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MODIFICATION INFORMATION FOR MY
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 | YAMAHA GYT / POWER INC. PIPES: Normally I hate aftermarket pipes, but Yamaha really has hit pay dirt this time. The pipes operate at stock RPM (8200) and very few clutching modifications were required. See my 97 MM700 Setup Page. All aftermarket pipes are different and none (that I've seen) work as well as the Yamaha setup. There are two different types of Yamaha pipes, an early production set and a late production set. I have used both types (one set on my sled and one on my brothers), and both appear to work exactly the same. The late production pipes are much easier to install. You can identify them by the installation instructions: the early pipes have about 7 pages and the late production have 1 page. Jetting was impacted by about one jet size. I didn't have to jet, because I was a little rich w/o the pipes. THESE PIPES REALLY WORK WELL! After installing a set, I raced my 1998 Mountain SRX (which has about 35 more stock horse power than the MM700). It's a close race now. Before the pipe installation, it wasn't even close. I didn't like riding my MM700 last year because its power was not comparable to my VMAX-4. The pipes make this a completely new sled! If you've got a MM700, you've got to get these pipes!! Contact Mountain Performance at (888) 649-4609 or www.MounatinPerformance.com |
| MOUNTAIN PERFORMANCE 2000 UPDATE KIT: We finally have a way to get our 1997-1999 Mountain Max or Mountain SRXs up on top of the snow instead of trenching through it. Mountain Performance’s Year 2000 update kit provided me the same functional improvements that are featured on the new 2000 Mountain Max. The kit included conversion to a 141" track (for a larger footprint and better powder flotation) and by relocating the rear suspension my approach angle was reduced from 29 degrees to 17 degrees without the use of rail extensions, welding is not required. The kit boasts "at home installation" and I dit it "at home" without any problems. It included everything from template & tunnel extension to rivets & brackets. I even got to retain my stock rear bumper without any cutting. Contact Mountain Performance at (888) 649-4609 or www.MounatinPerformance.com |
| USI TUNNEL WIDE SKIS: The only thing positive I can say about Yamaha's new for '98 plastic ski is that you get a free USI mount. It's true anything is better than those old metal monsters, but I've been riding on USI Tunnel Wides since they came out in late 1994, I guess I'm spoiled. The 1998 Yamaha Ski (custom make by USI for Yamaha) is shorter than a standard USI ski. It's 5-1/2" wide (same as a standard USI Ski. The wear rods are not the standard USI pattern, and Yamaha was a little skimpy on the carbide. I purchased a set of Tunnel Wides (mounts and bottoms in Yellow), a set of 10" carbide runners and a pair of those new adjustable from handles. If you've got a '98, the mounting plates on the Yamaha skis will for fine. I adjusted the ski tip up as much as possible. These really helped the steering on the hard pack and they float great in the powder. It's my opinion that it's easier to side-hill with the wide skis as well. Good skis MAKE A HUGE DIFFERENCE! Contact Mountain Performance at (888) 649-4609 or www.MounatinPerformance.com |
| CAMOPLAST TRACK: I upgraded my stock 1.5" Yamaha track with a Camoplast Challenger 2" x 136". I was shocked. The Challenger far out performed the Yamaha Track. The Yamaha track is made by Camoplast, but to Yamaha's design. I would highly recommend changing tracks if you ride the powder! The results were amazing, I can out climb an equal sled with a Yamaha track by a bunch! After looking into it, I found that Challenger has almost 25% more cleat width per square area of track! The cleats are also wider than Yamaha's. I'm now running the 141" Camoplast. Contact Mountain Performance at (888) 649-4609 or www.MounatinPerformance.com |
| WEIGHT TRANSFER RODS: When I got my Mountain SRX, there was almost zero Ski Pressure. The sled was factory setup with Hill Climbing in mind. They had released the adjusting strap on the front suspension all the way. I liked the powder performance, but the roads were impossible. I knew from last year that years MM700 that Adjustable Weight Transfer Rods would do the trick. I used the Bender Racing adjustable rods last year. I learned the the Bender rods don't allow you full suspension travel on the Mountain sleds (11.5"). I am now using the Maxximum Performance Hand Adjustable "Quick Rods". The ride is improved over the Bender rods. When in the powder, I set them at 6 or 7 turns. This results in a very light front end. When on the road I use 2 turns. 3 turns is stock on a MSRX. Contact Mountain Performance at (888) 649-4609 or www.MounatinPerformance.com |
| YAMAHA MSRX SHOCKS: I liked the ride of my MSRX so well, I thought I would upgrade the MM700 to Pro Link-X rear suspension. The big difference being the shocks. I ordered shocks from the 98 MSRX (center and rear). I used the new rear spring set at the stock height (14.5") and used the stock MM700 center spring set and maximum compression. The SRX has a much larger center spring to carry the weight of the SRX. The MM700 doesn't need it. This is a GREAT UPGRADE. Boy, what a ride. You'll need to order 4 nylon spacers off the MSRX for the read shock also. For good measure, I also added the Maxximum Performance Quick Adjusters. Contact Mountain Performance at (888) 649-4609 or www.MounatinPerformance.com | ||||||||||||||||||||
| HYMARK ROLLER CLUTCH - A NEUTRAL EXPERIENCE: In the past, I've had good luck with Hymark Roller Secondaries. Not this time it was so, so! I spent several days looking for the right combo, but never found one that was a lot better than the Yamaha parts (with modifications). Hymark had its good points and Yamaha had its good points. I tried a 45deg and a 47.5deg Helix, I tried three of the four Hymark long springs. I was, of course, able to get the excellent backshift that everyone associates with rollers, but could never get a fast enough upshift with the 45deg helix. I focused on the 47.5deg Helix. The stiffest long spring (Blk/Wht) really raised my rpms and the upshift was poor. The Blk/Blu long spring was a little soft on backshift. The second to stiffest long spring (Blk/Yel) had an OK upshift and good backshift. On my old MM700 I used the 47.5 deg helix with the long Blk/Yel spring, this sled still doesn't shift out as well (top end speed) as the stock Yamaha clutch, but backshift and belt tension are better than stock. RPMs are good (similar to a stock setup). I collapsed the Blk/Yel spring a a vice overnight to try and improve the shift out, it helped a little. Anyone with a long Hymark spring should do this! On my new MM700 I decided to not spend the money on the Hymark and haven't been disappointed yet. See Secondary Clutch Info on my 98 Mtn. SRX Setup Page. | ||||||||||||||||||||
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