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post #1 of 11 (permalink) Old 02-08-2012, 12:24 PM Thread Starter
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No spark on one cylinder

I have a 97, 440 bearcat. After a good carb cleaning and some seafoam it was running good and i got to say "I told you so to the wife". Then it started spitting and sputtering a bit. I lifted the hood and pulled a plug wire off and nothing happened. I put the wire back on and pulled the other wire off and the machine died. I put the wire back on and high tailed it home.
From what i have found i should start with cutting off 1/4 inch of the plug wire. What would you recommend if that doesn't fix the problem?

Thanks for your imput.
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post #2 of 11 (permalink) Old 02-08-2012, 01:54 PM
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You haven't proved it's the spark yet. Take the plug out, plug it in the coil, ground it to the motor, and pull it over (best in poorly lit area).

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post #3 of 11 (permalink) Old 02-08-2012, 11:44 PM Thread Starter
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You're right! Hadn't thought of that. That cylinder may not be getting fuel. Could the fuel pump not be pumping to both sides?

thanks
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post #4 of 11 (permalink) Old 02-09-2012, 04:10 AM
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OR one carb might have a bunch of crap in the bowl. All you need to do to test spark is swap plug wires. If the cylinders change, then it's a spark problem. If not, look at the carb.

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post #5 of 11 (permalink) Old 02-09-2012, 06:49 AM
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Always clean the carbs every preseason! And pay special attention to the pilot jet up the tube!

Last edited by kccats; 02-09-2012 at 08:58 PM.
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post #6 of 11 (permalink) Old 02-09-2012, 11:17 AM Thread Starter
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The carbs were cleaned well and a good dose of Sea Foam was dumped in the tank. Rode the sled on a few short hops and replaced some fuel lines. Went on a 40 mile trip and the machine was as good as a 40 mile ride can be on a 97 bearcat can be. Went to go on a short ride with the daughter and the machine started to struggle. Do you think maybe some gunk came lose in the carbs? When I get home I'll swap the plug wires and see whats what.

Thanks
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post #7 of 11 (permalink) Old 02-09-2012, 01:00 PM
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Did you ever drain the old gas and replace it?

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)

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post #8 of 11 (permalink) Old 02-09-2012, 01:39 PM Thread Starter
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I did drain the gas at the beginning of the season.
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post #9 of 11 (permalink) Old 02-09-2012, 08:51 PM
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Let us know how you make out on the plug wire swap.

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post #10 of 11 (permalink) Old 02-09-2012, 08:59 PM
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And a compression test at wide open throtle as well as plug color may tell us something?
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post #11 of 11 (permalink) Old 02-09-2012, 09:58 PM Thread Starter
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I get home friday, so il let you know what i find. Thanks for all your help.
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