Phazer36

Out today with one of my Phazers (88). It wants to run rough much over 3500rpm and did back fire thru exhaust. Here is where I'm at: cleaned carbs, plugs are in right holes,wires and caps good because I tested set on other phazer I have. Chokes looked good. Idles like a champ, shut down and checked plugs, and they are wet and dark brown. I also pulled boost bottle and to me it seemed like lot of standing fuel, but I'm not sure whats normal. I'm thinking carbs are sending too much fuel to the engine, hence either, floats/needles not working properly or wrong jets or combo of both. Oh and TORS are bypassed. What do you think?

__________________

Phazer36

Good time to get this fixed because we have no snow in South Bend. And I didn't make that up!LOLOLOLO

__________________

yamadad4

could be that or the reeds are failing and spitting fuel back into the boost bottle. float level or needle/seat would be more so an issue than jetting unless yours was at one time piped.

checking plugs at idle or allowing fuel to flow will throw off a plugs color. there are standard methods for testing plug color. backfire out the exhaust is sometimes associated with overfueling.

Phazer36

I will pull carbs and double check floats and needles. Seems like overfueling, I never messed with pipes. I will let you know.

__________________

smallengineguy

I was worried about the title of this thread...

__________________
1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-13)
1992 Ski Doo Mach 1 original
2006 Ski Doo MXZ 500SS

Webmaster Evergreen Valley Snowmobile Club
SledNH.com Moderator

JheLrey

What a misleading title!

Did you pull all jets to clean?!?!?

SEG, glad I wasn't the only one!

__________________
Snow: The other white drug!

Phazer36

Geez... can we all just stay focused!LOLOL Some of you have been smelling 2-cycle exhaust too long!

__________________

Phazer36

Can you give me a quick education on the three small openings on the (airbox) side of carbs? What does each one do? And is each a passage?

__________________

Conda2

The middle hole is the Pilot air jet and the hole to the right is the Main air jet.Make sure they are cleaned..

Phazer36

Update, when I got home from work, I pulled carbs and stripped everything off for a good soaking. As I was removing the large center jet that screws into middle passage I found that the one on the left(next to clutch) was not fully screwed in. Them darn back yard mechanics! Maybe two or three turns with screw driver thats it. So... likely to be dumping more fuel than it should if it was properly screwed down tight. Right? So we shall see. While at work I ordered new jets, all the way around. Should have results in a few days.

__________________

Phazer36

Don't you mean passage on the left? The middle and left are open( if seated on sled facing the motor). The right hole doesn't go anywhere, and I checked on a spare set of carbs and they are the same.

__________________

yamadad4

you just found part of your problem. practice on your plugged spare carbs.

all three openings will exit. the center will come out the main, the right will exit the pilot circuit(easier if the pilot jet and the plug cap are off) and the right i recall as simply being a vent. this based on the carbs as your sitting on the sled, like you said.

Conda2

Hope I got that right. Was just reading my Manual. Thanks Yama for your input

Phazer36

Still waiting on jets, found an issue with other Phazer. The Jackshaft bearing behind the clutch is gone, needs replacing. Whats the best way to tackle this one? Can I remove clutch and go at it from that end? Please let me know.

__________________

yamadad4

you can try, but you will be alot happier removing the entire shaft and taking it to the press.

Phazer36

Anyone have a trick to removing bolt on jackshaft? The clutch end. Have tried air tool, and nothing.

__________________

Conda2

You got the brakes set.

Phazer36

Just needed another bowl of wheaties! I got it, and old bearing/ring slid right off. It was easier getting the old crap off than it was the bolt itself.

__________________

Phazer36

Ok so, got the new carb parts and installed. And that would be all new jets. Cleaned again maticulously. But still get coughing and sputtering. Still seems to me that carbs are feeding too much fuel to engine. Plugs are wet and a brown color. I pulled carbs and re-adjusted the float tangs, re-installed but have not run, had to go into work. Would incorrect float level cause this? I'm running out of ideas. Seems to idle fine though.

__________________

kenora

Opps, I misinterpreted the title too

Attached Thumbnails