99mm700
New member
i have a 01 mm700 with a 151 and i have power inc end dumps pipes. i cant get it to pull on top i have it clutched to run 8500, do i need to add some weight or what? i no theres a set that run 8100 and a set that runs 8300-8500 rpm im at around a 1000 ft elevation and would really like the help to figure it out. need some specs
I can help but i need to know your exact set up right now. Does it start out at 8500 rpm & drops to 8100? If that is the case you have too much tip weight. Sled should come out at 8300 & climb to 84-8500 rpm for best performance.
Mr. Turk -- I'm all ears on this clutching question
I'm a bit confused with clutching my 98 and 99 MM 700s. Here's what I've got:
Sled #1: 1998 Mountain Max - 4300 miles. Overall excellent condition - very well cared for.
Gearing: 40T/22T (stock) 40 links
Track: Yokohama 141" with Mountain Performance rail extension and 8T extroverts. Suspension relocation was performed when upgrading from the stock 136" track - but this probably does not effect clutching...
Altitude: 7500 to 11500 +? feet (Southern Wyoming and Colorado)
Rider Weight: 160
Engine: Mains: #1@127.5, #2@130, #3@130. #60 Pilots on all three. Air Screw @ 2 turns.
Preferred Terrain: Some hill climbing -- mostly playing in deep stuff when it's available.
Note: The sled runs strong -- but seemed to run at high RPMs, probably in the 8500+ range while motoring along from point A to B on the trails, etc... In comparision, it seemed that my 99 MM did not seem to have to work as hard when the two were running side by side. What does this mean? Weak clutch springs? A wild imagination maybe? I honestly don't know...thought maybe you might have some ideas...
Primary: Stock -- has a "Pink" spring installed with one shim. Not sure how long this spring has been in the sled -- but I'm pretty confident that it's due for replacement. Please note: there is only 1 (one) pink mark in the center of the spring -- not a combination of three marks. I am told that the 98 and 99 Mountain Max sleds use a "short" primary spring -- the '00 and later models used a different primary and a longer spring -- if this is true -- then clutching charts for the 2000 and later sleds do not apply to our 98 and 99 machines, right?
Secondary -- stock spring (green) 70 degrees and stock helix. Spring was just replaced with a new one.
Ok -- so here's the question:
This is my son's sled. It is in excellent mechanical condition, despite relatively high miles. No engine work/modifidcations have been performed or required to best of my knowledge. She's pretty much a stock rig. Well, we found a used set of Bender racing pipes for the MM 700 engine. Can you recommend a primary spring and weight configuration that'll work with the Bender pipes? Any other set-up tips would be appreciated (gearing, jets, etc...)
Question two is a little easier:
I need to replace the primary spring on my 99 MM 700 - current one is original as far as I can tell. The sled is stock, similary to the spec. I listed above for the '98, except my all-up weight is more in 210 - 220 pound range. I have a MPI Exhaust can installed -- everything else is stock. Sled has 2200 miles and a Camoplast 144. 20t/40t gearing. Secondary has a new "green" spring installed. Sled seems to run "pretty good" with this combination -- Like the 98, the 99 has the single "pink" mark on the primary -- got any ideas on a winning combination of springs/weights for this sled? If staying with the Pink spring is the way to go, do you have a part number?
If you can shed some light -- maybe point me to some clutch set-up charts for the 98 and 99 MM sleds, I'd sure appreciate it.
I'm a bit confused with clutching my 98 and 99 MM 700s. Here's what I've got:
Sled #1: 1998 Mountain Max - 4300 miles. Overall excellent condition - very well cared for.
Gearing: 40T/22T (stock) 40 links
Track: Yokohama 141" with Mountain Performance rail extension and 8T extroverts. Suspension relocation was performed when upgrading from the stock 136" track - but this probably does not effect clutching...
Altitude: 7500 to 11500 +? feet (Southern Wyoming and Colorado)
Rider Weight: 160
Engine: Mains: #1@127.5, #2@130, #3@130. #60 Pilots on all three. Air Screw @ 2 turns.
