Yamaha 55DEHD - Page 36

SPEC
2-11
6885J11
Item Unit
Model
85AEHD 85AED 85AET
Piston ring
Top ring
Dimension B mm (in) 1.965–1.980 (0.0774–0.0780)
Dimension T mm (in) 3.100–3.300 (0.1220–0.1299)
End gap (reference data) mm (in) 0.40–0.60 (0.0157–0.0236)
Side clearance mm (in) 0.05–0.08 (0.0020–0.0032)
Oversize outside diameter
1st mm (in) 82.25 (3.24)
2nd mm (in) 82.50 (3.25)
2nd piston ring
Dimension B mm (in) 1.965–1.980 (0.0774–0.0780)
Dimension T mm (in) 3.100–3.300 (0.1220–0.1299)
End gap (reference data) mm (in) 0.40–0.60 (0.0157–0.0236)
Side clearance mm (in) 0.03–0.06 (0.0012–0.0024)
Oversize outside diameter
1st mm (in) 82.25 (3.24)
2nd mm (in) 82.50 (3.25)
Connecting rod
Small-end inside diameter mm (in) 24.900–24.912 (0.9803–0.9808)
Big-end inside diameter mm (in) 39.010–39.025 (1.5358–1.5364)
Connecting rod big-end mm (in) 0.120–0.260 (0.0047–0.0102)
side clearance
Small-end axial play limit mm (in) 2.0 (0.08)
Crankshaft
Crankshaft journal diameter mm (in) 34.968–34.984 (1.3767–1.3773)
Crankpin diameter mm (in) 29.985–30.000 (1.1805–1.1811)
Runout limit mm (in) 0.02 (0.0008)
Thermostat
Opening temperature °C (°F) 48–52 (118.4–125.6)
Fully open temperature °C (°F) 60 (140)
Valve open lower limit mm (in) 3.0 (0.12)
Reed valve
Valve stopper height mm (in) 9.7–10.1
(0.38–0.40)
Valve bend limit mm (in) 0.2 (0.0079)
Carburetor
ID mark 68808
Main jet (M.J.) # 165
Main nozzle (M.N.) mm (in) 3.4 (0.13)
Main air jet # 180
Pilot jet (P.J.) # 78
Pilot air jet (P.A.J.) # 100
Pilot screw (P.S.) turns out 7/8–1 3/8
Valve seat size ø 1.6
Float height mm (in) 16.5-22.5 (0.65–0.89)
Specification
T
B
T
B
6885J11_02_1 04.1.1 0:43 Page 12