Zenoah GZ3500T, Workshop Manual

Page: 43 / 56

English –
43
Repair instructions
Adjusting the carburettor
Conditions during adjustment
• Before any adjustments are made the air filter
should be clean and the air filter cover fitted.
Note! Adjusting the carburettor with a dirty air
filter will give a too lean fuel mixture the next
time the air filter is cleaned. This can give rise
to serious engine damage.
• Fit a combination of chain and bar approved for
this model (see technical data in the operator’s
manual).
T435 12”-14”
• The chain must not be tightened more than that
about 0.5 cm remain to the bar.
See figure 54.
Replacing the H-needle or entire carburettor
1. Screw the new H-needle to the bottom and
turn it “A” revolutions anticlockwise.
T435 A = 2
2. Start the engine. If necessary, adjust the idle
speed with the T-screw until the chain stops.
3. Adjust the H-needle so that a top speed of “B” rpm
is attained. Use a revolution counter.
T435 B = 12,500 -13,000, speed limitation
Use screwdriver 531 00 48-63.
4. Let the engine run at “B” rpm for about 1 minute
until it is warm.
Replacing the L-needle
1. Screw the new L-needle clockwise to the
closed position and then turn it ”D” revolutions
anticlockwise.
T435 D = 2.5
See figure 54.
Fig 54