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post #1 of 7 (permalink) Old 12-13-2008, 08:29 AM Thread Starter
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1992 Arctic Cat Jag 440 FC

Hello Crew,
So recently I got the sled from my fathers and brought it home. it had been sitting for 2 years. Prior to sitting it ran like a total champ absolutely no problem. When I get it it barely starts. I drained the fulel lines/tank. I also took the carb off and cleaned everything throughly. From there I put it back in with 93 Octane gas. I pulled her 5 times and she started up and stayed running.

She idles fine. Has horrible take off power... It'll just bog and won't go up hills. after moving 5 miles an hour the power increases greatly for 30% of throttle then it plateaus off.

When idling she is smoking pretty bad and you can smell richness of gas.

The carb on this has 2 screws located on the pullstart side. A big screw with an external spring/screw. I believe thats for the idler. Then to the left of that or closer to steering wheel there is a smaller screw with an internal spring. I have no idea what that controls.

My question is this. I havren't replaced the plugs but I can that I am getting spark.

My suggestions that could be it are vaccum leak (is this possible?) My idler screw is not adjust right or the other "unknown" jet is not adjusted right. I lso think it could be the choke cable going to Carb. This does not have butterfly's.


So can someone give me some hints or tips to tackle. After work today I am getting spark plugs and will try that and limit that its not the plugs. From there I am going to pay ith the jets.

Any suggestions?
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post #2 of 7 (permalink) Old 12-13-2008, 09:17 AM
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try new plugs first, the small screw is the pilot that will ajust you bottem end


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post #3 of 7 (permalink) Old 12-13-2008, 09:21 AM Thread Starter
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Quote:
Originally Posted by Spun222400 View Post
try new plugs first, the small screw is the pilot that will ajust you bottem end
By bottom end you mean idle to acceleration????? This lower pilot has not been adjusted since I started cleaning the carb.
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post #4 of 7 (permalink) Old 12-13-2008, 02:40 PM
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It's the air mixture screw that controls the fuel/air ratio from idle to about 1/4 throttle.
This should be set from between 1 to 1.5 turns out from gently bottomed.
Start at 1 out and then adjust in 1/8th increments. You will find a "sweet spot" in it and then set the idle at about 1500 to 1800rpm.

A vacuum leak would make it start hard and one cylinder would be running lean as indicated by gray or white tips on the plugs.

Make sure that the enricher (choke) is returning to the bottom of its slide and sealing as a sticking one will make the engine run rich all the time.

Most likely it is a sticking choke that is causing your problem, best bet is to thoroughly clean the carbs.

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post #5 of 7 (permalink) Old 12-14-2008, 02:12 AM Thread Starter
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Wow thanks for the details. You helped me out alot. I did all that you said and it was a combo from the choke sticking and the new plugs I put in it. I bought BR8 plugs instead of BR9 because thats all they had. They don't stick so far into the cylinder because BR8 are shorter. I've noticed a huge difference right from the get go... my question is should i put the BR9 back in or should I stay with the short BR8'S ?

Thanks for all the help
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post #6 of 7 (permalink) Old 12-14-2008, 09:42 AM
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BR9ES is the recommended plug for most engines.
Also, that engine is designed to run on 87 octane, spending the extra for 92 is a waste of money as you are not getting any gains from running it.

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post #7 of 7 (permalink) Old 12-14-2008, 11:28 AM
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If you didn't take the mixture screw out then you didn't clean the carb completely! Take it back apart and remove the main and pilot jet and clean them too! Dont forget to clean the choke passages too!
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