440 carb question - Snowmobile Forum: Your #1 Snowmobile Forum

Nason · 11-27-2006, 08:16 PM

Hey. I've been goin over the prowler I bought, and tonight I decided to pull the carbs and give them a good cleaning. As I was doing this, I noticed that each of the carbs has an electrical connector/wire on them. Problem is, they are both broken off. Well, one is broken off at the connector on the carb, and the other one has about 6 inches of wire on it, not connected to anything.

I haven't worked on a sled in about 6 yrs, and have no idea what these are for. How important are they to be hooked up, and where??

The sled runs good as it is, except for rotten rubber intake flanges and leaky pipe gaskets... it's in need of a little tlc...

**smallengineguy** · 11-27-2006, 09:30 PM

They are the throttle position sensors, and were an absolute pain in the *ss...There is a magnet in the carb where the slide goes, and the wires picked up on where the slide was in the carb. If the slides were stuck open, there would be no spark. They always had problems with them.

tcat20 · 11-27-2006, 09:45 PM

just take them off the carbs you dont need them like he said they where big problem on older sleds

Nason · 11-27-2006, 09:53 PM

Quote:

Originally Posted by tcat20

just take them off the carbs you dont need them like he said they where big problem on older sleds

This is what I wanted to hear. Obviously a previous owner must've been having the problems with them. I couldn't find the wires they connected to on the sled anyway, and was hoping they wouldn't be an issue. Thanks a bunch!

Nason · 11-30-2006, 10:37 PM

Well I cleaned the carbs out at work, and removed the sensors. Just wondering now what the recommended carb settings are for this sled. This is the first multiple carbed sled I've had since my dad's old 250 Elan when I was a kid, and the needles were way off from each other. It's got a 250 main jet.

we have a litlle snow comin in the next few days (sun- thurs. i think), so I gotta get it back together tomorrow.

BC_Dan · 12-01-2006, 12:56 AM

for the 1990 Prowler

0 feet elevation

Temp(f)/Jet
-40 to -20 260 jet
-20 to 0 250
0 to +20 240
+20 to +40 230

2000 feet

-40 to -20 240jet
-20 to 0 230
0 to +20 220
+20 to +40 210

4000 feet

-40 to -20 220
-20 to 0 210
0 to +20 200
+20 to +40 190

The chart goes on up for settings for 6000, 8000, 10,000 and 12,000 feet, but I didn't include those

Try the air screw one turn out from lightly seated, and when you start to hit the throttle, both slides should start moving at the same time... that will give you a pretty good initial setting.

Nason · 12-04-2006, 10:48 PM

Thanks for the info. It snowed here today, so I got the sled put back together. Put the carbs back in and adjusted as best I could.

I Went for a little spin, it ran all right, but had a bog at low throttle, and kind of a miss/stumble through the rpms. Went about 1 km and it started workin kind of bad. I turned around and headed for the garage, and made it about 15 ft from it and it quit. Started right back up, blip the throttle couple times tryin to get it in the garage and it would quit again. It always started right up on a half pull, but would quit when gassin it. Any ideas what is going on with it?? I do have to pick up a new set of plugs, but it was runnin pretty good before I removed/cleaned the carbs.

Help me please!!

**RJ Gleason** · 12-05-2006, 02:01 AM

clogged jets??

mmrosshere · 12-05-2006, 02:28 AM

Quote:

Originally Posted by Nason

but it was runnin pretty good before I removed/cleaned the carbs.

If it aint broke then we must fix it

Sorry had to send that one out. I been told that enough times you would have thought I'd get it

As RJ said or the choke (Enrichner) may not be seated all the way

**RJ Gleason** · 12-05-2006, 02:33 AM

I'm thinking that you may have sucked up a chunk of gunk and clogged a jet.

Nason · 12-05-2006, 07:30 PM

I tried it again tonight, but it's still boggin out and dying shortly after starting.

I forgot to mention... When I was putting the carbs back on, i noticed that the pto carb has an open hose fitting on the right side of it, while on the other carb, there is a rubber plug over it. I can't really remember pulling a hose off this, but it seemed strange that one was open while the other was plugged off, so I stuck a peice of hose on it and plugged it. Could this be part of the problem???

Nason · 12-05-2006, 09:45 PM

Anyone?? I'd like to find out more before I pull the carbs again... Thanks for your help.

BC_Dan · 12-06-2006, 02:23 AM

The fitting you plugged should have had a plug on it; that is a good place to put a primer if you ever have one. On my Prowler, there is nothing attached.

The pilot jet circuit controls the fuel from idle to about 1/4 throttle. Like RJ stated, sounds like you may have picked up some crud and sucked it into the jet.

You may also have a problem with the throttle block safety switch, they are known for being as much of a PITA as the ones on the carbs.

I would start with pulling the carbs and looking at the pilots.

Nason · 12-06-2006, 08:48 PM

Well, I pulled the carbs again tonight, and when I dumped the fuel out of them, I noticed it was coming out of one of the journals on the carb(see pic). It seems as though this should be plugged off, as all other similiar openings are. Both carbs are the same way. Should this be plugged?? I'm wondering if I popped the plugs out by accident while blowing the carbs out with compressed air. I would think it would be sucking air through these holes as they are.

Thanks again for all your help and ideas...

I gotta get this pos up and running, cause we've had snow for a couple of days now and I don't know if it's gonna last...

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**RJ Gleason** · 12-07-2006, 01:21 AM

With out and arrow to point to where you mean, it's hard to answer that question.

kccats · 12-07-2006, 09:36 AM

Most likely those are bowel vents, and if you have capped off some of them you could lean out an engine. There should be a small hose coming off a nipple and bent down below the bottom of the bowel.

Nason · 12-07-2006, 06:48 PM

Quote:

Originally Posted by RJ Gleason

With out and arrow to point to where you mean, it's hard to answer that question.

Sorry, I thought it would be more obvious... Here ya go... I didn't cap any off yet, just the one mentioned in a previous post, where the same fitting on the other carb was plugged off.

There wasn't any hose nipples or hoses on these ones

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**RJ Gleason** · 12-08-2006, 04:43 AM

That's just an overflow outlet from the bowl.