Carb Tuning? Need Help Please. - Snowmobile Forum: Your #1 Snowmobile Forum
http://www.snowmobileforum.com
Go Back   Snowmobile Forum: Your #1 Snowmobile Forum > Specific Snowmobile Forums > Ski-Doo Snowmobiles


» Sponsors





Reply
 
LinkBack Thread Tools Display Modes
Old 07-06-2010, 07:59 PM   #1 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
Unhappy Carb Tuning? Need Help Please.

Hi, I have a 91 mach 1 that I bought a year ago. The engine is (so I was told from the owner) a 97 617cc rave motor. The guy said that he had put preformance k&n wire mesh air filters in it. I braught it home and it had a minor bogging problem, so I went on to an online micropheche and found out that the stock jets 420 and 400 are still in it. So I went down in size to 340 and 360 and the air gas mixture screw is set at 1&1/2 turns. Any suggestions? Thanks Mack
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-06-2010, 08:15 PM   #2 (permalink)
Vintage Racer
 
Join Date: Oct 2008
Location: NH
Posts: 2,379
I'm assuming the sled is still not running right?
erikrkane is offline   Reply With Quote
Old 07-06-2010, 08:59 PM   #3 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
Yeah it's still not running properly. It still seems to be bogging abit, especially when you tramp the throttle.
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-06-2010, 09:09 PM   #4 (permalink)
Vintage Racer
 
Join Date: Oct 2008
Location: NH
Posts: 2,379
Is the bogging worse now?
erikrkane is offline   Reply With Quote
Old 07-07-2010, 07:05 AM   #5 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
It's better but still very noticable
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-07-2010, 07:59 AM   #6 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
It still does bogg but not as bad as it did.
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-07-2010, 09:20 AM   #7 (permalink)
Vintage Racer
 
Join Date: Oct 2008
Location: NH
Posts: 2,379
Sounds like your still too rich
erikrkane is offline   Reply With Quote
Old 07-07-2010, 09:53 AM   #8 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
But how do I do that? The oil injection is at its minumum setting.
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-07-2010, 10:08 AM   #9 (permalink)
Vintage Racer
 
Join Date: Oct 2008
Location: NH
Posts: 2,379
I'm not exactly too sure but try playing with your mixture screws
erikrkane is offline   Reply With Quote
Old 07-07-2010, 10:27 AM   #10 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
already have and it gets to a point where it wont even start
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-07-2010, 10:35 AM   #11 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
should there olny be one mixture screw?
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-07-2010, 10:55 AM   #12 (permalink)
Vintage Racer
 
Join Date: Oct 2008
Location: NH
Posts: 2,379
Theres 2 screws on each carb, The bigger one is the Idle, are you sure your adjusting the right one?
erikrkane is offline   Reply With Quote
Old 07-07-2010, 11:04 AM   #13 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
is it the little flat headed screw and if you take it right out there is a spring in the hole?
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-07-2010, 12:33 PM   #14 (permalink)
Vintage Racer
 
Join Date: Oct 2008
Location: NH
Posts: 2,379
Yes that would be your idler, it should be the bigger of the two, if you mess with that you will watch your tach go up and down
erikrkane is offline   Reply With Quote
Old 07-07-2010, 12:46 PM   #15 (permalink)
Registered User
 
Join Date: Feb 2005
Location: Near North Ontario anada
Posts: 71
Hi there Mack, here is my 2 cents.

if you have more free flowing carb filters/tubes on it, id say you want richer /bigger main jets in it not smaller, or it will lean out in the top end as it gets more Air than a stock filter/airbox set up.

rememeber that the Main jet really only takes effect by the time the throttle is between 3/4 to Full open.

Prior to that the pilot jets, needle jet/jet needle etc are responsible for the mixture the carb is feeding the cylinders at different phases of the throttle being opened.

have you:

1) started with a basic good cleaning of the carbs
2) as part fo step 1 check the pilot jets are very clean, and the right size for the mods you have
3) consider putting the stock jets or bigger back in
4) check that the jet needle, needle jet, throttle slide etc are all the right ones (easy to do if your cleaning the carbs, just write the numbers down and check online (likely ok but easy to eliminate as a problem)
5) is the clip on the right notch of the needle?
6) are the carbs synced properly lifting both slides at the same time? are both slides starting at the same rest position
7) etc etc. just check to see if its all "to spec" and clean clean clean


does it bog in the first 1/4 throttle or the mid 1/4 to 3/4 or in the last half ? that may help direct you to the problem

do you have the stock air box to try ?

