MSRXRider
New member
So my brother wants to put a 151 track on his mm700. Wants to go back 3" then add extensions to the rails. What are the measurements other the 3" back on all mounting holes? Plus how long of a extension? Thanks
whats the theory behind a 3" move? not really anything to be gained by that except for a headache in my opinion.
best way to achieve the stretch to 151 is to move the skid back around 9" and move the front pivot arm forward on the rails about 4.5", plus a few other alterations. this will set the skid more like the 2000 and up mtn sled geometry and reduce the approach angle considerably. from there you will need 141-151 rail extensions and a tunnel extension along with accessories similar to the mtn max or mtn viper.
best way to achieve the stretch to 151 is to move the skid back around 9" and move the front pivot arm forward on the rails about 4.5", plus a few other alterations. this will set the skid more like the 2000 and up mtn sled geometry and reduce the approach angle considerably. from there you will need 141-151 rail extensions and a tunnel extension along with accessories similar to the mtn max or mtn viper.
MSRXRider
New member
I have a 99 mm 700 that the previous owner moved back 3" and put a 141" track on it. I put a 151" track with extensions on it. The front pivot arm was not moved that I could tell. If it would make a difference on it I would move it, but I'm not sure which way to move it. My brother liked the way it rode so that's the idea with the 3" move. To copy mine. I know I could just go out and measure the mounting holes,but I thought I would ask just in case there is a better way. His 99 has a 136" track. Isn't 9" back plus extensions a little to much for a 151" ?
if that works and hes happy, go with it. some simple math would work for your extension calculation.
moving the skid back the 9" is only part of the equation. this sets the skid in the 2000 and up position. the other part of the move is relocating the skids pivot arms forward on the rails.
so even though the 9" seems excessive, your moving the rails themselves almost half that distance forward to reduce approach angle. in essence, similar to moving 4.5" with a much better outcome.
moving the skid back the 9" is only part of the equation. this sets the skid in the 2000 and up position. the other part of the move is relocating the skids pivot arms forward on the rails.
so even though the 9" seems excessive, your moving the rails themselves almost half that distance forward to reduce approach angle. in essence, similar to moving 4.5" with a much better outcome.
MSRXRider
New member
So all mounting holes back 9" and the rails forward 4"? What's the measurements from the top of the tunnel? I might try this with mine because if I remember right the back of my 151 track is off the ground a bit
i would have to dig out my notes, but off of memory, your only moving the front arm mount apprx the 9" back from the stock hole. the center and rear only move back 4". its the altering of the front pivot at the rails that makes the approach angle.
be in touch.
be in touch.