PMB ZENOAH INSTRUCTIONS
PMB Model Boats
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| General notes for all
Zenoah engines. When starting the engine, pull the cord gently until the starter dog engages and then pull firmly and quickly to start the engine. (this is very important for the life of the starter mechanism. For longest life and best power output use a fuel mix of 16:1. That is 60ml of oil to 1 litre of petrol. On a standard motor use standard petrol 95 to 97 octane ( Europe). For modified engines use BP Ultimate or Shell VP. Do not use Avgas or high octane racing petrol. Never run the engine too lean, running on the rich side will always give more overall power and a long life engine. If the motor is ever filled with water, take out the sparkplug, turn the motor upside down and pull the engine over several times to get rid of the water. After that, start the motor normally. It is very important to start and run the motor after it has been soaked to remove residual moisture which will corrode the bearings very quickly. Do not use a gasket between exhaust manifold and engine. Carb settings. Standard 644 carb. H 1 1/8, L 1 3/4. When the engine is new its best to richen the H needle by 1/8 to 1 1/4. Run the engine on the water at half throttle for ten minutes and after that full throttle. After more running try screwing in the H needle (leaning the high speed setting) by very small amounts (1/16 of an at a time) to get best top speed.. ZEN7 and ZEN7S. Always use a separate water pickup for the engine. The other pickup should be used for manifold and exhaust. Pipe length should be 330mm to 345 mm from exhaust flange on the engine to widest part of the front cone on the tuned pipe. This measurement is taken along the centreline of the exhaust system. Shorter lengths can be used for higher rpm and smaller props.
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Copyright Dave Marles