02 MXZ 800 high idle issue - Snowmobile Forum: Your #1 Snowmobile Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 09-25-2008, 05:34 PM Thread Starter
DG
 
Join Date: Sep 2008
Location: Epping, NH
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Post 02 MXZ 800 high idle issue

2002 mxz 800. idles around 3k rpm. carb boots good, no vacuum leaks, cant pin point problem area. any suggestions
DG1350 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 09-25-2008, 05:54 PM
TRH- Troll Raising Hell
 
SMFXRSB's Avatar
 
Join Date: Mar 2007
Location: Plymouth Area, MN
Posts: 6,134
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What exactly have you done to pin point the leaks?

Snow: The other white drug!
SMFXRSB is offline  
post #3 of 10 (permalink) Old 09-25-2008, 06:02 PM
I am Spartacus
 
smallengineguy's Avatar
 
Join Date: Feb 2004
Location: Milton Mills, NH
Posts: 23,804
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is there 1/8" of cable play in the throttle lever? The cable may be too tight, keeping the slides too high.

1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
1992 Ski Doo Mach 1 original
2006 Ski Doo MXZ 500SS
1999 Ski Doo MXZ600
Webmaster Evergreen Valley Snowmobile Club
SledNH.com Moderator
smallengineguy is offline  
post #4 of 10 (permalink) Old 09-25-2008, 09:08 PM
bbbbrrrraaaaapppppp??
 
AvroAero's Avatar
 
Join Date: May 2005
Location: Toronto Ontario
Posts: 1,062
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Mine does something similar. After running at high rpm it doesn't go down to a low idle easily. Like to hover at 3k more. If I fiddle the choke a little I can get it down to idle and it'll stay there. Not as common when warm.




AvroAero is offline  
post #5 of 10 (permalink) Old 09-28-2008, 09:32 PM
Registered User
 
700summitguy's Avatar
 
Join Date: Sep 2008
Location: Onoway,Alberta.
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I can't find the tech sheet,but there was an issue with airflow inside the carb bypassing the flat slide and causing higher idle speed.Sorry,I can't remember what the fix was.I'll keep looking.
700summitguy is offline  
post #6 of 10 (permalink) Old 10-01-2008, 04:27 PM Thread Starter
DG
 
Join Date: Sep 2008
Location: Epping, NH
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by smallengineguy View Post
Is there 1/8" of cable play in the throttle lever? The cable may be too tight, keeping the slides too high.
Thanks. cable adjustment helped!
DG1350 is offline  
post #7 of 10 (permalink) Old 10-01-2008, 09:21 PM
I am Spartacus
 
smallengineguy's Avatar
 
Join Date: Feb 2004
Location: Milton Mills, NH
Posts: 23,804
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Good times.

1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
1992 Ski Doo Mach 1 original
2006 Ski Doo MXZ 500SS
1999 Ski Doo MXZ600
Webmaster Evergreen Valley Snowmobile Club
SledNH.com Moderator
smallengineguy is offline  
post #8 of 10 (permalink) Old 09-20-2009, 02:50 PM
Registered User
 
Join Date: Aug 2009
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
2002 mxz 800

I have the same problems.I have at less 1/8 of space there maybe more but if i put her on 1/2 choke she will idle down but as soon as you give her a little gas and let go she shoots right back yup to 3000 rpm.just wondering if you guys know what to do.I have a 2002 mxz renegade 800.
camz72 is offline  
post #9 of 10 (permalink) Old 09-20-2009, 06:08 PM
Super Moderator
 
BC_Dan's Avatar
 
Join Date: Jan 2004
Location: oregon
Posts: 13,566
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Lots of times, a high idle is an indication of a lean condition in the pilot jet circuit. Sometimes installing the next size bigger pilot jet helps, as does turning the air screws in a bit (or fuel screws out, depending on model of carb...)

If it comes down with the choke applied, and you have ruled out air leaks in the carb boots and a leaky crankcase seal, try the air screws...

2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php
BC_Dan is offline  
post #10 of 10 (permalink) Old 09-20-2009, 08:28 PM
Registered User
 
Join Date: Aug 2009
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
How would ou check for a leaky boot or crankcase seal.do you have to take the carbs off to adjust the air screws
camz72 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Snowmobile Forum: Your #1 Snowmobile Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome