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Old 01-22-2012, 01:20 PM   #1
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Help 96 panther 440 motor

Hellp every1. Im having a prob. with the wifes sled.Its a 96 panther 2up with the fan cooled 440 dual carb motor. The prob is that it seems to foul out the clutch side plug and starts miss fireing.It doesnt start this untill after a few miles. I have cleaned and got new jets for the carbs. also got new carb to air box boots.I set the carbs air screw to 2 1/2 turns. Changed the cdi box and coil. I have even tried a better injection oil.. Now is this tellin me that the clutch side crank seal is bad ??? Or do i have the carbs not set right? What kind of compression am I suppose to have.Last year the compression was close to each other I havent checked it this year. Plus it seems not to get over 45 mph. Thanks in adavance Joe
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Old 01-22-2012, 09:48 PM   #2
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As for speed, it is a big sled with a 440 fan. About 60 is the best you could ever hope for. Check the clutches for wear and check belt deflection. Makes a big difference.

If the crank seal was bad that side cylinder would run lean, not foul plugs.

If one choke is hanging open it will foul that plug pretty fast.

The base setting for the pilot air screws should be 1 turn out.

Is the plug oil or gas fouled?
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Old 01-22-2012, 10:59 PM   #3
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The white resistor part it black non wet lookin. the recoil side plug the resistor part is still white... Thanks for the heads up on the air screw Ill set that back tomarrow and swap plugs out and give that try.
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Old 01-26-2012, 05:26 PM   #4
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Swap the plug wires (they fire at the same time). If the problem doesn't move, swap the carbs. This should help you isolate it before you start replacing lots of parts.
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Old 01-28-2012, 11:44 AM   #5
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 Quote: Originally Posted by fastdave View Post
Swap the plug wires (they fire at the same time). If the problem doesn't move, swap the carbs. This should help you isolate it before you start replacing lots of parts.
I see what your getting at see if the prob moves to the other side then if it does then the carb has a prob. so should i adjust my air screws b4 i flip flop the carbs?
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Old 02-05-2012, 11:58 AM   #6
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It sounds like one side is running rich. It might be worth checking the diaphragm in the fuel pump. IF there is a small crack/hole, gas will bleed back into crankcase via the vacuum line. This will make at least one side run rich.

When your problem is resolved, I for one would be interested in the resolution, if nothing other than to learn what problems are fixed and how. Thank you
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