Carburetor Adjustment - URAL Motorcycles L4 SERIES Owner's Manual

The engines uses two L 22 AA Keihin carburetors (Fig. 9),
To adjust L 22 AA Keihin carburetors, proceed as follows:
1. Using cable adjustment screw, provide free travel of 2...3 mm between cable sheath and throttle
cable adjustment screw(Fig 9a).
2. Start and warm up the engine at idling.
3. Screw in the mixture screw (8) until it stops and provide minimum steady speed of the engine using
screw (7)
4. Undo screw (8) to have as high engine speed as possible with screw (7) at the same position.
5. Using screw (7), provide possibly minimum steady engine speed.
6. Repeat steps 3...5 for the second carburetor.
7. Using screws (7), adjust steady operation of both cylinders at idling by alternatively shutting down
cylinders (HV wires must be grounded during these operations) thus providing steady operation at engine
speed as low as possible.
8. Measure CO in exhaust gases the content of which must not exceed 4,5% (ECE Regulation 40). The
sampler of gas analyzer should be put into the silencer for not less than 60 mm deep. Measure exhaust in both
silencers
- Screw in screws (8) on both carburetors to ¼ of the turn.
- Adjust carburetors again as described in Point 7
- Measure noxious gases again for each silencer.
-Repeat procedure, Point 9, whenever necessary.
The carburetor fails to adjust and conform to requirement stated above should be replaced.
Carburetors
Fig. 9. General view of carburetor

Carburetor adjustment