Losing RPM and not holding normal top speed

[suburban]

what does hauck use for wts ? something is definitely off with that set up . like jamie said, there is no need for a 8dn belt. the new viper belt is same compound as what we have all been using in the 8dn, just a diff length.

 

[YamahaTim]

Is there more to this story? Only the belt change doesn't seem like it would cure a clutch binding situation. Did they modify the secondary in any way? If the belt is wider how does if fit in the primary clutch? I am not saying I don't believe YOU but am wondering if they did something else also.......

According to them they just shimmed the secondary. And put a different helix on it. I didn't need the helix, as they thought I was over revving. I was not it just at take off it would hit the rev limiter. Then once it got going it would stop. So they just tried to fix that with a different helix. It should be the same primary, so if it fit before what would change that now...just wondering. It does not go all the way to the top of the primary anyway. I pretty sure they would tell me if they did something else. We have a pretty good relationship. But I will call tomorrow and confirm.

 

[YamahaTim]

what does hauck use for wts ? something is definitely off with that set up . like jamie said, there is no need for a 8dn belt. the new viper belt is same compound as what we have all been using in the 8dn, just a diff length.

I'm not sure what Hauck call them and I'm not sure the weight of them. And I think the new Viper belt does have some different compound. I read that in a Snow Goer. I think. I can try and find that. But I know I read that a few times. Not totally different just a little different. The reason they tried the belt is because they seen a 450hp sled sitting right there next to them and thought the sled runs a 8DN so let try it. I never got an answer for what the real problem was. I do know it's fixed. I'm not BS ing you can talk with Matt at MPI or Yamadog he was with me riding and at Hauck. Or ApexGT40 he knows about it. Or even Tom MR.Sled. I would not make this up. I don't understand what my first problem was...no one I asked knew. So at least they fixed my problem. And like I said I already have a few of them and they are cheaper, and proven.

 

[TurboJamie]

It just does not make any sense to do that they did, been around this a long time. A longer belt will be slower. Straight helix isn't IMO the way to go for trail riding. I posted a very good setup with over 4000 miles now on the original belt. Something in your setup was fubar from the get go.

Does your max out the gearing? You should max out that sleds gearing in 1000' at WOT.

 

[YamahaTim]

It just does not make any sense to do that they did, been around this a long time. A longer belt will be slower. Straight helix isn't IMO the way to go for trail riding. I posted a very good setup with over 4000 miles now on the original belt. Something in your setup was fubar from the get go.

Does your max out the gearing? You should max out that sleds gearing in 1000' at WOT.

I don't really know what went wrong. I wish I did. So that Yamaha could fix it. I have not got top speed yet to where I'm hitting the rev limiter. I got it up to 111mph I didn't measure the distance, but I would have to say it was around a 1/4 mile or so. It was on a railroad bed with a regular snow covered trail. Was around 8980rpm. I'm not good at all at clutching! Once it's close I can get it where I want it. I really don't know what back shifting feels like. The helix in there seems fine. I didn't notice any difference. I talked with you and some other people on here and plenty of shops and dealers, and no one could give me a solid answer. So I just know what they did. I have heard of other people having the same problems as me.

 

[09nytro]

The belt is only a 1/2 in longer , you could shim the clutch so the belt will ride higher and that looks like what they did here.
I'm going to try this or get a gates belt because the stock yamaha belt sucks !

 

[YamahaTim]

The belt is only a 1/2 in longer , you could shim the clutch so the belt will ride higher and that looks like what they did here.
I'm going to try this or get a gates belt because the stock yamaha belt sucks !

Right...only 11mm longer. That's not that much. Let me know if it works for you.

 

[09nytro]

I'm not having rpm problems at all , if I can make it better why not try it that's the fun part of having a sled , try it if it doesn't work then try something else . Right !

 

[TurboJamie]

Tim if you count one one thousand two one thousand etc. to 5 one thousand you should be maxed out. If its not then she ain't right. It should charge so hard to 117 and then pop like a mofo off the limiter. Ours once it hits the limiter only takes 3/4 ish throttle to stay there.

 

[YamahaTim]

Tim if you count one one thousand two one thousand etc. to 5 one thousand you should be maxed out. If its not then she ain't right. It should charge so hard to 117 and then pop like a mofo off the limiter. Ours once it hits the limiter only takes 3/4 ish throttle to stay there.

Well I guess I ain't there, cause I don't here no pop...lol. I might get to 100 or so In that time, but I don't really know. I have never counted. But five seconds or so to 117 that's faster than anything I have ever heard of.

I'm looking at this article. And it says FFP rods, pistons and porting, FFP/Excell turbo, ice age rails and skid hygear suspension diamond S A arms 20,000 dollars of mods and it runs
FX Nytro 4.688 sec. ET, 113.64 mph. Now your saying that yours is just as fast? I'm missing something here!!!

 

[suburban]

thats likely in 660'

 

[suburban]

and far from a trail sled that we have.

 

[TurboJamie]

Tim if you count one one thousand two one thousand etc. to 5 one thousand you should be maxed out. If its not then she ain't right. It should charge so hard to 117 and then pop like a mofo off the limiter. Ours once it hits the limiter only takes 3/4 ish throttle to stay there.

Well I guess I ain't there, cause I don't here no pop...lol. I might get to 100 or so In that time, but I don't really know. I have never counted. But five seconds or so to 117 that's faster than anything I have ever heard of.

I'm looking at this article. And it says FFP rods, pistons and porting, FFP/Excell turbo, ice age rails and skid hygear suspension diamond S A arms 20,000 dollars of mods and it runs
FX Nytro 4.688 sec. ET, 113.64 mph. Now your saying that yours is just as fast? I'm missing something here!!!

I guess i over simplified. I was assuming roll ons. So say you at trail speed inmmy case ill use 60 mph, roll on and count and you should be all over the limiter. From a dead stop around 10 seconds ours is done.

 

[YamahaTim]

Lol...ya think...lol ya I was going around 50-60 when I gave her the berries and on a snow covered trail I got 111 mph. Did not do the count thing. But I would have to say I held wot for at least five sec. Don't know what it would do if I held it longer or on a better surface. But 111mph is the best I have seen.

 

[cannondale27]

Well the 8dn looks good on there and if it works why not! Now go find a Ultimax and try that. Just for giggles I tried the Phazer 8gk which is same length as 8dn. Stock RTX. It would be doable. Bang the rev limiter and over rev all the way up but would easily get a guy home with no adjustment at all. Never would have thought that it would even be doable. Thanks Tim opens up lots of possibilities at least until aftermarket gets us some belts. I feel what you did was basicly switch to lower gearing by using the longer belt. I think you might gain some by using a softer compound belt than the 8DN like the Ultimax and since you are setup for it already might as well give it a try.