2002 sportsman 700 just started bogging down as you accelerate. I checked fuel filter and tank vent and are fine. have had issues in past with plug wires coming off plug but they are secure. Always garage kept and fresh gas. Have not pulled plugs yet. any ideas as to what problem could be? Checked air filter and is fine. Tried pulling choke when it starts to bog and it does not help. Idles fine. Seems to backfire when it bogs. Ran fine yesterday, today it bogs down.

 

Check the carb boot for cracks.

 

It has a new carb boot on it

 

fix?