PMB RACING ZEN8/ZEN9 SETTINGS
With the Walbro 1048 carb start at 1 1/8 H 1 3/4L
With the Mod 257 carb start at 1 1/8 H and 2 L.
Use good quality oil and mix at approximately 13:1 which will be
300ml of oil to 4 litres of petrol. We recommend in UK to use
Shell Advance Racing M oil which is a castor/synthetic oil and
will give good engine performance, corrosion resistance and good engine
life.
Set the tuned pipe at NO LESS than 350mm from exhaust flange to widest
part of cone at first and gradually shorten the length to get best
performance after 30 minutes of running the engine. Run the motor on the
lake using short bursts of full throttle for one or 2 tanks of fuel.
You can then run the motor flat out for a few minutes and then bring it
in to the shore at full speed, chopping the throttle at the last
minute. Remove the spark plug and check the colour of the plug
parts inside the combustion chamber, they should be medium brown.
If they are black then the H setting is too much. If they
are very light brown to grey then immediately make the H more open.
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