Fuel System; Carburetor Synchronization; 1) Checking The Synchronization At Idle Speed; 2) Mechanical Synchronization - Rotax 914 Series Maintenance Manual

4) Fuel system

4.1)

Carburetor synchronization

4.1.1)
4.1.2)
Effectivity 914 Series
Edition 1 / Rev. 1
MAINTENANCE MANUAL
Checking the synchronization at idle speed
See Fig. 26 and 27.
For smooth idling, synchronization of the throttle valves is necessary.
When synchronizing, slacken both bowden cables.
Detach the resonator hose (3) of the compensating tube (2) to separate
the two air intake systems. In this condition, no significant difference in
the engine running should be noticeable.
Mechanical synchronization
See Fig. 24 and 25.
For synchronous basic throttle adjustment (mechanical synchroniza-
tion) proceed as follows.
Adjust the two bowden cables for simultaneous opening of the
throttle valves.
Remove cable fixation (4) on throttle lever (1).
Release return spring (5) from its attachment on the throttle lever (1).
Return the throttle lever (1) to its idle stop position (3) by hand. There
should be no resistance during this procedure.
Unscrew idle speed adjustment screw (2) until it is free of the stop.
Insert a 0.1 mm (0.004 in) feeler gauge (gap X) between the idle speed
adjustment screw (2) and the carburetor idle stop (3), then gently turn
the idle screw clockwise until contact is made with the 0.1 mm (0.004
in) feeler gauge. Pull out the feeler gauge and then turn each idle speed
adjustment screw (2) 1.5 turns in clockwise direction.
Gently turn each idle mixture screw (6) (clockwise) until it is fully
inserted and then reopen by 1.5 turns counter clockwise.
Hook the return spring (5) back up to the throttle lever (1) in its original
position. Check that the throttle valve opens fully automatically.
BRP-Rotax
12-00-00
page 25
Sept. 01/07