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Problem: Carburetor Too Lean (0-1/4 Opening)
Condition
Remedy
1.
Choke plunger
remains seated
2.
Pilot air screw
too far out — damaged
3.
Piston valve
sticks open — damaged — worn
4.
Pilot jet — outlet
obstructed
5.
Float/inlet needle
obstructed — damaged — adjusted
incorrectly
1. Adjust — service choke cable — plunger assembly
2. Adjust — replace pilot air screw
3. Service — replace piston valve — throttle cable — spring
4. Remove obstruction
5. Remove obstruction — replace inlet needle — float —
adjust float tab
Problem: Carburetor Too Lean (1/4-3/4 Opening)
Condition
Remedy
1.
Pilot air screw
too far out — damaged
2.
Needle jet
obstructed
3.
Pilot jet — outlet — main jet
obstructed
4.
Float/inlet needle
obstructed — damaged — adjusted
incorrectly
5.
Jet needle E-clip
position
incorrect
1. Adjust — replace pilot air screw
2. Remove obstruction
3. Remove obstruction
4. Remove obstruction — replace inlet needle — float —
adjust float tab
5. Adjust E-clip
Problem: Carburetor Too Lean (3/4-WOT Opening)
Condition
Remedy
1.
Main jet
obstructed — too small
2.
Float/inlet needle
obstructed — damaged — adjusted
incorrectly
3.
Needle jet — jet needle
obstructed
1. Remove obstruction — replace with larger main jet
2. Remove obstruction — replace inlet needle — float —
adjust float tab
3. Remove obstruction
Problem: General Fuel System (Engine Cuts Out at High RPM)
Condition
Remedy
1.
Fuel delivery
inadequate
2.
In-line fuel filter
obstructed — damaged
3.
Gasoline
contaminated
4.
Gas-tank vent — hose
obstructed
1. Repair — replace fuel pump — impulse hose
2. Remove obstruction — replace in-line fuel filter
3. Replace gasoline — de-ice — clean carburetors
4. Remove obstruction — replace vent — hose
Problem: General Fuel System (One Cylinder Runs Lean)
Condition
Remedy
1.
Carburetor-to-cylinder
air leak
2.
Carburetors
not aligned vertically
3.
Primary compression (crankcase)
low
4.
Carburetors
not synchronized
1. Repair — replace gaskets — flanges — service intake
ports — tighten clamps
2. Align carburetors vertically
3. Troubleshoot engine
4. Synchronize carburetors
Manual
Table of Contents
Summary of Contents for Sno Pro 120 2011
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