2008 Nytro MTX w/ MBRP hitting rev limiter

[kmanovich]

Hey Guys,

Been trolling the forums for a bit, figured I should make an account and post up since it seems like a decent place for advice.

Couldnt find anything (if anyone else can then please point me in that direction) on the forums where someone had the same problem

Here it is,

I have a 2008 Nytro MTX with an MBRP Pipe. Stock everything else. 4800 kms (appx 3000 miles). When riding I seem to hit the rev limiter quite easy (bounces around 9300 rpm). If I stay under or near the half throttle point the sled pulls hard and strong until about 120-130km/h. Anything over half throttle and it will bounce off the rev limiter. The ODD time, it will even limit my speed to about 95-100km/h. This is primarily on trails and open fields. Deeper snow doesnt seem to have this issue AS MUCH, but it still happens (maybe because I am on and off the throttle more)

Has anyone else had, or heard of an issue like this? I dont know if it has to do with the MBRP pipe or not because the sled came with the pipe. I do have the stock pipe that I could give it a test with to see if it will still do it. However I have been doing a little thinking, some things that come to mind to fix the issue are

A: Get a slightly looser spring to let the primary grab the belt harder and earlier into the RPMs therefore reducing the top RPM and stopping the limiter.
B: Get heavier weights which will do similar to A
C: put a spacer into the secondary which will help drop the belt into the secondary a little sooner lowering the overall RPM of the machine.

What would you recommend doing as a first check? Anyone else have any other suggestions before I start taking off clutch components?


Cant wait for some great advice!!


Thanks

 

[kennyspec]

What rivets are in the weights? What elevation do you ride? Lets start with that info.

 

[kmanovich]

Whatever the stick setup is for rivets. I'm riding around 500m.

 

[kennyspec]

Are the rivet holes full or empty in the weights? You may need to add heavier rivets to the weights.

 

[nitris223]

You will probably end up with the weights loaded . I think mine are 17.2 solid in the tip, 17.2 solid in the mid and 17.2 hollow in the heel. On a fresh groomed trail I can still hit the limiter.

 

[kmanovich]

Holy crap, Nitris...you are from Yorkton too?? what are the chances of that.

I have to check on the rivet holes when I get home.


Edit: Looks like the stock setup is empty rivet holes for an 08 MTX. I might stop by local dealer and grab some and get them in see how it changes.

 

[nitris223]

Just talk to the guys at Schrader's and tell them what you have. Harley told me what rivets I needed and that's what I am running right now. Empty weights are for the mountains.

 

[kmanovich]

Went ant got the recommend rivets for our altitude. Hope to get them installed tonight and go for a little rip to make sure that its right.

Thanks for input guys!! Will post up once I test it out!

 

[kmanovich]

110% better. Pulls long and strong right around 9k rpm. Easy install.

Thanks for pointing me in the right direction. No more spitting and sputtering. Can't wait for the weekend.