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Matt, Engineer
Category: Motorcycle
Satisfied Customers: 21973
Experience:  Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
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Midrange and high speed misfire changed plug fuel and air

Customer Question

midrange and high speed misfire changed plug fuel and air filter
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: starts exellent fuel consumption seems normal
JA: What is the model/year of your motorcycle?
Customer: 2009 polaris 500 ho wih 1600 miles
JA: Are you fixing your bike yourself? What have you tried so far?
Customer: i have changed the plug fuel and air filter
JA: Anything else you want the mechanic to know before I connect you?
Customer: it seems to work sastisfactory for app 2 to5 minutes
Submitted: 1 month ago.
Category: Motorcycle
Expert:  Matt replied 1 month ago.


I'd suggest to remove the top of the carb and inspect the level of fuel in the float bowl

as it should be about 2/3rds full

if its too full it will flood the carb and stall the engine, if its too low then the engine will be starved of fuel

you can adjust the level by bending the tab on the back of the float where it rests on the needle valve that controls the fuel coming into the carb

If this is OK then I'd next remove the carb entirely and use compressed air or an aerosol of carb cleaner to blast through each of the jets and the air circuit as if they are even slightly blocked it will alter the air / fuel mixture

Expert:  Matt replied 1 month ago.

do you still need help?
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