When rollers go bad fast, V-Max 600SX

K

kimoaj

New member
Joined
Jan 16, 2005
Messages
1,010
Age
39
Location
Norway
Hi guys!

A girl-friend bought a 1997 V-Max 600SX last fall, when we went to look at it I saw that the roller bushings in the primary had a little slack in them. I replaced the rollers and expected that they would last. Only thing was that the rollers where a little smaller then the old ones, so it rewed a little higher before it took off, but overall it seemed to work good, I only tested it on a flat field tho.

I guess my friend put in about 5-600 kilometers last year. As the season went by, she said that it seemed like the engine rpm dropped when she climbed long hills, I figured it had to be related to the wrong sized rollers in the primary. Today when we were down at the barn wrenching on the V-Max 4, I took a look at her rollers, and the bushings were toasted!.
Guess that`s why it didn`t perform well under load/long hills?.

Two years ago or so, I had a 1996 V-Max 600XT. Rode it for 300kilometers then it started to act funny and it turned out that the roller bushing were totally busted. Was probably bad when I bought it, but I thought it was a small issue.
I then replaced the rollers and the weights. The weights were suppost to have rivets in them, but I didn`t know that. Rode about 10 kilometers or so (not long), and the rollers had allready started to wear. Didn`t take long before they were fried. I thought it might have had something to do with the missing rivets in the weights (you think the wierdest things when you don`t have a clue what you`re dealing with). So I ordered new rollers and some rivets for the weights. At this time I had sold the sled to a friend and promised him I would order parts and everything was going to be perfect.

I got the rollers and replaced them, also put rivets in the weights. Then we went riding, didn`t take long before the rollers were bad again, 10-15 kilometers or so.

I had a thread going on here and I was told that the center-main-bushing (or what it was called) in the primary, was busted.

So my friend got a new Comet primary which was expensive (850$, sled parts are EXPENSIVE in Norway). Naturally the sled has run perfect since then, and still does.

My question, should I replace those rollers on my girl-friend`s sled or should I just tell her the bad news?.


Thanks for any replies !
:)
 
The clutch will be fine if you fix everything?Can you send back the comet clutch?
 
Hi pro116, thanks for the reply!.

I think you misunderstood, I havent fit a Comet on my girl-friends V-Max, I fit it on a friends V-max, he bought the sled from me.

I don`t want to spend ALOT of $ on fixing the clutch if I don`t know that it will be good.

What is worn out inside a primary that starts to wear out rollers fast?.
 
I have posted this about 5 times in the last few weeks here. On all the old Yamaha twin cylinder sleds once you wear out the rollers or weights once they will not last much more than 500 miles if you put new ones in and go through the whole clutch. You'll be better off and save money to buy a complete used clutch off a triple Yamaha and put that on. Once the twin cylinder primary clutches wear out they can't be rebuilt properly to keep them from wearing out the rollers/weights every 500 miles.
 
Hi Srxspec, thanks for the informative reply!.
So it`s not a smart move to rebuild it?. But I still wonder what happens with the primary when it starts to wear out rollers fast. Is something jamming up?.
If I get a clutch from a triple, will it need new rollers/weights to suit the 600 engine?.

Are Comet`s sold in USA?. (guess so). Aren`t Comet`s good clutches?.
If I can get one cheap from USA then I think that`s what I`ll do.
Hope Rich has them!:)
 
Srxspec said:
I have posted this about 5 times in the last few weeks here. On all the old Yamaha twin cylinder sleds once you wear out the rollers or weights once they will not last much more than 500 miles if you put new ones in and go through the whole clutch. You'll be better off and save money to buy a complete used clutch off a triple Yamaha and put that on. Once the twin cylinder primary clutches wear out they can't be rebuilt properly to keep them from wearing out the rollers/weights every 500 miles.
Click to expand...
I don't understand - if you replace all of the wear items (ALL bushings, etc), why wouldn't the clutch be just as good as new? Doesn't make sense unless the actual aluminum clutch pieces wear somehow...
 
My twin clutches are just fine,, over 2,000 miles and never replaced one
part on it,just keep it clean and use graphite spray on the rollar shafts
and wieght arm shafts,there like new yet..
 
Once the twin cylinder primary clutches wear out they can't be rebuilt
Click to expand...
Srxspec......can you supply more info??????

Just curious on why you say no rebuild :confused:
My 98 had 6000 kms on the clutches. Only thing I replaced was a spring (only cause I thought it might be getting weak). The rollers, weights, etc., were still good. I removed clutch every year and did a good cleaning, but that's it.
 
my cousing was the same way the sliders wear worn on the spider when they put new on'e on they had to shim them out,lol
 
Hmm.. I`m still confused.. .
But, if I were to but new parts for the primary here in Norway, it would be cheaper to buy a complete comet from Usa. But then again, I could also buy parts for the stock clutch from USA.. but... wellwell hehe:).
Guess the Comets are better then the stock ones ?.
 
You can replace all the bushings, wear pads on the spider, etc and the sled will still eat the rollers & weight bushings in 500 miles. It has to do with the harmonics of the twin cylinder Yamaha, once the clutch goes bad the first time it doesn't last long on a rebuild. If I knew why I'd tell you because it would've saved myself and customers money, but after rebuilding one clutch numerous times with a complete rebuild only to wear out the weights & roller bushings I chose just to put a clutch from a triple on as soon as a worn out twin cylinder one comes in the shop.
 
Ok Srxspec :). Thanks alot for the reply, makes things clearer.
So generally triple clutches last`s longer then twin clutches?.
How long should rollers last?.
My friend with the V-Max 4 who has 12.000km`s on the clocks, still has mint-condtion rollers, I doubt that the clutch has been rebuilt.. .

So the best thing to do if a clutch starts to wear out rollers is to buy a new clutch?. Either Comet or a clutch from a triple.
 
You must log in or register to reply here.


Back
Top