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1989 Polaris Big Boss will idle but no throttle response.

Mikey124

By Mikey124
in Polaris ATV Forum

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Mikey124

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I have a 89 Big Boss 250 I can get it to idle very slowly with no throttle response.  I did get it to run normally a couple times only after working the throttle every so slowly to get the RPM's up enough so that it would move.  Even when i did get it to run normally it bogged back down for a brief moment then came to normal.  Not sure if it's a fuel problem or if I should be looking into the ignition system for possible low voltage issue.

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Mech Mentor

Mech

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It it's a carby model then the first thing I'd do would be use the drain screw on the bottom of the carb and catch what comes out looking for water, then I'd turn the tap on and make sure plenty of fuel was getting right through the tap and filters and into the carby at a good rate.

If you have a timing light you could connect it to the bike and watch it when the bike falters looking to see the spark wasn't dying out. If you don't have one then...

If draining the fuel and checking the flow didn't change things then I'd take the carby off and strip it right down, entirely, and clean every jet and passageway, and then check the seals where it fits onto the engine as I was putting it back together.  It will probably be right after that.

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