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Users Manual
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The ignition system
The Raket 85 is equipped with a transistor ignition system, which
is specially made for Raket kart engines. It is very reliable. Nor-
mally it does not give any problems.
Adjustment of the Raket 85 ignition system starts by adjusting the
distance between the flywheel and ignition unit. This is done with
a non magnetic thickness gauge of 0.35 mm. It is important that
you make the measurement when the poles of the flywheel are
right opposite to the poles of the ignition unit. Then put the 0.35
mm gauge between the poles and tighten the screws that hold the
ignition unit.
Now check the ignition timing. Put a dial gauge clock into the
sparkplug hole. Turn the flywheel until the piston is in the top posi-
tion, (top dead centre) and note the value. Then turn the flywheel
backwards and observe the dial. Stop when the dial shows 2.5-2.7
mm before top dead centre. At this point the ignition system shall
generate a spark. Look at picture to see the correct position of the
flywheel in relation to the ignition unit.
Between 2.5-2.7 mm before t.d.c. The engine gives its best per-
formance. But if the ignition points isn’t correct, what to do? You
have to dismount the flywheel and adjust the flywheel key. You
machine the key so you can move the position of the flywheel to
get the correct ignition point. You probably have to try many times
to get it right. Note that the key is not necessary for keeping the
flywheel on the crankshaft, it just makes it easier to find the cor-
rect position for the flywheel. This is all you can do to adjust the
ignition system.
Maintenance of the ignition system
Very few things can happen to the ignition system. But, regularly
check the sparkplug cable at both ends, the vibrations can break
the cable. Change sparkplug frequently, and put some grease on
the connection to the coil.
GOOD LUCK WITH YOUR RAKET 85 KART ENGINE!
