99 Ski-doo mxz 600 running/flooding problems.... - Snowmobile Forum: Your #1 Snowmobile Forum

NEalliance136 · 12-30-2012, 06:30 PM

Ok, so i have searched a bit and haven't found anything on my problem, maybe i missed it. Anyways here is my problem... I have as stated a 99 Skidoo Mxz 600, it had been running great, then after warm it runs like it's a one cyl. And soaks the #2 plug. Cleaned carbs, new fuel pump lines filter, fuel, cleaned tank. Ran great again, then warm, bogs like it's down a cyl. Soaked plug still. Swapped carbs locations for poops and hahas and i have it down to a carb. But, no matter how i adjust, it keeps flooding it out. Suggestions? Needles are both on center clips, carbs are spotless. Floats are appearing to float well... Any help at thus point is a help... I'm at a loss... Then the other night the "good" carb flooded and hydro locked my engine... So lost...

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DitchPklCowboy · 12-30-2012, 06:45 PM

Sounds like jetting issue make sure they are the recommended for your altitude and air temp

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NEalliance136 · 12-30-2012, 06:50 PM

[QUOTE=DitchPklCowboy;529391]Sounds like jetting issue make sure they are the recommended for your altitude and air temp.

Where might i find a table or the sort, that may tell me recommended jets/needles...? Thanks for the thought, sled tuning is new to me

DitchPklCowboy · 12-30-2012, 07:51 PM

Google it for year make model and make sure the carbs are the ones listed!

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NEalliance136 · 12-30-2012, 07:59 PM

Quote:

Originally Posted by DitchPklCowboy

Google it for year make model and make sure the carbs are the ones listed!

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Done exactly that, no luck at all... Everything but the 99-01 600 engines. It's such a pain... Ski doo doesn't have an easy table for use for dummies like myself. Cars, sure no problem. This sled has been nothing but trouble since day one

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DitchPklCowboy · 12-30-2012, 08:47 PM

Okay google mikuni carb manual and download a free one try to match assuming you have mikunis

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DitchPklCowboy · 12-30-2012, 08:49 PM

I had a 96 formula three that was a joy

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NEalliance136 · 12-30-2012, 08:50 PM

Indeed, they are the mikuni carbs, I'll see what i can find, if i manage some results i will be sure to post them

WWTSE670 · 12-30-2012, 09:36 PM

I think the 600 in 99 had dpm that is supposed to adjust float bowl pressure making jetting universal for all temperatures and elevations. Could be an issue with that

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NEalliance136 · 12-30-2012, 09:39 PM

Quote:

Originally Posted by WWTSE670

I think the 600 in 99 had dpm that is supposed to adjust float bowl pressure making jetting universal for all temperatures and elevations. Could be an issue with that

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could you possibly in like me on what this DPM that you speak of is?

**smallengineguy** · 12-31-2012, 06:23 AM

Did the machine run well before this issue? If so, it's not a jetting issue (jetting doesn't change itself!). Either your choke plunger isn't seating all the way or your inlet needle/seat is in need of replacement.

NEalliance136 · 12-31-2012, 09:07 AM

Quote:

Originally Posted by smallengineguy

Did the machine run well before this issue? If so, it's not a jetting issue (jetting doesn't change itself!). Either your choke plunger isn't seating all the way or your inlet needle/seat is in need of replacement.

It did not, though both carbs are now completely torn down. And found 280 Mains and 35 pilots. Which the dealer i called told me is OE. But refused to give me a jetting assistance, but they are happy to help otherwise at 59.99 an hour.

yep, I'll get right on that...

DitchPklCowboy · 12-31-2012, 09:59 AM

Did you clean the jets? If you scratch or mar them in the jet it can change fuel delivery

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**smallengineguy** · 01-01-2013, 07:46 AM

That is the correct jetting. Are your chokes leaking by?

NEalliance136 · 01-01-2013, 09:13 AM

Quote:

Originally Posted by smallengineguy

That is the correct jetting. Are your chokes leaking by?

This is my vote at this point, so i cleaned the carbs again, doubled checked the choke, and I'm not sure exactly what these choke needles are supposed to look like

NEalliance136 · 01-01-2013, 09:43 AM

also a quick question on setting float level... when setting the float level on the round slide Mikuni I'm trying to set the float height as measured from where to where?

**RJ Gleason** · 01-01-2013, 04:45 PM

With the carb upside down, the arms should be parallel with the bowl flange.

**smallengineguy** · 01-01-2013, 06:02 PM

There should be 1/8" of slack in the choke cable before it starts to lift the plungers.

NEalliance136 · 01-02-2013, 01:01 AM

Thanks everyone for your help and input. Final result is new jets and needles, found floats way too high, choke needles replaced and adjusted to specs. Problem solved.

99' Ski-Doo MXZ 600
Mains @ 280
Pilots @ 40
Keene NH
20*F and under.
1.5 turns out on both adjuster screws. Plugs coming out cardboard brown, and finally happy with her.