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Old 11-19-2009, 07:54 PM   #1 (permalink)
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Angry 1996 Cougar 550

My cougar is not doing to good. I did a jug swap last year, Because it had scratches and the compression was low (65Psi). I replaced the Jug and it went up to 119. It ran great all winter until the last ride of the year. It would be great at start up. 2-3 pulls and it would fire up. The last day it was really diffucult. Ether was needed. When it started and warmed up was ready to go it would bog and backfire a little then it would die.. Only when i'm on the throttle and moving. NOT at a high idle sitting still. It would start up in 2-3 pulls but I needed to choke it to keep it going. Any Ideas, Anybody. Snow is almost here and I want to be ready. Any help would be great. By the way, I always cleaned the carbs and it has fresh plugs. Only Arctic Cat oil, and prem gas is used in all of my machines.
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Old 11-19-2009, 10:28 PM   #2 (permalink)
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Recheck your compression.
Having to keep the choke on means the engine isn't getting enough fuel. If the carbs are still clean you may have contaminated fuel. Drain the carbs into a clean container, water will settle in the bottom as bubbles.
Does it continually run poor at a cirtain throttle position or is it more random?
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Old 11-20-2009, 10:42 AM   #3 (permalink)
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1st of all never use starting fluid on a sled.

2nd did you clean the pilot air jet? If not, use copper wire and carb cleaner, make sure it's thoroughly cleaned. If so, make sure you put the screw back in with exactly the same amount of turns.



I'm guessing your carbs are out of sync.
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Old 11-22-2009, 12:40 PM   #4 (permalink)
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Recheck your compression.
Having to keep the choke on means the engine isn't getting enough fuel. If the carbs are still clean you may have contaminated fuel. Drain the carbs into a clean container, water will settle in the bottom as bubbles.
Does it continually run poor at a cirtain throttle position or is it more random?
When I pick them up I can tell you. I stil have them in storage. When it was running last season, didn't really matter. Sometimes getting it to idle was a bear, and sometimes it wasn't until I got her up in the power band. Say......... around 3500 Rpm. I'm lost on what to do. Short of me bringing it in and getting raped on repair charges!!!!
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Old 11-22-2009, 12:44 PM   #5 (permalink)
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As Twins said, a good soaking carb cleaning is in order. Pay particular attention to the pilot jets. They are very small and clog easily. Run a fine wire through there to ensure that they are clear.
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Old 11-22-2009, 12:47 PM   #6 (permalink)
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As Twins said, a good soaking carb cleaning is in order. Pay particular attention to the pilot jets. They are very small and clog easily. Run a fine wire through there to ensure that they are clear.
Hey thanks a lot guys. I really apreciate it. Good to know that people have a place to go to ask questions. Safe ride
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Old 11-22-2009, 07:46 PM   #7 (permalink)
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119 is still too low! Is that @WOT? You will likely be even lower now! Why would you put a used cyl on? It will likely do the same as your old one! Have your jugs replated, new pistons and have the skirts coated!
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Old 11-23-2009, 07:45 PM   #8 (permalink)
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119 is still too low! Is that @WOT? You will likely be even lower now! Why would you put a used cyl on? It will likely do the same as your old one! Have your jugs replated, new pistons and have the skirts coated!
What is @WOT? At the time I couldn't afford to replate, and to get my machine back on the trail this is what I had to do. I got them out of storage and took the carbs off. $hit man!!!!!! It looked like the jello factory went off in there. Good thing I bought a new tank!! I guess now I'll replace the lines, filter, and give the carbs a good soaking and cleaning. As far as the Air jets go, is there a parts manual that I could use as a reference? I suck at carbs ( no pun intended). I also retested the compression and one Cyl is at 121, and the other is at 120. What is the norm for pressure. I only ask because the book I have on this sled says that anywhere between 115 and 130 is good. Depending on the mileage of the pistons gaskets etc.... By the way, I'm from Northern IL as well. Any more east I'm in the lake, and anymore North I'm in cheese land.

Last edited by Lakelandracer; 11-23-2009 at 07:47 PM. Reason: forget to add.
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Old 11-23-2009, 08:29 PM   #9 (permalink)
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It should run fine with around 120.

There are several stickys for help rebuilding the carbs in the engine/driveline section of the forum. Mikuni round slides are very simple, but do varnish up very easilly.

WOT is Wide Open Throttle, when you check compression, it's best to have the throttle wide open to allow the maximum air into the cylinder. Warm engine compression will usually be a bit lower than cold, too.

When you get the carbs clean, a good initial setting on the air screw will be one turn out from lightly seated.
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Old 11-23-2009, 08:35 PM   #10 (permalink)
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Cool. Thank you. I'm smiling my @ss off right now. with this info and the fact that I Can't wait to get that snow!!! There calling for it by Wed, Thur in my area!!! Not a measureable amount, but still its a start right!?!?!?!
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Old 12-19-2009, 10:05 AM   #11 (permalink)
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Finished just to start again

Hey guess what?!?!?!? My sled runs like a raped ape!!!! The carbs were so bad, that it looked like the Jello factory blew up in there!! After I took everything apart and gave her a good soaking it fired up on the third pull. Can't wait to whip my buudy's butt on the trails again!!! He has a 06 F6 sno pro. Amazing that I can not only hang with him, but to pull away and turn with him in the trails is great. Does anybody have any ideas on whi its so hard to start my 96 XCR 600. I cleaned and adjusted the carbs, Still seems to be to diffucult. At least 10 pulls in a warm garage.
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Old 12-19-2009, 10:37 AM   #12 (permalink)
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Try new plugs.
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1996 Arctic cat ZR 580- 6 inch risers, C+A powder skis, 99 ZR's front suspension, freshly rebuilt engine

1992 Ski doo mach 1 617cc (the beast)

Die hard polaris anti-fanatic!

Do the snow dance with me!!! We don't get enough in Vermont!

And God said: "Let there be snow."

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Old 12-20-2009, 09:53 AM   #13 (permalink)
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Already did that. I adjusted the mix ratio and its better. I was getting worried that She would never start in the cold. 4th pull and shes good. It got pretty cold here in Chicago last night, with the wind and what not. Hell even my cougar had to be pulled like 6 times. She usually starts withn 3. I really apreciate the help all. Thank you, and safe ride.
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