Meizlern
New member
Hi guys, just got a new "old" snowmobile. This is a Yamaha MM700, it's mounted PSI triple pipes but the "nozzle" is original. Whitch size on the "noozle" would be best for getting maximum of power out of this pipes?
Sorry for bad english, needed a bit help from google translate.
Sorry for bad english, needed a bit help from google translate.
This is close to what I had in a sled that I had psi on If I remember I had 145 in all carbs for mains
http://www.totallyamaha.net/forums/...elp-needed-please&highlight=psi+pipes+jetting
http://www.totallyamaha.net/forums/...elp-needed-please&highlight=psi+pipes+jetting
You run the stock nozzles with those pipes. q-8/q-4/q-4
pilots--45
fuel screws -3 turns out at 0- 3000 ft,-2 turns out at 3- 6000 ft and 1-3/4 turns out at 6- at 10000 ft.
slides are stock
needles are 0-3000 ft- 3/4/4 pos. 3-6000 ft- 2/3/3 and 6- 10000 -1/2/2 pos.
Main jet 0- 3000 ft-142.5/ 142.5/142.5, 3-6000,-137.5/137.5/ 137.5 and 6-10000 are-132.5/132.5/132.5.
these are pretty well tested specs. and are good to -10 degrees
cluthing for MM 6- 10000 ft
8ch weights with 3.1 g inner hole and .8 outer
w/s/w primary
sec. spring /green
52/42 helix
60* twist
9000 rpm
pilots--45
fuel screws -3 turns out at 0- 3000 ft,-2 turns out at 3- 6000 ft and 1-3/4 turns out at 6- at 10000 ft.
slides are stock
needles are 0-3000 ft- 3/4/4 pos. 3-6000 ft- 2/3/3 and 6- 10000 -1/2/2 pos.
Main jet 0- 3000 ft-142.5/ 142.5/142.5, 3-6000,-137.5/137.5/ 137.5 and 6-10000 are-132.5/132.5/132.5.
these are pretty well tested specs. and are good to -10 degrees
cluthing for MM 6- 10000 ft
8ch weights with 3.1 g inner hole and .8 outer
w/s/w primary
sec. spring /green
52/42 helix
60* twist
9000 rpm
Meizlern
New member
Thanks both of you, 145 nozzle.. i will try..
Sorry yammy, but i didnt understand very much of that
which part didn't you understand?
let me simlify'
pilot 45
fuelscrew 3 turns out
slide 3.5 (stock)
nozzle Q-8/Q-4/Q-4(pto/mid/mag)
needle 3rd/4th/4th,Pos
main jet 142.5/142.5/142.5 (pto/mid/mag)
this is for
0-3000 ft elev.
for 3- 6000 ft
pilot 55
fuel screw 2 turns
stck slide
stock nozzles
needles 2nd/3rd/3rd/ pos (pto/mid/mag)
mains 137.5/137.5/137.5
for 6-10000ft
pilot 62.5
fuelscrew 1 3/4 turns out
stock slides
stock nozzles
needles 1st/2nd/2nd
mains 132.5/132.5/132.5
pilot 45
fuelscrew 3 turns out
slide 3.5 (stock)
nozzle Q-8/Q-4/Q-4(pto/mid/mag)
needle 3rd/4th/4th,Pos
main jet 142.5/142.5/142.5 (pto/mid/mag)
this is for
0-3000 ft elev.
for 3- 6000 ft
pilot 55
fuel screw 2 turns
stck slide
stock nozzles
needles 2nd/3rd/3rd/ pos (pto/mid/mag)
mains 137.5/137.5/137.5
for 6-10000ft
pilot 62.5
fuelscrew 1 3/4 turns out
stock slides
stock nozzles
needles 1st/2nd/2nd
mains 132.5/132.5/132.5
nelsonhouse
Member
i have psi pipes. i agree with yammy. i'm at 800ft.
i jet for 0-3000ft and it works for my redhead.
pilot 45
fuelscrew 3 turns out
slide 3.5 (stock)
nozzle Q-8/Q-4/Q-4(pto/mid/mag)
needle 3rd/4th/4th,Pos
main jet 142.5/142.5/142.5 (pto/mid/mag) and when it gets colder main jet 143.8/143.8/143.8 pto/mid/mag
this is for
0-3000 ft elev.
Meizlern
New member
Thank you, now i understand a bit more. Could you explain to me what "slide" and "pilot" is, maby it helps with pictures. Thank you again for sharing your knowledge with me
chris700readhead
Member
Different sleds have different slides there just telling you that your stock slides are fine. Pilot is the pilot jet it is the jet that controls idle up to 1/4 throttle. in my opinion I would step up to 47.5 pilots its usually a standard that more than two turns on your pilot to go up a size.