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post #1 of (permalink) Old 12-21-2000, 10:11 AM
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81 CITATION

I have an 81 ski doo citation 4500 with a 377cc rotax twin,single carb. My problem is ihave one cylinder which is backfiring threw the carb. I have changed the plug and the external coil this has made no difference. thanks f15

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post #2 of (permalink) Old 12-22-2000, 12:45 AM
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Re: 81 CITATION

first you'll have to take a compression test to see if the cylinders are near equal pressures then we can go from there

post #3 of (permalink) Old 12-22-2000, 10:48 AM
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Re: 81 CITATION

i have done a compression check and have 120psi in each cylinder . the cylinder that is backfiring ,ihave been having problems with the plug fouling out. thanks f15

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post #4 of (permalink) Old 12-23-2000, 08:19 PM
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Re: 81 CITATION

check your porting. had acoil that went bad. i dont think it was that. check the pipe. see it is flowing freely.

post #5 of (permalink) Old 12-24-2000, 01:08 AM
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Re: 81 CITATION

replace the cap resistors on the ends of the spark plug wires they are cheap and they will cause this problem when bad, it will need them anyway.

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