SERVICE
4
97-04-10
8. Start the engine. If necessary, adjust the idle speed with the T-screw.
9. Apply full throttle. Use a narrow blade screwdriver, inserted through the hole in the cap
until it reaches the slot in the needle (max. blade width 2 mm, 0.08 inch) to turn the H-
needle counterclockwise until the engine clearly 4-cycles. Turn the H-needle back
clock wise until 4-cycling stops and a top speed of 8400 +- 200 rpm is achieved.
Note that the revolution 8400 +- 200 shall be achieved as close to the 4-cycle limit as
possible.
10. Let the engine run for 2-3 minutes until warm.
11. Check that the top speed is still 8400 +- 200 rpm. Adjust if necessary.
12.Check that the locking cap is still adjusted to its richest setting. (Turned
counterclockwise to stop.)
13.Gently knock the locking cap into position. Use a 5 mm (0.2 inch) mandrel or the
locking pin for the gear, 502 02 61-03.
This is a basic carburettor adjustment. Further fine adjustments, within the limits the
locking cap allows, may be necessary to achieve optimum performance. See the
Operator’s manual.
After replacement of only L-needle
1. Adjust the H-needle to the leanest position. (Turned clockwise to stop.)
2. Take off the locking cap from the L-needle using e.g. a pair of cutting pliers and
unscrew the needle.
3. Screw the new L-needle to the bottom and then turn it counterclockwise 2 turns.
4. Press a new locking cap on the L-needle to the first stop, which means that the cap is
not
fixed to the needle, but can be rotated separately.
5. Adjust the locking cap to the leanest position without turning the needle. (Turned
clockwise to stop.)
6. Start the engine and let it run on idle.
7. Use a narrow blade screwdriver, inserted through the hole in the cap until it reaches the
slot in the needle (max. blade width 2 mm, 0.08 inch) to adjust the L-needle until high-
est possible idle speed is achieved.
English Page 3/5
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