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Old 10-06-2010, 09:11 PM   #1 (permalink)
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01 mxz 600 Carb. problems?

i have never taken apart my carbs on my sled before and i dont really want to if i can avoid it. i do have a couple of questions though if anyone could help me? first, when i am not on the throttle or the sled is idiling it lets off tear gas. meaning it makes you tear up when standing next to the idling sled. I am not positive but i just assumed that unburned gas going through the combustion cycle was the problem? idk why it not being burnt up if this is the problem? i have not messed with the air mixture screw on the carbs for i wasnt sure if this would solve the problem? if it matters, the carbs were looking good 2 or 3 years ago when the dealer checked them out and i have used some "sea foam" in the system to trying and keep them clean. but honestly i dont even know of the carbs are the problem. anyone have any thoughts?...also it isnt idiling any higher than normal
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Old 10-06-2010, 09:19 PM   #2 (permalink)
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i forgot to mention that after running for awhile(until engine is warm) when i shut off the motor and then start it again within a minute of shutting it off it sometimes backfires.
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Old 10-06-2010, 09:42 PM   #3 (permalink)
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This is from the how to section of the forum


Disassembly and Cleaning of a Mikuni Round slide Carburetor
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Old 10-07-2010, 05:25 PM   #4 (permalink)
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01 mxz carbs

Good question!
My sled almost always backfires after starting when already warm (i.e. - after filling gas)???
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Old 10-07-2010, 07:04 PM   #5 (permalink)
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Possibly weak spark in one cylinder?
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Old 10-07-2010, 08:22 PM   #6 (permalink)
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how old is the gas in that thing?
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Old 10-08-2010, 06:32 AM   #7 (permalink)
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Use the spark plugs as a guide. If they are all black and sooty looking it's too rich.
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Old 10-08-2010, 02:41 PM   #8 (permalink)
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Question: I'm in a somewhat similar situation with my 2000 MXZ 2000 - in that I just took the carbs out to clean them. (My sled was given to me because it ran like junk and needed a track - owner didn't want to get into it). I put the cleaned carbs back in and they run well beyond low idle ...so my question is: How do you efficienttly set the Pilot Jets? You have to take the carbs out and take the float bowl off to access them. I assume they're closed up too much hence wont idle well. (When I have the throttle "on" just a little, passed flat idle, it runs the balls. When I let the throttle lever all the way out it stalls. Again, it's all clean inside, so I figure I need to back out the Pilot Jet screws. Just wondering how to get to optimal setting --- efficiently. Not taking them off, unscrewing a turn or two - on both carbs - reinstalling everything and then running it again. Does this question make sense? Thanks for any help anyone can lend.
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Old 10-08-2010, 05:22 PM   #9 (permalink)
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Turn them in 1/4 turn at a time.
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Old 10-08-2010, 05:46 PM   #10 (permalink)
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Take the carbs off, the float bowls, etc. - turn them a 1/4 turn - put it all back together and see how it goes? That's the "efficient" way to do it? Yikes.
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Old 10-08-2010, 06:45 PM   #11 (permalink)
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No,no, the air screws on the sides of the carbs.
Get it to idle smoothly and then set the idle stop screws for your idle rpm.
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Old 10-08-2010, 07:37 PM   #12 (permalink)
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Thanks RJ - that sounds a lot easier. Forgive my ignorance again (I hope I'm getting better quickly) but is there a post/link/thread that tells you how to put the carb together and "set it" correctly? I followed an earlier post on removal, disassembly, cleaning and reassmebly. Then, after reinstalling, I couldn't get it to stay running - the low idle was "off". That's what prompted my post a few hours ago. I just wonder where everything should go, from the start, in terms of pilot jet, air jet, main jet, etc. I'll go take a look on Youtube but just thought I'd ask.
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Old 10-09-2010, 07:40 AM   #13 (permalink)
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The only adjustable setting on those will be the idle air mixture and the idle speed stop screw. The high and low speed jets are fixed and the only way to change them is to put a different one in.
The needle in the slide is also adjustable, but you rarely change that at all. It is most commonly set on the middle notch and it mainly effects the mid-range.
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Old 10-09-2010, 07:47 AM   #14 (permalink)
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Thanks again. Just to confirm, the Pilot Jet - accessed through the float bowl area underneath - should be screwed in "all the way". Same with the Main Jet right next to it. Adjustment, on the fly if you will, is done with the Pilot Air Jet on the side and (unlikely) the Needle Jet. Is that correct?

Thanks so much.
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Old 10-09-2010, 07:50 AM   #15 (permalink)
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You got it !
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Old 10-11-2010, 02:08 PM   #16 (permalink)
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okay i havent been on for a couple days but i am glad to see that i am not the only one having this this problem (sorry to everyone else in the same boat as me). and thanks RJ and everyone else who commented i am going to try to do some adjusting and cleaning and see what i can do.
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Old 10-11-2010, 02:11 PM   #17 (permalink)
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Quote:
Originally Posted by alexsmudde View Post
how old is the gas in that thing?
and to reply to your comment the gas would be literally brand new for i would gas up at a station (after riding to the station) and when i start the sled it would backfire
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Old 10-11-2010, 02:13 PM   #18 (permalink)
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Quote:
Originally Posted by MXZ600X View Post
Good question!
My sled almost always backfires after starting when already warm (i.e. - after filling gas)???
yesssss! it would backfire after filling up
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