CHAPTER 3B ENGINE 50cc/80cc ATV SERVICE MANUAL09.0
CHAPTER 3B ENGINE PAGE 3B - 3 -
Specified spark plug: NGK:C7HSA
LD: A7TC
Check spark plug gap:
0.6-0.7mm
Check plug for dirt, carbon build-up, cracking
of insulator.
3.1.4 Valve Adjustment
Always check and adjustment with engine
temperature lower than 35℃(95℉)
Remove cylinder head cover.
Rotate cooling fan to camshaft locate mark
at top dead-center, aligning magneto fly
wheel “T” mark with mark on crankcase.
Valve gap checking and adjustment
Valve gap: IN:0.04-0.06mm
EX: 0.04-0.06mm
To adjust valve gap, loosen jam nut and
rotate adjusting nut.
Valve adjustment wrench
● Be sure to check valve gap again after
locking jam nut.
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