BOMBARDIER Johnson 90 Service Manual page 194

POWER UNIT
CYLINDER HEAD ASSEMBLY
VALVE
SPRING
Valve spring free length
Measure valve spring free length.
1. f filst1
Vernier calipers
Valve spring free length:
Standard: IN and EX 42.7 mm (1.68 in)
Service limit: IN and EX 41.0 mm (1.61 in)
lf measurement exceeds service limit, replace valve spring.
Valve spring preload
Measure valve spring preload.
1©.1
Vernier calipers
Valve spring preload:
Standard:
IN and EX 167-193 N (16.7-19.3 kg;
36.8 - 42.5 lb) for 32.6 mm (1.28 in)
Service limit:
IN and EX 151 N (15.1 kg; 33.3 lb) for 32.6 mm
(1.28 in)
lf measurement exceeds service limit, replace valve spring.
Valve spring squareness
Using a square and surface plate, measure each spring for
squareness (clearance between end of valve spring and
square).
1©.1
Vernier calipers
Valve spring squareness:
Service limit: IN and EX 2.0 mm (0.08 in)
lf measurement exceeds service limit, replace valve spring.
7'
6-40