97 vmax sx - Snowmobile World : Your #1 Snowmobile Forum

LinkBack Thread Tools
post #1 of 5 (permalink) Old 01-20-2002, 10:19 PM Thread Starter
Junior Member
Join Date: Jan 2002
Posts: 2
Hi I have a 1997 Vmax 600 twin, it seems to take about 6-8 pulls to start it when it is cold, then when its warm and you restart it after you just turned it off you have to feather the throttle alittle, then it will idle fine, once in a while after riding for awhile shuting it off the restarting about 5 minutes later it will let a back fire out and blow black crap out the exhaust, today it seperated the pipe where it is attached with two springs that go to the Y pipe that goes into the moter, What do I do or check please help.
Miktole is offline  
Sponsored Links
post #2 of 5 (permalink) Old 12-01-2003, 07:59 PM
Junior Member
Join Date: Nov 2003
Posts: 6
my brother had this problem with his v-max.
first thing check the plugs to see if it is running lean or rich.
back firing is usally caused from lean mixture,dirty carbs or also could be dirty fuel filter.
hard starting has to do with about the samething.
check float levels, make sure carbs are in sink,check and make sure choke postions are the same.
pilot airscrew is 2 turns out
float height mm 22.3+-2.0mm
idle speed 1600 rpm
tmkrukow is offline  
post #3 of 5 (permalink) Old 12-02-2003, 06:56 PM
Senior Member
FuzzButt's Avatar
Join Date: Nov 2003
Location: Waterford, Michigan
Posts: 320
I agree.

I have a '97 VMax 600 XTC. It has very similar behavior that clears up after a plug change. I bet the carbs are dirty. I would start there. My machine loves the cold start lever on full when cold starting. 1/2 when starting warm. I have electric start so I can spin it for a few instead of yanking 6 times.

The circuit to check are the pilot air jet. That one is what feeds gas from the float bowl at idle to 1/8 throttle. Being plugged will cause lean condition and backfire.

The TORS could also be malfunctioning or you do not have the proper fuel flow. Cleaning the carbs out should help this.

Now I wish I could tell you how to clean them but I am just learning my self. I am in the process of finding a book on it and then cleaning my other sled's carbs first before I screw with the VMax. I have thought about just taking it to the dealer for cleaning but I would rather not have to part with any money if it is something I can do.

If anyone has hints on how to easily service these TM38 carbs please post ideas.

FuzzButt is offline  
post #4 of 5 (permalink) Old 12-20-2003, 11:54 AM
Senior Member
sno_nuts's Avatar
Join Date: Nov 2002
Location: Central Illinois
Posts: 104
Get a manual and it will walk you trough it. After you do it the first time it's alot easier after that and fyi you don't have to separate the carbs to clean the bowl area and the jets, keep them attached to each other and flip them upside down and do one bowl at a time so you don't get the jets mixed up since usually there is different jetting in each carb to help sync the cylenders together to compensate for temperature, exhaust flow, ect. getting the carbs off and back on is the hard part and the most time consuming, cleaning the bowls and jets are gravy once you get the carbs on the work bench
sno_nuts is offline  
post #5 of 5 (permalink) Old 12-20-2003, 12:47 PM
Senior Member
FuzzButt's Avatar
Join Date: Nov 2003
Location: Waterford, Michigan
Posts: 320
By the way since I posted my reply I have cleaned my TM's. It was a so much easier that I thought. It is something you can do with a few tools.

I have the complete instructions on another post here somewhere. It takes about 2 hours start to finish. I am going to do mine each season. There is no reason a mechanically inclined person can't do this.

Shoot me a PM for more info if you want.

FuzzButt is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Snowmobile World : 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:
Please enter a password for your user account. Note that passwords are case-sensitive.


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

Email Address:


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

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

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