How much should I increase my jet size after adding twin pipes?

Alberta Beach Doo

Active member
Joined
Jan 16, 2011
Messages
103
Reaction score
111
Location
Lac St Anne
Just installed a set of PSI pipes on my 97 700 SKS. The pipes I have had forever. The sled I just got. I recall that I should be up about 5-7 jet sizes. I am not changing the reeds or getting a hi flow air box (slp). I am just looking for a base line starting point. Probably get a boost bottle and power packs. Will be doing a lot of plug and piston wash checks. Any input would help.
 

Trashy

Super Moderator
Moderator
Joined
Nov 16, 2008
Messages
130,459
Reaction score
100,436
Location
Fort Macleod
5-7 seems a little extreme....... Do regular plug checks, and I doubt you'll have to go up 2 size's. The ACCS system was good in it's time, and it's very hard to kill that 700. Keep us posted how you made out?
 

Alberta Beach Doo

Active member
Joined
Jan 16, 2011
Messages
103
Reaction score
111
Location
Lac St Anne
5-7 seems a little extreme....... Do regular plug checks, and I doubt you'll have to go up 2 size's. The ACCS system was good in it's time, and it's very hard to kill that 700. Keep us posted how you made out?

I don't believe the 97-98s had the Accs system. That was a elevation compensation that came in on the Gen 2. Sleds like the Vertical Escape had it. It's been a lotta years and a few beers but I am sure my 97 doesn't have it.
 

Trashy

Super Moderator
Moderator
Joined
Nov 16, 2008
Messages
130,459
Reaction score
100,436
Location
Fort Macleod
Then your sled isn't a 97

The 97's did have ACCS, and now come to think of it...... I don't think that the 700 twin came out until late 98
 

rightsideup

Active VIP Member
Joined
May 19, 2008
Messages
3,019
Reaction score
2,831
Location
bc
the 700 came out for model yr 97 with kehin carbs and polaris never did offer there own accs system that was a doo feature
 

pfi572

Active VIP Member
Joined
Mar 10, 2010
Messages
6,063
Reaction score
15,236
Location
Grande Prairie
Start big and work your way down?
Famous last words I thought?
1997 was a strong sled.
If I remember right hey had and different carb than mukuni?
 

rightsideup

Active VIP Member
Joined
May 19, 2008
Messages
3,019
Reaction score
2,831
Location
bc
Start big and work your way down?
Famous last words I thought?
1997 was a strong sled.
If I remember right hey had and different carb than mukuni?
yup kehin hopefully I did not butcher the spelling. I had a teal 97 rmk and 98 xc 700 in 99 my xc had mukuni flat slides.
 

Trashy

Super Moderator
Moderator
Joined
Nov 16, 2008
Messages
130,459
Reaction score
100,436
Location
Fort Macleod
the 700 came out for model yr 97 with kehin carbs and polaris never did offer there own accs system that was a doo feature
I may be wrong with the year of the 700 debut, but the ACCS system was Poo. Doo had the HAC system in 97
 

pfi572

Active VIP Member
Joined
Mar 10, 2010
Messages
6,063
Reaction score
15,236
Location
Grande Prairie
yup kehin hopefully I did not butcher the spelling. I had a teal 97 rmk and 98 xc 700 in 99 my xc had mukuni flat slides.

Yep the teal green rmk?
Drop one jet size and one tooth on top gear and it worked very well.
Had good compression that year .
Next year it didn't run as strong from what I remember .
 

rightsideup

Active VIP Member
Joined
May 19, 2008
Messages
3,019
Reaction score
2,831
Location
bc
Yep the teal green rmk?
Drop one jet size and one tooth on top gear and it worked very well.
Had good compression that year .
Next year it didn't run as strong from what I remember .
yeah high compression and I do not think it made noise standards as well and it may have been tuned down for 98.
 

rightsideup

Active VIP Member
Joined
May 19, 2008
Messages
3,019
Reaction score
2,831
Location
bc
I had a 2002 700 rmk and a 2003 800 vert escape neither had accs
 

Dutchman

Active VIP Member
Joined
Apr 6, 2011
Messages
160
Reaction score
239
Location
Central Alberta
Many moons ago, I had a 98 with Keihin carbs, and PSI twin pipes. Besides the main jet, the pilot jet was also changed to make it run nicer.
I seem to keep all these papers filed away. Here's a jetting and clutching chart that I used and found they were pretty darn close. Only diff was the "needle" was updated in 98. Exactly for your machine and pipes.......hopefully it will give you a better idea..........good luck
 

Attachments

  • psi.pdf
    285.3 KB · Views: 234
  • psic.pdf
    160 KB · Views: 213
Last edited:

Alberta Beach Doo

Active member
Joined
Jan 16, 2011
Messages
103
Reaction score
111
Location
Lac St Anne
Then your sled isn't a 97

The 97's did have ACCS, and now come to think of it...... I don't think that the 700 twin came out until late 98
The Polaris. Built twin 700 came out in 97. The SKS. And RMK had it. The head was purple and the sled was teal with purple graphic. In 98 the head was metal with red diagonal. Markings. That color was used later on the 800 head too. In 98 the sled itself was a deep royal blue. The ACCS. I believe is an altitude compensation system. I will bet you a couple of John Deere. Trail Fires. On this that neither 97 or 98 had the ACCS.
 

rightsideup

Active VIP Member
Joined
May 19, 2008
Messages
3,019
Reaction score
2,831
Location
bc
The Polaris. Built twin 700 came out in 97. The SKS. And RMK had it. The head was purple and the sled was teal with purple graphic. In 98 the head was metal with red diagonal. Markings. That color was used later on the 800 head too. In 98 the sled itself was a deep royal blue. The ACCS. I believe is an altitude compensation system. I will bet you a couple of John Deere. Trail Fires. On this that neither 97 or 98 had the ACCS.
I think all your statements are accurate hope fully

Dutchmans info is what you require
 

retiredpop

Active VIP Member
Joined
Mar 18, 2007
Messages
1,691
Reaction score
5,014
Location
Calgary
The Polaris. Built twin 700 came out in 97. The SKS. And RMK had it. The head was purple and the sled was teal with purple graphic. In 98 the head was metal with red diagonal. Markings. That color was used later on the 800 head too. In 98 the sled itself was a deep royal blue. The ACCS. I believe is an altitude compensation system. I will bet you a couple of John Deere. Trail Fires. On this that neither 97 or 98 had the ACCS.

You are absolutely correct. The ACCS did not come out until 1999 for the RMK600 and RMK700. They used it in 2000 as well on those two motors. In 2001 when Polaris switched to Mikuni flatslides there was no ACCS. The RMK500 used ACCS from 1997 to 1999. SKS did not ever have ACCS.
 

Alberta Beach Doo

Active member
Joined
Jan 16, 2011
Messages
103
Reaction score
111
Location
Lac St Anne
Those 97 were awesome. I put over 5000 miles on it and it ran strong all year. I sold it only because well, it had 5000 miles on it! The 98 was strong as well. Only put about 3800 on it in one season. I got a 04 800 RMK 151 and a 05 XC 800. To me there never ran as hard as the 97-98's.
 

Attachments

  • image.jpg
    image.jpg
    104.3 KB · Views: 188
  • image.jpg
    image.jpg
    107.6 KB · Views: 194
Top Bottom