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Louie, Technician
Category: Motorcycle
Satisfied Customers: 11943
Experience:  25+ yrs. experience
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I have a 98 Polaris 500. Runs bad, backfires through the

Customer Question

I have a 98 Polaris 500. Runs bad, backfires through the carb. Oil in the air filter box
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Louie replied 1 year ago.

Hi and welcome to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially, oil (if not excessive) is to be expected as there is a vent tube from the engine internal to the airbox.

For the "...Runs bad, backfires through the carb...", proposed preliminary tries (if have not been done):

  • • ensure battery voltage does not exceed 14.5V even when attempting to rev the engine;
  • • check or better yet, replace the sparkplug;
  • • verify integrity of the sparkplug wire and cap with no arcing;
  • • ensure fuel quality, quantity and delivery.

Please post back results / observations of the above once tried.

Customer: replied 1 year ago.
Coil, wire, and spark plug has been replaced
Expert:  Louie replied 1 year ago.

Appreciate the additional information.

And the voltage check please? ...fuel quality, quantity and delivery?

Customer: replied 1 year ago.
Will check at daylight
Expert:  Louie replied 1 year ago.

Appreciate the post back and would look forward to an update when able.