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Reference Information
Service Specifications, 40 – 60 HP
Service Specifications, 40 – 60 HP
Service Specifications
HP 40 40 H.O. 50 60
Engine
Full Throttle Operating Range 5000-6000 RPM 5000-6000 RPM 5500-6000 RPM 5500-6000 RPM
Power
40 HP (29.4 kw) @
5500 RPM
40 HP (29.4 kw) @
5500 RPM
50 HP (36.8 kw) @
5750 RPM
60 HP (44.1 kw)
@ 5750 RPM
Idle RPM in NEUTRAL 750 ± 50 EMM Controlled
Idle RPM in Gear 800 ± 50 EMM Controlled
Weight
(may vary depending on model)
(RL) Models: 232 lbs. (105 kg)
(HL, PL, SL, TL) Models: 240 lbs. (109 kg)
Engine Type In-line, 2 Cylinder, Two-Cycle
Displacement 52.7 cu. in. (864 cc)
Bore 3.601 in (91.47 mm)
Stroke 2.588 in. (65.74 mm)
Standard Bore
3.6005 to 3.6015 in. (91.45 to 91.48 mm)
To bore oversize, add piston oversize dimension to standard bore
Top Crankshaft Journal 2.1870 to 2.1875 in. (55.55 to 55.56 mm)
Center Crankshaft Journal 2.1870 to 2.1875 in. (55.55 to 55.56 mm)
Bottom Crankshaft Journal 1.5747 to 1.5752 in. (40.0 to 40.01 mm)
Rod Crankpin 1.3757 to 1.3762 in. (34.94 to 34.96 mm)
Piston Ring End Gap, Both 0.011 to 0.023 in. (0.28 to 0.58 mm)
Fuel System
Fuel/Oil Control EMM Controlled
Starting Enrichment EMM Controlled
Preferred Fuel Regular unleaded gasoline
Acceptable Fuel
Use unleaded regular gasoline. The use of unleaded gasoline containing alcohol
above the percentage specified by government regulations is not recommended. Do
NOT use Fuel labeled "E85." Use of fuel labeled E15 is prohibited by U.S. EPA Reg-
ulations.
Minimum Octane 87 AKI (R+M)/2 or 90 RON
Additives
2+4
®
Fuel Conditioner, Fuel System Cleaner
Use of other additives may result in engine damage.
Minimum (High) Fuel Pressure 24 to 28 psi (165 to 193 kPa)
Minimum Fuel Lift Pump Pressure 3 psi (21 kPa)
Maximum Fuel Inlet Vacuum 4 in. Hg.
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