Carburetor Troubleshooting
Flooding
• floats set too high
• float sticking, misaligned
• float needle seat worn or damaged
• BS34, float needle body o ring defect
• BS38, float needle body washer defect
• float ruptured
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Lean Air/Fuel Mixture
Lean - Idle
• pilot jet too small
• air leak
• pilot air screw not adjusted properly
• slide worn
• cheap pod filter blocking air jet
Lean - Acceleration
• float level too low
• jets clogged
• worn or damaged slide
Lean - Midrange
• air leak
• main or needle jet clogged
Lean - High Speed
• float level too low
• main jet too small
• main jet blocked
Lean - Full Range
• tank cap vent
• filters blocked
• air leaks
• worn slide
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Rich Air/Fuel Mixture
Rich - Idle
• pilot air screw incorrectly adjusted
• pilot jet too large
• dirty pilot circuits
• cheap pod filter blocking air jet
Rich - Midrange
• flooding
• main jet too big
• dirty air filter
Rich - High Speed
• flooding
• main jet too big
• dirty air filter
Rich - Full Range
• flooding
• dirty air filter
"Chirping" Carbs
• inlet manifold cracked, not sealing to carb
• inlet manifold gasket
• vacuum barb bung
• butterfly shaft seals
• diaphragm
• air filter manifold
• air mix screw o-ring