URAL Motorcycles 2000 -10 series, Repair Manual, Page: 93 / 193

3. Turn the lever round the stud and remove the valve keys from the other valve.
4. Remove the top valve spring retainers, the springs and the valve spring seats.
5. Free the cylinder head from the tool and remove the valves.
6. Clean the removed parts of carbon, tar, etc., wash them and inspect.
NOTE: A "C-type" valve spring compressor may be used as an alternative to the URAL

tool.
While inspecting the valves, check:
•
Clearance between the valve stem and the guide
•
Wear of the valve stem
•
Condition of the valve head seating chamfer
While inspecting the cylinder head, check:
•
Wear of the valve guide
•
Wear of the valve seat
•
Check wear at two locations: Direction of valve pressure (rocker arm movement) fore
and aft and 90
°
opposite.
Table 4.3-1. Resilience of the Valve Springs and Free Height
Part No. Part Name Diameter of wire
(mm)
Length of spring in free
state, (mm)
6201419-01 outer valve spring 4 43
Resilience of spring:
When compressed to 34 mm, P=145..168 N (14.8...17.2 kgf);
When compressed to 35.75 mm, P=296...343 N (12.15...25.85 kgf)
6201420-01 valve spring,
inner
3 39
Resilience of spring:
When compressed to 30.5 mm, P=96.5..111 N (14.8...17.2 kgf);
When compressed to 35.75 mm, P=296...343 N (12.15...25.85 kgf)
Remember that the compression, power, and fuel consumption of the engine depends to
a great extent on the condition and correct machining of the valves, guides, and seats.
If the seats and heads of the valves are fouled with carbon but their wear is insignificant,
while valve contact area is concentric and within 1.5 to 1.8 mm, proceed only with
cleaning the valve and touching up the seat chamfer.
In case of considerable deformation, burn spots or cracks on valve head, replace the
valve. If the valve has only minor defects such as pits or burn spots on the seating area,
the valve can be ground, providing there is sufficient metal left. Use a valve refacing