Preferred Terrain: Some hill climbing -- mostly playing in deep stuff when it's available.
Note: The sled runs strong -- but seemed to run at high RPMs, probably in the 8500+ range while motoring along from point A to B on the trails, etc... In comparision, it seemed that my 99 MM did not seem to have to work as hard when the two were running side by side. What does this mean? Weak clutch springs? A wild imagination maybe? I honestly don't know...thought maybe you might have some ideas...
Primary: Stock -- has a "Pink" spring installed with one shim. Not sure how long this spring has been in the sled -- but I'm pretty confident that it's due for replacement. Please note: there is only 1 (one) pink mark in the center of the spring -- not a combination of three marks. I am told that the 98 and 99 Mountain Max sleds use a "short" primary spring -- the '00 and later models used a different primary and a longer spring -- if this is true -- then clutching charts for the 2000 and later sleds do not apply to our 98 and 99 machines, right?
Secondary -- stock spring (green) 70 degrees and stock helix. Spring was just replaced with a new one.
Ok -- so here's the question:
This is my son's sled. It is in excellent mechanical condition, despite relatively high miles. No engine work/modifidcations have been performed or required to best of my knowledge. She's pretty much a stock rig. Well, we found a used set of Bender racing pipes for the MM 700 engine. Can you recommend a primary spring and weight configuration that'll work with the Bender pipes? Any other set-up tips would be appreciated (gearing, jets, etc...)
Question two is a little easier:
I need to replace the primary spring on my 99 MM 700 - current one is original as far as I can tell. The sled is stock, similary to the spec. I listed above for the '98, except my all-up weight is more in 210 - 220 pound range. I have a MPI Exhaust can installed -- everything else is stock. Sled has 2200 miles and a Camoplast 144. 20t/40t gearing. Secondary has a new "green" spring installed. Sled seems to run "pretty good" with this combination -- Like the 98, the 99 has the single "pink" mark on the primary -- got any ideas on a winning combination of springs/weights for this sled? If staying with the Pink spring is the way to go, do you have a part number?
If you can shed some light -- maybe point me to some clutch set-up charts for the 98 and 99 MM sleds, I'd sure appreciate it.
For Bender pipes run stock primary spring & weights. Run about 3.6 grams inner & a .8 gram outer. Should run about #62.5 pilots. Main jets around 136.3. Stock gearing is fine after pipes. Primary spring is o-p-o part # 90501-605j5-00; this is the short cover primary spring you need. Unpiped sled should run at 83-8500 rpm. Piped sled likes 85-8800 rpm. Higher rpms will give you better track speed while climbing a long with better backshift.I owned a 97 MM with bender pipes so my info is pretty accurate.
Thanks for the quick reply and information. A couple of questions though --
You recommended jetting at 136.3 -- that sounds very rich for our altitude (8000 to 11000 feet). Much richer than the 130 jets we're running now... Not doubting your set-up, but wanted to confirm with you that this would be correct for high-altitude...
Thanks again for your help.
You recommended jetting at 136.3 -- that sounds very rich for our altitude (8000 to 11000 feet). Much richer than the 130 jets we're running now... Not doubting your set-up, but wanted to confirm with you that this would be correct for high-altitude...
Thanks again for your help.
When you add Bender pipes you gotta go a lot larger on the mains. 136.3 might be just a tad high but it will be very close. Adding pipes really adds power but your fuel consumption goes way down hill also.
Thanks for verifying -- makes sense, more power = more fuel...
Just curious -- how'd you learn all this stuff? All this clutch spring, weight stuff really strains my brain -- it's all P.F.M (pure frikin' magic) to me. My guess is you've had some formal training, or maybe just "School of hard knocks"....??
Anyway -- it's evident that you know your stuff, and I appreciate you sharing the information and advice --
Just curious -- how'd you learn all this stuff? All this clutch spring, weight stuff really strains my brain -- it's all P.F.M (pure frikin' magic) to me. My guess is you've had some formal training, or maybe just "School of hard knocks"....??
Anyway -- it's evident that you know your stuff, and I appreciate you sharing the information and advice --