is the exhaust correct for that motor? you mentioned it had a motor swap. Also, did the Carbs on it come from the original sled and motor ....or..did they come with the swaped motor ? Strange and irritating things can occur if you have the carb/exhusts setups intermixed with a different motor. you could spend all kinds of time chasing issues trying to get it to run right if these have been intermixed. If the carbs AND exhaust came off the 97 617 that would be best. if either the carbs or the exhaust or both cam of the original engine that "Could" be part of your issue.

is it possible you have a mouse nest in the exhaust ?

choke or primer on that sled ? if primer, is it feeding extra fuel ? if choke is it seating properly, did you clean the plungers ?
__________________
2011 MXZ TNT 600 ACE
02 MXZ 700 heritage
03 MXZ 550f
95 Yam VMAX 4 800
94 Mach 1 670
82 Yam SS440
81 Yam SRX440
80 Motoski GPS
79 Skidoo rv blizzard 7500+
79 Skidoo rv blizzard cross country
78 Skidoo RV 340
76 Skidoo RV 250
79 Motoski Super Sonic
79 Kawi 440 Invader
91 Arctic Cat 550 EXT special

Last edited by Dave; 07-07-2010 at 01:21 PM.
Dave is offline   Reply With Quote
Old 07-07-2010, 01:57 PM   #16 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
Thanks for giving me a list of things to check for. The throttle pin is set at the second notch (always have been) the boging starts as soon you start on the gas but catches up around mid throttle and takes right off. I dont have the stock air box it was never given to me and Im not to sure if those are the stock carbs or not. the carbs have been cleaned many times. Not to sure about the exhaust the exhaust is the stock system but I dont even know if it is a newer motor or not cause the owner did lie to me about a couple of times saying that sled will do 168mph. Primer does not feed extra gas. Let me know what you think. Thanks Mack
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-07-2010, 02:32 PM   #17 (permalink)
Registered User
 
Join Date: Feb 2005
Location: Near North Ontario anada
Posts: 71
well...if its bogging inthe first 1/4 throttle, that tells me its not your main jets (put them back to the 400/420s).

when you cleaned the carbs did you unscrew/pull the pilot jets and check they were clean and the all the flute holes were clean etc ?

Id still go thru the list of things to check per my last post, including pulling the exhaust off to see if there may be sign of past life inside.
__________________
2011 MXZ TNT 600 ACE
02 MXZ 700 heritage
03 MXZ 550f
95 Yam VMAX 4 800
94 Mach 1 670
82 Yam SS440
81 Yam SRX440
80 Motoski GPS
79 Skidoo rv blizzard 7500+
79 Skidoo rv blizzard cross country
78 Skidoo RV 340
76 Skidoo RV 250
79 Motoski Super Sonic
79 Kawi 440 Invader
91 Arctic Cat 550 EXT special
Dave is offline   Reply With Quote
Old 07-07-2010, 04:08 PM   #18 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
wait so there are different size piolet jets?
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-07-2010, 04:10 PM   #19 (permalink)
95' Polaris Storm 800
 
XPolaris4LifeX's Avatar
 
Join Date: Dec 2009
Location: Ontario, CA
Posts: 103
oh and ya I actully cleaned it out with a pin and it apears to running verry rich, Lots of blue exhaust.
__________________


Current Sleds:
1999 Polaris Indy SuperSport 550 F/C
1995 Polaris Indy Trail Deluxe 500 F/C
1994 Polaris Indy 500 F/C w/ Custom Long-Track



Past Sleds:
1995 Polaris Indy Storm 800
1994 Polaris Indy XLT 600

1993 Ski Doo Mach 1 670
1991 Ski Doo Mach 1 617

1990 Arctic Cat Wildcat 650
1989 Polaris Indy 650
1980 Ski Doo Everest 500E
1980 Ski Doo Citation 377

1973 Ski Doo TNT Silver Bullet w/ Polaris 440 - K.I.A.
1971 Bombardier Olympique 377 AND MORE..
XPolaris4LifeX is offline   Reply With Quote
Old 07-07-2010, 05:03 PM   #20 (permalink)
Super Moderator
 
RJ Gleason's Avatar
 
Join Date: Feb 2005
Location: Groton NY
Posts: 32,061
Of course it will be running rich, it's jetted for cold weather.
Tuning now is a waste of time, you will just end up redoing it in the fall.
Clean the pilot jets ( a fine wire works best ) and leave it at that until it's cold enough to rune properly.
__________________
Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


Worshipful Master; F&AM Dryden Lodge# 472
http://www.masonicdryden472.org/

Rules of this forum are strictly enforced!
RJ Gleason is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 10:09 AM.



Copyright SnowmobileForum.com

Search Engine Friendly URLs by vBSEO 3.6.0