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15. TROUBLESHOOTING
15.1 TROUBLESHOOTING GUIDE – 2-STROKE MOTOR UNIT
Problem
Probable cause
Suggested remedy
1. Engine will not start.
2. Engine will not restart after
refuelling.
3. Engine runs roughly.
4. Heavy blue smoke from
exhaust.
Engine stop switch activated.
Little or no fuel.
Stagnant fuel (fuel has been
stored too long).
Spark plug electrode fouled or
the gap is incorrectly set.
Spark plug H.T. lead not
properly connected.
Choke set incorrectly for the
starting conditions.
Air filter clogged.
Engine flooded with fuel (the
engine has been over primed]
Fuel filter clogged
No fuel in the lines.
Choke set incorrectly.
Service due.
Stagnant fuel (fuel has been
stored too long).
The fuel, oil mix is incorrect.
Slide stop switch back to on
position.
Mix up a fresh batch of 25:1
[fuel with 2-stroke oil] and
refill.
Drain fuel tank. Mix up a fresh
batch of 25:1 [fuel with
2-stroke oil] and refill.
Remove and service/replace
spark plug
Push H.T. lead on firmly and
make sure the engine housing
is not preventing a good
connection.
Move the choke to the other
setting and try again.
Clean/replace air filter.
Remove spark plug and dry the
electrode of fuel. Pull the start
handle 2 or 3 times without the
spark plug fitted. Wait a
moment before refitting the
spark plug and trying again.
Replace fuel filter [in fuel tank].
If the engine was run until
starved of fuel, repriming may
be necessary to purge any air
from the fuel supply line.
Adjust choke.
Clean/replace air filter and
spark plug.
Drain fuel tank. Mix up a fresh
batch of 25:1 [fuel with
2-stroke oil] and refill.
Drain fuel tank. Mix up a fresh
batch of 25:1 [fuel with
2-stroke oil] and refill.
