How To - Adjust That Carburetor

Topic:                           Carburetor Low Speed adjustment

Low Speed Range          600-650 rpm
Pilot Air Screw               1-3/4 turns out 

Expertise Required:      Minimal

Estimated Time:            1 Hour

Parts Neeed:                 None 

Tools Needed:               You will need the following tools:

        • Large/Short Flat Blade Screwdriver
        • Rope or strap to hold bike to pier (500lb strength minimum)

Step-By-Step:               Here's how to get it done

WARNING - DO NOT stand in front of or to the rear of the Wetbike during this procedure. Keep hands, feet and clothing clear of water intake and water outlet area to prevent contact with the moving parts of the Wetbike or contact from objects ejected from the pump.

CAUTION - Low speed adjustment must be made with an adequately warmed-up engine.

1. Anchor the Wetbike to a strong pier or piling. Use a 500 pound minimum rating rope or cable. Use the tow rope hook on the rear of the Wetbike. Make sure Wetbike is in at least 3 feet of water (Not Pictured.)

2. Rotate the pilot air screws clockwise until lightly seated; then back screws out 1-3/4 turns for initial setting. (Not pictured) CAUTION - DO NOT overtighten pilot air screw. Damage to the screw or carburetor body may result.

3. Start the engine. Hold throttle open slightly as engine is supposed to stop when throttle is released. (Not pictured.)

NOTE: Engine must be warmed-up. Timing must be correct.

4. Rotate the air screw until engine runs smoothly and has clean throttle response. (Not pictured.)

5. Synchronize the two carburetors using a commercial digital, dial or stick-type carburetor balancer (Not pictured.)

CAUTION - Carburetor balancing is mandatory after the engine carburetors have been disassembled or removed.

6. Disconnect balance tube from upper carburetor; then connect the balancer to the engine fittings (Not pictured.)

7. Start engine and set air screw for 1000 rpm. Set the balance guage. (Not pictured.)

NOTE: Be sure lower inlet hose is plugged.

8. Disconnect balancer hose from upper cylinder. Connect one of the remaining hoses to the upper cylinder. Zero the balancer. This is done to synchronize balancer. (Not pictured.)

9. Connect one balancer hose to each of the cylinders. (Not pictured.)

10. With the engine running, note the positions or settings of the balancer. Both cylinders must be adjusted equally. (Not pictured.)

11. If the readings are different, rotate the throttle rod adjuster until readings are identical. Lock throttle rod by tightening jam nut. (Not pictured.)

12. Set throttle for proper operation by rotating air speed screw counterclockwise until engine stops. This setting will let the engine stop, should a spill occur. When restarting Wetbike, it will be necessary to rotate throttle slightly to the slow speed range. (Not pictured.)

13. Start engine. Quickly release throttle. Engine must stop! (Not pictured.)

WARNING - Throttle adjustment must be made so engine stops when throttle grip is released. This will allow Wetbike to stop and remain upright if a spill occurs. The operator can then mount Wetbike safely without worry of any rotating components. Failure to correctly adjust Wetbike throttle control may result in personal injury.

14. Remove the balancer hoses from the balance tube fittings. Install the engine balance hose. Secure with hose clamps. (Not pictured.)


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