Pro primary cl. weight 9000ft

[WyoPro]

black/purple should have raised rpms..both low and high since its a stiffer spring, a couple delrin washers under the spring seat should fix the wandering rpms at full throttle, and so far with adding more helix the stock secondary spring cant hold up and its slipping the secondary.. the stock helix doesnt have enough initial angle...and maybe too much finish angle above about 6000 ft. from what testing I have done so far...I would think something in the 60/40/.36 up to about 8000 ft and then drop to a 58/38/.36 up above that..black/purple secondary, and your choice of a belly heavy weight..(11 series, belly busters or slp mtx weights....) would also try a slp blue/pink and green/pink primary spring with that combo as well...thinking might need the green/pink to get the bottom end real snappy again....oh..and so far..8300 pulls best from what I have seen..only problem is its real easy to get a rev limiter bog if you unload the track full throttle on a hill....if you know its gonna do it, and expect it..its not a biggy..performance wise..on back to back test (two identical stock 163 sleds) the one clutched to pull 8100 rpm on a steep deep climb just barely moving at the top (rider looking to start sidehilling or turn out)vrs the 8300 rpm sled which goes over the top with plenty of ground speed , and the rider thinking the hill wasnt even a challenge........

For not being at high altitude you are spot on with what we have found...tried many setups. Always come back to the same one.

 

[AKSNOWRIDER]

For not being at high altitude you are spot on with what we have found...tried many setups. Always come back to the same one.

hows it for hot clutches... the setup I liked the best down here was wicked riding..i mean really good..but the sec is real hot..so i need to work on it..if i can keep the feel while getting rid of the heat..it will be a keeper I think...

 

[WyoPro]

Not too bad but still tinkering with some things....not excessive heat but enough to know there is still a little bit to be gained.

 

[Rick!]

black/purple should have raised rpms..both low and high since its a stiffer spring, a couple delrin washers under the spring seat should fix the wandering rpms at full throttle, and so far with adding more helix the stock secondary spring cant hold up and its slipping the secondary.. the stock helix doesnt have enough initial angle...and maybe too much finish angle above about 6000 ft. from what testing I have done so far...I would think something in the 60/40/.36 up to about 8000 ft and then drop to a 58/38/.36 up above that..black/purple secondary, and your choice of a belly heavy weight..(11 series, belly busters or slp mtx weights....) would also try a slp blue/pink and green/pink primary spring with that combo as well...thinking might need the green/pink to get the bottom end real snappy again....oh..and so far..8300 pulls best from what I have seen..only problem is its real easy to get a rev limiter bog if you unload the track full throttle on a hill....if you know its gonna do it, and expect it..its not a biggy..performance wise..on back to back test (two identical stock 163 sleds) the one clutched to pull 8100 rpm on a steep deep climb just barely moving at the top (rider looking to start sidehilling or turn out)vrs the 8300 rpm sled which goes over the top with plenty of ground speed , and the rider thinking the hill wasnt even a challenge........

Not too bad but still tinkering with some things....not excessive heat but enough to know there is still a little bit to be gained.

X2 on the bold. I have a 60/40 .45 in my P2 and it needs just a little massaging for the next time I go out. Going up to the next spring above 140/200 and probably adding a tooth on the bottom. I agree that between 82-8300 is the happy place for rpms. Gotta be careful, though, as some lighter weight combos makea little rattle that the DET system catches. This might only be a lower elevation issue but below zero days at altitude can get the same result. YMMV

 

[bigtvents]

Any suggestions on which rivets to use in the MTX weights for 6-7000' ?
Have the 60/40 helix, black/purple and blue/pink springs as well.

 

[xc_rider08]

You ran 7k-10k but the highest was 9580?????

excuse me.. i was a lil confusing on my post.. i apologize.. i was told to set up for 7k'-10k' feet and thats what i did(with the blk/prp secondary spring and the 10-60 weights) , and after checking my gps at the end of the trip the hightest elevation i hit was 9580, and i was running at 8250 rpms at that range... sorry for the confusion

 

[kej]

Any suggestions on which rivets to use in the MTX weights for 6-7000' ?
Have the 60/40 helix, black/purple and blue/pink springs as well.

I have 1 alum rivet in outer hole @ 5000ft, with same springs. With the stock 56/42 it runs 8300-8400 with hitting rev limiter. With 60/40 I think you could run alum rivets in both holes.

 

[AKSNOWRIDER]

Any suggestions on which rivets to use in the MTX weights for 6-7000' ?
Have the 60/40 helix, black/purple and blue/pink springs as well.

I would try 3 grams in the belly and 1 gram in the tip...if it hits 8300 good...if not lighten the belly a gram.....watch with 8300 though, it can rev-limit bog on you if you unload the track on a climb....82-8300 seems best performance on the hill so far with what i have tried......

 

[AKSNOWRIDER]

I have 1 alum rivet in outer hole @ 5000ft, with same springs. With the stock 56/42 it runs 8300-8400 with hitting rev limiter. With 60/40 I think you could run alum rivets in both holes.

Kej, from what i have found load the belly, try and keep the tip a gram lighter, these motors just like that midrange load...try 2 grams middle and 1 gram tip and see if it brings you down to 82-8300..if not go 3 belly and 1 tip..or 2 tip...