Outlander 400 HO XT MAX- Idle issue - Can-Am ATV Forum
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post #1 of 13 Old 05-10-2010, 12:44 AM Thread Starter
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Smile Outlander 400 HO XT MAX- Idle issue

Hi All,

I am new at this forum and i just bought my first ATV so i hope you guys can help me!?

My 2007 400 MAX XT has a idle issue, i have to choke the ATV to about 50% to keep it from stalling.
What i have done yesterday is to increase the RPM's to keep it running using the screw on the right side of the ATV (behind the carb?).
It has a higher RPM now, but sometimes the idle increases and decreases by itself which i find strange (without choke).
So what i have checked:

Oil level = OK
Voltage = 12.5 on off and 14.6 when running
Air filter = OK
Spark plug = engine is running so i think it's ok.

I was thinking about cleaning the carb and changing out the spark plug.
Do you guys have any other tips?

Also, how to i remove the spark plug ? (i do not have a wrench that fits)
I did not receive an owners manual with the ATV, is there someone who has a copy for me?

Thanks!
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post #2 of 13 Old 05-10-2010, 05:01 AM
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HyperDevil

Tuning a carb can be an "art" sometimes, it will depend on altitude and gas, just to mention a few. I would definitely do some internet research on your particular carburetor. Could be a dirty jet, sticky slide or needle, crack in the connection between it and engine, again, just to mention a few.

Personally, I'd pull the entire carb and disassemble/clean it, try to find the "original" settings for the jets/needle and go from there.

Although the factory spark-plug wrench works, I'd get a socket type.

07-650-MAX XT
Ricochete ~ Crutchfield 2+1 ~ PRP Stabilizer ~ 25" Bighorn's ~ Kewltek brakes ~ Alumatech Guards
Dalton ~ Fasst bars ~ Cannon/mrrpm oil cooler ~ 10" Rigid LED light-bar + many little "custom" things
Gave to stepson, without a ride for awhile.
ALEX JONES
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post #3 of 13 Old 05-10-2010, 05:51 AM Thread Starter
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Originally Posted by QUADAHOLIC View Post
HyperDevil

Tuning a carb can be an "art" sometimes, it will depend on altitude and gas, just to mention a few. I would definitely do some internet research on your particular carburetor. Could be a dirty jet, sticky slide or needle, crack in the connection between it and engine, again, just to mention a few.

Personally, I'd pull the entire carb and disassemble/clean it, try to find the "original" settings for the jets/needle and go from there.

Although the factory spark-plug wrench works, I'd get a socket type.
Thanks!
I will dis-assemble it and write down / take pictures to know how it was configured.
I have an Mikuni BSR33-49, checked the parts catalog for my ATV.
Is this one easy to clean?

--update--

I have never dis-assembled a carb before, any howto's on how to get it of the engine etc...?

Last edited by HyperDevil; 05-10-2010 at 05:54 AM.
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post #4 of 13 Old 05-10-2010, 06:07 AM
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My only recent experience with a carb, was with my old (04) Arctic Cat 500(I actually got pretty good at that one, with jetting and tuning).

I'm sure others will chime in soon.

I would do some Googling of "Mikuni BSR33-49" , I'm sure there is enough out there, to become proficient and confident with it.

07-650-MAX XT
Ricochete ~ Crutchfield 2+1 ~ PRP Stabilizer ~ 25" Bighorn's ~ Kewltek brakes ~ Alumatech Guards
Dalton ~ Fasst bars ~ Cannon/mrrpm oil cooler ~ 10" Rigid LED light-bar + many little "custom" things
Gave to stepson, without a ride for awhile.
ALEX JONES
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post #5 of 13 Old 05-10-2010, 06:23 AM
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I agree with Quadholic in that it is likley a dirty jet.

