expert x clearance/rx1

[grader]

i have bought an expert x for my 03 rx1 that i will be extending to 136. aftermarket extensions will allow the use of 8 inch rear axel wheels. is there enough clearance at the back of the tunnel when the skid is fully compressed, eg. landing off a jump? my buddy has a mxz 670 doo with a 121 expert x and he thinks i might have problems, mainly because of the larger 8 inch wheels. my tunnel extension is off a warrior and dosent taper up like some of the aftermarket ones do. anybody running this setup? any thoughts or experience are welcome.

 

[LazyBastard]

Ok. ExpertX and clearance.
This is one point that the guys who designed the skids really didn't pay any attention to. Yes, it WILL hit.

This is what I had to do on mine to make a 144 fit;
1) remove ALL tunnel protectors,
2) modify oem rear heat exchanger to fit snug against aftermarket tunnel extension, this gives the rear about the same as oem warrior tunnel extension,
3) mount the rear bolts 1/2" lower on the tunnel than recommended.

And this is with a DTR, which will limit how far the back wheels will lift in the tunnel.

Granted mine's 4" longer... but that 4" is made up in yours by bigger wheels. Why do you want bigger wheels anyways? They have absolutely no effect on anything.


This is what you do to check clearance;
1) Mount the FRONT directly to the tunnel with the tunnel reinforcements on the INSIDE and NOT ATTACHED.
2) The springs/shocks should be REMOVED and the dynamic stoppers should be turned out of the way.
3) Connect the rear shaft to the rear holes in the reinforcement plate. Don't use the spacers - you'll need clearance for the bolt heads in the tunnel.
4) Transfer to MAX.
5) Push UP on the BACK WHEELS, while allowing gravity to pull the front of the rails down.
6) When it hits, make note of where the rear bolt holes end up in the tunnel - this is the maximum height you can mount them at without it being possible to hit on a hard tail landing.

 

[grader]

i want the larger rear wheels as i believe they are more effecient(faster) than the stock 61/2-7in wheelsthat it comes with. it seems that when these skids are put in yamahas there is little or no speed loss, yet every skidoo ive seen with them in has lost speed.this tells me that the rolling resistance of the pro action is comparable to the xpert x but both are higher than the doo skid. i will also be running 10 tooth drivers as i know for a fact in side by side testing that they are faster in snow. i believe its mainly because it reduces the approach angle about 3 degrees and the increased turning effeciency. i know i will have to remove the front exchanger protectors, as the 11/4 track will not have enough clearance, but i dont run studs so it should be no problem. your saying to mount the plates inside the tunnel and lower the rear mounting hole 1/2 inch. would it not make more sence to drop both holes the same, to maintain correct fitment? thanks for the info lb, keep it coming.

 

[77srxdude]

Putting the Xpert in place of the monoshock definitely reduced the top end on my 05 shorty. I lost 5+ mph.

 

[LazyBastard]

i want the larger rear wheels as i believe they are more effecient(faster) than the stock 61/2-7in wheelsthat it comes with.

Nope. No more efficient. Why would you think it would increase efficiency?

...yet every skidoo ive seen with them in has lost speed.

Breath on a doo funny and it'll loose speed.

your saying to mount the plates inside the tunnel

No, I'm saying to hold it all up on the inside of the tunnel so you can rotate it to determine the optimal placement. It has to be mounted on the OUTSIDE of the tunnel, or you'll need to cut down each of your spacers by 1/8".

and lower the rear mounting hole 1/2 inch. would it not make more sence to drop both holes the same, to maintain correct fitment?

No, that won't work. If you lower the front holes 1/2 inch also, you'll only gain 1/2" of clearance. You need about 3" of additional clearance. That can only be accomplished by lowering the REAR holes by 1/2" and leaving the FRONT ones where they are.

 

[grader]

turning a track , or a conveyor belt, or a chain are all easier around a larger diameter as opposed to a smaller one. since im going to run 10 tooth drivers that are 8 inch diameter, im thinking the rear idlers should match. stock is 7 and 7. as for breathing on doos and slowing them down, thats a serious case of bad breath. my buddys 95 z just went by the gun at 125mph, not much time to breath on it. i understand your mounting instructions and they make sence, and i plan on removing the protectors as well. thanks for the advice LB.