating properties of synthetic in general will lead to a longer engine life as well.

As far as the belt deflection... depends on how you are measuring it. The book says the rear tire off the ground and 10 lbs of force applied to the tightest spot on the belt. Great... spend your day measuring instead of riding. Instead with the bike on the ground twist the belt and if you can turn it 45* it should be fine.
 
#7 ·
#8 ·
Thanks Mags. Read the whole thread.... I think that is my problem and will test the theory this weekend. Bikes cold I don't hear anything, once it's ridden I get a 'moan / droan' from what I thought was the front end. Know I think it is the front pulley shaft because the belt gets too tight.
 
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