3W 157xi B2 / TS / CS Engine Manual
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at any time. It should sound like it is making quick steady power; without any hesitation.
6. An optimally tuned engine will feel a bit rich after a cold start. It will start to run right after
it has warmed up for approximately one minute.
Trouble Shooting
Problem
The engine is flooded (the crankshaft housing is filled with fuel).
Solution
Remove the spark plug; turn the engine to a position where the fuel runs out.
The engine starts after being choked but then stops soon after.
The low needle on the carburetor is probably too lean. Go back to the recommended settings
and adjust your carburetor from there. This problem may also indicate a dirty carburetor or
faulty ignition.
The engine runs rough and is vibrating strongly.
Balance the propeller. Check the ignition timing. Check your plumbing for air/fuel leaks.
Check your spark plug for carbon and check the spark plug gap. Check the motor mount to
be sure it is rigid. Check to make sure the engine is mounted on a level surface so that the
crankcase is free of tension. Check the engine and propeller bolts.
The engine doesn't reach a normal RPM at full throttle.
Check the carburetor settings. Check to see if the propeller is too large. Verify that you have
the correct muffler system. Check to see if the engine is overheating. Check the ignition
timing. Check the spark plug for defect. Verify you have the correct gasoline, oil, and have
mixed them with the correct ratio.
