2006 Polaris 120 Owners Manual - Page 62

Maintenance Carburetor ADULT SECTION Proper carburetor adjustment is critical, since a mixture too lean (too much air, too little fuel) will result in overheating of the combustion chamber causing pre-ignition of the fuel. This results in piston burning, bearing failure, or complete engine failure. A lean mixture can be the result of fuel line restrictions, foreign matter in the carburetor, etc. A mixture too rich (too much fuel, too little air) is also unfavorable because it can foul plugs and cause generally poor engine performance. All carburetors have been pre-set at the factory for adequate fuel supply. Higher altitude operation may require different adjustment and settings. The number stamped in the end of the main jet indicates the jet size that was installed at the time of manufacture. For questions about optional jetting for conditions in your area, see your Polaris dealer. 1 1. Engine 2 2. Carburetor Correct setup provides engine RPM within its given power band at full throttle settings and also provides maximum efficiency and operation at all other throttle openings. See your dealer for carburetor adjustments, which may include the following: S Carburetor component changes for specific altitude and ambient temperatures; S Choke adjustment; S Air screw settings, if applicable; S Idle RPM adjustments; S Throttle safety switch checks and servicing; S Throttle block to throttle flipper clearance adjustment CAUTION Improper carburetor adjustments can result in safety hazards as well as serious engine damage. We recommend that all carburetor adjustments be performed by your Polaris dealer. 59