S
stingray719
Well-known member
After the 8DN belt and my clutch kit our Red Viper did over 800 miles with no belt dust and same 8DN belt. My blue Viper is all set but has no snow time to speak of yet.
Info for belt issue here,
http://www.ty4stroke.com/threads/losing-rpm-and-not-holding-normal-top-speed.126678/
From Ulmer Racing page note the 8DN performance, or if both these sources are wrong just do what DPG says.................
SR Viper Stage 1:
•Super Tip Weights
(Setup to your rider weight, track height, and riding style)
•Primary Spring
•Secondary Spring
•Custom Cut Helix
•$400 plus shipping
This kit can be adjusted for lower, smoother engagement, or a higher more aggressive engagement all depending on what you the customer wants!
Our "standard" settings will keep engagement nice at around 3800 rpm and very smooth and easy engagement for all around trail performance. The kit will increase acceleration, faster backshifting, and 1-2 mph gain on top end. It will also maintain RPM better when playing off trail as well.
This kit is very adjustable and can be easily adjusted for the future add-ons of an exhaust, intake, or even turbo.
NEW INFORMATION 3/20/2014
I will share what I have tested and what I have found using the RTX/LTX models as a testing reference.
1. 8JP belt with stock clutches will be limited to approximately 93-95 mph.
2. 8DN belt with stock clutches will be limited to approximately 103-105 mph.
3. 8DN/8JP belt with secondary setup properly will allow you approximately 113-115 mph. ***This is the option for naturally aspirated SR Viper models***
4. 8DN belt with both primary and secondary setup to match the belt properly will allow you approximately 120-121 mph. ***This is the option for turbo SR Viper models***
The stock secondary setup with the 8JP belt will stop your belt approximately 3/8" to 1/2" below the top of the primary clutch due to two reasons, the stock secondary will stop shifting at that point and this stops the belt from going any higher in the primary as well.
Now if you install an 8DN belt you can get the belt to approximately 5/16" from the top of the primary and gain some top speed in the correct conditions.
Stock secondary clutch travel is approximately 0.870" and after setting up the secondary properly you can achieve just slightly over 1" of travel (1.008").
Stock primary clutch travel is approximately 1.104" of travel and after setting up the primary properly you can achieve 1.317" of travel and get the belt all the way to the top of the primary clutch, leaving no clutch face surface unused, in the correct conditions.
We will offer primary & secondary machining/setup process for those that are interested. You can purchase a clutch kit to match it or if you already have a Ulmer Racing clutch kit I will modify it to work properly as well. If you want to continue to use your own clutching, but want the clutches machined properly with some advice on how to setup your helix/spring I can do that as well.
Info for belt issue here,
http://www.ty4stroke.com/threads/losing-rpm-and-not-holding-normal-top-speed.126678/
From Ulmer Racing page note the 8DN performance, or if both these sources are wrong just do what DPG says.................
SR Viper Stage 1:
•Super Tip Weights
(Setup to your rider weight, track height, and riding style)
•Primary Spring
•Secondary Spring
•Custom Cut Helix
•$400 plus shipping
This kit can be adjusted for lower, smoother engagement, or a higher more aggressive engagement all depending on what you the customer wants!
Our "standard" settings will keep engagement nice at around 3800 rpm and very smooth and easy engagement for all around trail performance. The kit will increase acceleration, faster backshifting, and 1-2 mph gain on top end. It will also maintain RPM better when playing off trail as well.
This kit is very adjustable and can be easily adjusted for the future add-ons of an exhaust, intake, or even turbo.
NEW INFORMATION 3/20/2014
I will share what I have tested and what I have found using the RTX/LTX models as a testing reference.
1. 8JP belt with stock clutches will be limited to approximately 93-95 mph.
2. 8DN belt with stock clutches will be limited to approximately 103-105 mph.
3. 8DN/8JP belt with secondary setup properly will allow you approximately 113-115 mph. ***This is the option for naturally aspirated SR Viper models***
4. 8DN belt with both primary and secondary setup to match the belt properly will allow you approximately 120-121 mph. ***This is the option for turbo SR Viper models***
The stock secondary setup with the 8JP belt will stop your belt approximately 3/8" to 1/2" below the top of the primary clutch due to two reasons, the stock secondary will stop shifting at that point and this stops the belt from going any higher in the primary as well.
Now if you install an 8DN belt you can get the belt to approximately 5/16" from the top of the primary and gain some top speed in the correct conditions.
Stock secondary clutch travel is approximately 0.870" and after setting up the secondary properly you can achieve just slightly over 1" of travel (1.008").
Stock primary clutch travel is approximately 1.104" of travel and after setting up the primary properly you can achieve 1.317" of travel and get the belt all the way to the top of the primary clutch, leaving no clutch face surface unused, in the correct conditions.
We will offer primary & secondary machining/setup process for those that are interested. You can purchase a clutch kit to match it or if you already have a Ulmer Racing clutch kit I will modify it to work properly as well. If you want to continue to use your own clutching, but want the clutches machined properly with some advice on how to setup your helix/spring I can do that as well.