Since the choke make the mixture rich I would think that the IDLE fuel jet is partially clogged. Take care when disassembling the carb and make sure you do not change the float level (by bending the tap). I the hose on a carb cleaner can top blow out the jets and sometimes a small copper wire (to keep from scrachign the brass jet) to push throught the jet.

Funny thing is I will probably be doing the same job this week since my bike started to act up also.
Attached Images
File Type: jpg Carb drawing.jpg (53.5 KB, 56 views)

2004 400 MAX
2005 Yamaha Bruin 250
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post #6 of 13 Old 05-10-2010, 06:32 AM
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Once you've taken it off, do plenty of looking at it and thinking, of each function of each adjustment. You will gain understanding and after awhile will be able to diagnose "on the fly" and even fix "on the trail".

Generally you have three areas of function: start/idle/very low speed, mid range and wide open. So you will especially want to be looking for a problem with your "start/idle" circuit.


By all means take your time and learn, the last thing you want to do is take a baggy full-o-parts to your dealer for help.

07-650-MAX XT
Ricochete ~ Crutchfield 2+1 ~ PRP Stabilizer ~ 25" Bighorn's ~ Kewltek brakes ~ Alumatech Guards
Dalton ~ Fasst bars ~ Cannon/mrrpm oil cooler ~ 10" Rigid LED light-bar + many little "custom" things
Gave to stepson, without a ride for awhile.
ALEX JONES
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post #7 of 13 Old 05-10-2010, 06:41 AM Thread Starter
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Quote:
Originally Posted by Flatlander View Post
I agree with Quadholic in that it is likley a dirty jet.

Since the choke make the mixture rich I would think that the IDLE fuel jet is partially clogged. Take care when disassembling the carb and make sure you do not change the float level (by bending the tap). I the hose on a carb cleaner can top blow out the jets and sometimes a small copper wire (to keep from scrachign the brass jet) to push throught the jet.

Funny thing is I will probably be doing the same job this week since my bike started to act up also.
Where do i find the fuel jet on your attached picture?
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post #8 of 13 Old 05-10-2010, 07:45 AM
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I was just looking at that myself. Check out bikebandit.com, look at the exploded view of the carb with the parts identified. Print it out and mark it up before you open up the carb.

Typically the idle circuit i smade up of a small drilled hole in the inlet to the carb (air bypass around the butterfly) and the smallest needle jet.

The top of the carb appears to be the mid & high range (moves with thorttle) needle valve.

Note: I have not opend this carb up yet and am responding based on experience.

2004 400 MAX
2005 Yamaha Bruin 250
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post #9 of 13 Old 05-10-2010, 10:09 AM Thread Starter
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--update--

I pulled the airbox out (what a hassle) en all the tubing connected to it.
Removed the filter + the small one to the idle hose.
Cleaned all the hozes with air and brake cleaner, also the idle intake on the carb has been cleaned with brake cleaner.
Opened the valve to the carb and it is crispy clean in there.
I even ran the engine without any filter at all and the problem is still there.
There was no spitting coming out of the carb on idle or high RPM.
I personally think the carb is OK.

I am going to replace the spark plug tomorrow, there is only 1 ?

I still dont have the owners manual, can anyone help me with that?
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post #10 of 13 Old 05-10-2010, 12:14 PM
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Quote:
Originally Posted by HyperDevil View Post
--update--

I pulled the airbox out (what a hassle) en all the tubing connected to it.
Removed the filter + the small one to the idle hose.
Cleaned all the hozes with air and brake cleaner, also the idle intake on the carb has been cleaned with brake cleaner.
Opened the valve to the carb and it is crispy clean in there.
I even ran the engine without any filter at all and the problem is still there.
There was no spitting coming out of the carb on idle or high RPM.
I personally think the carb is OK.

I am going to replace the spark plug tomorrow, there is only 1 ?

I still dont have the owners manual, can anyone help me with that?
Brake cleaner and rubber/plastic hoses arn't the best of friends. They seam to dry out and crack very quickly after being sprayed.

2004 Outlander 400 HO
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