Viper hitting rev lmiter

[Hamie]

Hey I recently purchased a 2015 Viper MTX for this year. It has 900 miles on it. Ive noticed that if you go full throttle at any speed, doesnt matter if you are at a dead stop or going 60 mph, the sled hits the rev limiter. I noticed the clutches have marker on them so im assuming previous owner did some tweaking on stuff. What would I need to change or adjust to improve this?

 

[rallikuski]

I think good start is check is there stock spring and weights in primary clutch. I think you will need more weight or softer spring to get that rpm peaking down...

 

[Hamie]

I think good start is check is there stock spring and weights in primary clutch. I think you will need more weight or softer spring to get that rpm peaking down...

How would I know if they are the factory spring/ weights?

 

[Thunder Products]

How would I know if they are the factory spring/ weights?

The stock springs on Vipers is black with 3 dots on it....Blue/Silver/Blue or Green/Green/Green in that order.

The weights have a number stamped into them which is 8GL or 8BU

Which belt are you running? If it is an 8DN-17641, that could be part of the problem. Stock Viper calls out an 8JP-17641 belt. A lot of people switched to that belt.

If that isn't the case, your clutches could be stuck or not moving freely. We rebuild clutches everyday and seeing a lot of problems with the Viper clutches hanging up and the spyder sliders getting cocked inside, making the clutch not move correctly.

 

[Hamie]

The stock spring is black with 3 dots on it....Blue/Silver/Blue in that order.

The weights have a number stamped into them which is 8GL

Which belt are you running? If it is an 8DN-17641, that could be part of the problem. Stock Viper calls out an 8JP-17641 belt. A lot of people switched to that belt.

If that isn't the case, your clutches could be stuck or not moving freely. We rebuild clutches everyday and seeing a lot of problems with the Viper clutches hanging up and the spyder sliders getting cocked inside, making the clutch not move correctly.

The spring has 3 light green dots. As for the weights im not even sure where they are on there

 

[Thunder Products]

The spring has 3 light green dots. As for the weights i'm not even sure where they are on there

Gotcha Hamie...you have the setup that has caused plenty of problems with the MTX Viper calibration.

Your setup should have the 8BU weights and if you have a Yamaha store there, you can try a Green/Pink/Green Yamaha spring. This G/P/G spring is the same rate, but has less preload and a little less total force. This should keep you off the rev limiter.

 

[2015ViperMTX]

FIRST thing to do check the weights (rivets in primary clutch weights) to see if it is clutched for your elevation!!! If the primary weights are not weighted correctly for your elevation it will hit the rev limiter if is clutched incorrectly. Also check your primary spring color, secondary spring color and secondary spring wrap to see if it is set up to stock specs for your elevation.

use the chart below to check your clutch set up to the elevation you ride

 

[2015ViperMTX]

Here is the Yamaha part numbers for the rivets