1994 300 running issues (backfires)
#1
1994 300 running issues (backfires)
I will start by saying this machine came to me not running. It had been overheated and the piston was scored. Disassembled, replaced piston and repaired cylinder. Overhauled the carb with all new parts. Went to start and machine would not run unless the choke was used. Went thru carb again. Replaced both pto and mag side crankcase seals. Machine will now run pretty good. The problem I have is when letting off the throttle there is a tremendous backfire. I have checked and double checked for air intake leaks (lean condition). When the flywheel and stator where removed everything was put back into the original position. How do I check timing? Would this cause my problem? Do not know where to go from here. Any help or ideas would be appriciated.
#2
#3
I believe the cause of the melt down was the mag side seal. When I replaced the seal it came out with the lip of the seal torn loose. The machine would not hardly run and then would not run after the rebuild. Replaced the seals and the machine runs good with the exception of the backfire.
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Hankey Pankey
Polaris Ask an Expert! In fond memory of Old Polaris Tech.
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10-18-2020 03:50 PM
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