Best V-belts?

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YAMMY21

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Mar 25, 2005
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Has anyone heard/read anything about what V-belts to own? Just wondering if anyone has had good/bad luck with Yamaha's factory belts, Gates, Ultimax? I have a Viper and am a fairly aggressive rider.
 
yamaha factory belts all the way. heard good stuff about gates and ulti 2, but i think stock ones are the best
 
belts

i also own a viper and drive very aggressive and has never busted a belt. i only use yamaha because of the quality and performance. have put triples v force 3s and clutching on here this year and still havent busted a belt. currently have 10600 km. :rockon: :yam:
 
Use the belt that your clutches are set up for. There is quite difference in belt hardness.
 
if you want the best ultimate power transfer, the softer compounds like the ultimax's will be better off (like for drag racing), because the softer compounds allow the clutches to grab it better without slipping. The yamaha 8DN will last several times longer, but it is a lot harder which has the trade off of making it harder to get rid of belt slippage. There will always be more slippage with a harder belt. For the majority of trail riders and even amateur racers, this isn't really an issue. Either belt you choose, you need to set up the clutches for it, because they will perform quite differently. RPMs will drop considerably with the aftermarket belts because of their softer compounds = less belt slippage.
 
i used to grass drag and found that yamaha belts(canada)seem to be made to tighter tolerances.lengths seem to be bang on everytime as apposed to aftermarket belts seem to vary,i buy only oem.... :rocks:
 
definately right about that, the yamaha belts are made to very tight tolerences. Put two ultimax's end to end and you can pretty much guarantee there will be some difference in length.
 
4000 plus miles on a belt holy cow thats good oems the way to go but ive blown them before thats what a lot of ponies under the hood does
 
If everything is aligned and the center to center is within spec they will not blow belts. I have seen srx's with over 5,000 miles on one 8DN belt, and didn't blow, but replaced because it was out of spec, too narrow
 
thought I would share this

I read Hartmans tech about belts and so I bought a 70.00 (locally) Ultimax 3 belt , 20 miles later it was pulling the strings out and I doubt checked my clutch alignment etc. to find everything ok . So I cut off the string fibers and went for another ride on the pass , Alot of wide open climbing and working the piss out of it . It lasted another five miles , then BOOM , blew into about fifty pieces , except for the outer shell . THIS SUCKED ! right at the top of a straight up incline , very bad place to happen and I was quite upset !!!! So I used my back up OEM belt for the rest of the day with no problems , Then got a used OEM the next day from a friend for another back up . Been fine ever since , though it does tend to run around 9,000 rpms in soft deep snow when it's pegged , I just have to be a little more aware of it thats all . SO NO NO NO on the Ultimax , in my opinion !
 
first thing, is no the dayco's will not last as long as the 8DN, the 8DN is hard as hell and tough as nails, but the dayco will last much longer than it did if you break it in properly (a nice easy 50 miles with a lot of throttle position changing, no long wide open pulls). You can't just jump on a new belt and ride it like a donkey until the compounds are cured. Second, if your sled is revving 9,000 and you aren't piped, its not the belts fault, you need to get in that cluth and add some more tip weight.
 
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