WAY too much fuel. - Snowmobile Forum: Your #1 Snowmobile Forum

cporath · 11-20-2012, 08:35 PM

The problems continue.... I finally got my wifes 95 zr 580 (carb) back together, and tried to start it. It is running so rich, that it fouls the plug before it will even start. Every once in a while it will fire, bog, smoke like crazy, and then die out. I can pull it 5 times without firing, and the plugs will be drenched in fuel. I have a 350 main, and a 45 pilot, 1 turn out on air. The only thing I didnt check is needle position. When i bought the sled, the carb switches werent hooked up to anything, and this is the first time I have tried to start it. WOuld these not being hooked up make a difference? I found where there was a splice made in the harness, that may be an attempt to bypass atroubled switch. not too sure though. Any help or input on this matter would be awesome.

smokingcrater · 11-20-2012, 09:01 PM

check the needle... The wiring wouldn't affect that, but a needle clipped far too low could.

cporath · 11-20-2012, 10:35 PM

Thanks for the fast reply. I was under the impression that the needle wouldnt make a difference at idle, so I didnt bother checking, but I will give it a look tomorrow. Another thing I forgot to mention, The only time I can get it to stay running is when it is in full choke. That is the part that doesnt make sense to me.

**RJ Gleason** · 11-21-2012, 06:16 AM

Quote:

Originally Posted by cporath

Another thing I forgot to mention, The only time I can get it to stay running is when it is in full choke. That is the part that doesn't make sense to me.

That tells the whole story right there.

CLEAN the carb!!!

**kccats** · 11-21-2012, 07:57 AM

And the pilot is too big! 35! And set the floats at level with the flange!

JDS · 11-21-2012, 08:27 AM

What altitude are you? A chart I've got for a ZR600 takes a 310 main at 2000 feet. Northern Idaho sounds a lot higher. Check the airbox and exhaust for mouse houses. I had a 550 that would act like that when it had an almost plugged exhaust.

cporath · 11-21-2012, 11:18 AM

Rj- I have been through those carbs 3 times. They are spotless with new jets. Kc- I am thinking this might be part of my problem. The chart I have shows it being a 45, but I am obviously running way too rich. My under hood chart shows 2000 feet at 20-40 degrees being a 340. The elevation at my house 2350 feet. I have 320's and 330's to try as well.

cporath · 11-21-2012, 11:19 AM

How would I go about adjusting the choke planners?

**RJ Gleason** · 11-21-2012, 02:55 PM

Loosen the adjustments at the carb [you need a 12mm and 10mm wrench] making sure that the slugs are dropping all the way into the barrel.
Then take up the slack until you have 1/8" of play with the lever off.

smokingcrater · 11-21-2012, 03:59 PM

Quote:

Originally Posted by cporath

Thanks for the fast reply. I was under the impression that the needle wouldnt make a difference at idle, so I didnt bother checking, but I will give it a look tomorrow. Another thing I forgot to mention, The only time I can get it to stay running is when it is in full choke. That is the part that doesnt make sense to me.

It won't make a huge difference, but it can make some.

cporath · 11-22-2012, 04:17 PM

Last night I tried running 35 pilot jets. checked the needle position and it was set at 2nd clip from full lean. Took the air box and exhaust of and checked for obstructions. And it is still doing the same thing. I did get it to run halfway decent for about a minute before it died and wouldn't restart. I have no idea where to go from here. How do I set the fuel level, and Is that a potential problem?

**kccats** · 11-23-2012, 07:28 AM

Float is likely your problem? With the carb upside down blow into the inlet, and lower the float until it stops flow! That is your fuel level. You want it to be level with the flange!

Grudman · 11-23-2012, 09:25 AM

Sounds like the floats are not set right!

cporath · 11-27-2012, 02:08 PM

So I checked the float level, and they were both set dead level with the flanges. I am convinced it isn't a carb issue. Since the motor was rebuilt, the book calls for a 50:1 premix to be used while breaking in, or while priming the oil lines. I primed the oil lines with a drill before bolting it back on. Is it possible that I am just too oil rich, and that is what I am seeing on the plugs? I was thinking of pulling the oil lines off of the intake, and seeing if that will make a difference. Anybody have any more suggestion?