Helix change

[yukon yamaha]

For me i love to use a 39 or a 41 degree helix, not bad for a quick drag race or playing in the hills

 

[Smelter]

check out these guys
http://pioneerperformance.net/store/page6.html

 

[nytroman20]

Ok, so I'm thinking about just swapping out my rollers for the 14.5s. I'll try that and see how it improves it. Now if it lowers the engagement, will it raise the top rpm? Seeing as its a smaller diameter? Also, will it affect my weight setup? And what's a decent price for these? I found some at 32.95 each. Thanks

 

[axapowell]

Nytroman, sent you a PM. I have a stock Viper helix.

Dave

 

[axapowell]

So from reading this, it appears that a "stock Viper" helix is 47*. Any way to verify that? I'd like to help out, but I don't know what the correct angle is.

Nytroman, I'll just send it to you and you can try it. If it works we'll figure it out from there. I took it off of my Viper at 1100 miles, so it's like new.
Dave

 

[AttakDog]

Ok, so I'm thinking about just swapping out my rollers for the 14.5s. I'll try that and see how it improves it. Now if it lowers the engagement, will it raise the top rpm? Seeing as its a smaller diameter? Also, will it affect my weight setup? And what's a decent price for these? I found some at 32.95 each. Thanks

No it lowers engagement and top rpm. Each sled is different you may have to shim the stock primary spring if your rim's are low. Mine worked better without the shims. The 2 added benefits of the smaller rollers are lower engagement and better belt squeeze. This also helps belt life. That is about average price for the rollers. It does not affect the weight setup

 

[Blue Hornet]

Dumb question, where are the engagement shims located? Is this something you add or are they already there and you adjust by adding or taking out? I dont ever remember shims for the primary.

 

[AttakDog]

Dumb question, where are the engagement shims located? Is this something you add or are they already there and you adjust by adding or taking out? I dont ever remember shims for the primary.

you add the shims, have to buy them. They go behind the primary spring. Each shim raises engagement and top rpm by about 200 rpm

 

[nytroman20]

Ok, so I'm thinking about just swapping out my rollers for the 14.5s. I'll try that and see how it improves it. Now if it lowers the engagement, will it raise the top rpm? Seeing as its a smaller diameter? Also, will it affect my weight setup? And what's a decent price for these? I found some at 32.95 each. Thanks

No it lowers engagement and top rpm. Each sled is different you may have to shim the stock primary spring if your rim's are low. Mine worked better without the shims. The 2 added benefits of the smaller rollers are lower engagement and better belt squeeze. This also helps belt life. That is about average price for the rollers. It does not affect the weight setup

Ok good! As it is now I need to lower them and I'm not sure if the weights alone would have been enough. I hope it squeezes harder cause with the stock yam belt it would revs atleast 300 rpm higher than my ultimax belt. I ordered some for $29.41.

 

[UP bushman]

Yes a Ultimax belt will load the motor a bit more than the stock belt. It will also effect primary weights and rpms a bit. This is why some guys think there sled hits harder out of the hole or corner with stock belt because it slips and grabs due to harder compound.

 

[nytroman20]

I'm aware that the rollers will drop my top rpms but will the helix also drop them? It's not a problem if it does. Would you guys recommend me getting my rpms tight with stock helix then throw the 47 in to see what change it gives me? I'm assuming that's the right way to do it.

 

[UP bushman]

I'm aware that the rollers will drop my top rpms but will the helix also drop them? It's not a problem if it does. Would you guys recommend me getting my rpms tight with stock helix then throw the 47 in to see what change it gives me? I'm assuming that's the right way to do it.

I would put in 47 degree helix and put preload at 90 degrees. A taller helix will require more Preload Rate. Helix change will change characteristics of primary shift out rpm. Then adjust primary for full shift out rpm. I am assuming you have a 43 degree stock helix and you want to put in a 47 degree helix. Good luck lots of variables that will be good setup when you can dial it in.

 

[nytroman20]

Ya I'm still running the stock helix and I'll be putting in the 14.5 rollers. Would this be a good setup for trail riding or is it mostly for racing? And wouldn't raising the secondary to 90 increase rpms and defeat the purpose of putting more load on the motor? Just asking.. I never messed with the secondary, only the primary. I think I'll get it dialed in with the stock helix then throw in the 47 to see what affect it has.

 

[UP bushman]

Ya I'm still running the stock helix and I'll be putting in the 14.5 rollers. Would this be a good setup for trail riding or is it mostly for racing? And wouldn't raising the secondary to 90 increase rpms and defeat the purpose of putting more load on the motor? Just asking.. I never messed with the secondary, only the primary. I think I'll get it dialed in with the stock helix then throw in the 47 to see what affect it has.

Another rule of thumb:
1)Larger helix angle means less belt squeeze faster up shift.
2) Smaller helix angle means more belt squeeze slower up shift.
3) Secondary spring has two purposes. One to provide side pressure (pretension), and secondly to provide (rate). With that kind of power you may experience belt slip.

 

[nytroman20]

That's where I misunderstood! I thought steeper helix would upshift faster therefore having more belt squeeze! Either way I'm gonna have to spend a day trying all this out! Thanks!