Beta Marine Beta 50 Operator's Maintenance Manual page 41

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Problem: Low power output
Possible Cause
Propeller is too big:
Check gearbox reduction ratio relative to propeller size:
Blocked fuel filter:
Blocked air filter:
Air in fuel system:
Governor spring incorrectly mounted:
Single lever control not operating correctly:
The electrical load is too large on start up:
Problem: Erratic running/hunting
Possible Cause
Air in fuel supply:
Fuel lift pump faulty:
Clogged fuel filter:
Fuel return not fed back to the fuel tank, or blocked pipe:
Air filter blocked:
Worn or blocked injector:
Engine rpm in gear is too low, this must be 850 min:
Faulty stop solenoid:
Broken fuel injection pump spring:
Fuel suction head is too great:
Fuse.
NB: For convenience, some engines are supplied with a
spare fuse and holder attached to the main engine fuse
holder.
Solution
Change or depitch.
Change the most appropriate item.
Replace.
Replace.
Check system and bleed
Dealer to adjust.
Disconnect speed control cable and move the lever
by hand. Adjust cable.
Disconnect or reduce the load.
Solution
Check supply system for leaks and fix.
Replace.
Replace.
Re-route pipe or clean.
Replace.
Service injectors.
Increase engine tick over speed.
Disconnect wiring to solenoid. If running improves
check for a wiring fault.
Replace, this is usually caused by water in the engine
oil/fuel.
Fit electric fuel lift pump.
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