Troubleshooting Guide

20
Pressure test
Connect the pressure gauge (956.004.000) to
the carburetor fuel connection 1.
Set up a pressure of max. 0.5 bar.
If the pressure drops off, check the inlet
needle 2 for damage or foreign objects. If
necessary, replace control parts.
If the inlet needle is OK, replace the gasket 3
and diaphragm 4.
If the pump diaphragm 5 is obviously dented,
it needs to be replaced along with the gasket
6.
Check:
• Screen 7 for contamination
• Pulse hole for contamination
• Foam sealing ring 8 for correct positioning.
The seal ring must be centred on the cover
of the control side, and glued on the whole
surface.
Check control parts
(control lever/inlet needle):
Check the tip of the inlet needle for wear.
Check control lever for correct installation, see
illustration to the right.
If the control lever is too low:
• Insufficient fuel
• Poor acceleration
• No max. speed
If the control lever is too high:
• Carburetor flooding
• Starting problems
• Poor idling
• Poor transition
L
H
SU
UE
L
H
1
6
5
7
4
8
3
2
08
CARBURETOR
Control lever
Control lever
Correctly installed
Control lever
Too high
Control lever
Too low
Base
Setting
(without Limiter Caps)
L= 1 1/2
H= 1 1/2
NOTE: Adjust the carburetor only
using a tachometer.