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Yamaha MZ300 Engine
General Technical Data
Yamaha MZ300 Engine Specifications
Engine Model ................ Yamaha MZ300
Engine Type ................ 4-cycle overhead valve 1-cylinder air-cooled small gasoline engine
Number of Cylinders ................ Single
Displacement, cu.in (cc) ................ 18.1 (296)
Cylinder Bore, in (mm) ................ 3.15 (80.0)
Piston Stroke, in (mm) ................ 2.32 (59.0)
Rated Engine Power, hp (kW) ................ 9.5 (7.0)
Rated Engine Speed, rpm ................ 3600
Maximum Torque, Nm (ft-lbs) ................ 20.3 (15.1)
Torque Speed, rpm ................ 2400
Compression Ratio ................ 8.4:1
Cylinder Liner ................ Cast iron
Valve Arrangement ................ OHV
PTO Shaft Rotation ................ Counterclockwise (from PTO shaft side)
Lubrication System ................ Forced splash type
Cooling System ................ Forced air
Air Cleaner Type ................ Semi-dry, dual, or semicyclone
Ignition System ................ TCI (transistor controlled ignition)
Starting System ................ Recoil or electric starter
Fuel System
Fuel System Type ................ Carburetor
Carburetor Type ................ Float
Governor Type ................ Centrifugal, flyweight
Fuel Tank Capacity, qts (L) ................ 5.8 (5.5)
Fuel Type ................ Gasoline (86 or higher)
Fuel Consumption, g/ps-h ................ 220
Dimensions and Weight
Overall Length, in (mm) ................ 14.2 (362)
Overall Width, in (mm) ................ 16.8 (426)
Overall Height, in (mm) ................ 18.3 (464)
Dry Weight, lbs (kg) ................ 57.2 (26.0)
Yamaha MZ300 Maintenance Data
Service Data
Cylinder Bore Inside Diameter (Max), in (mm) ................ 3.1555 (80.150)
Cylinder Head (Max. Out of Flatness), in (mm) ................ 0.003 (0.08)
Intake Valve Clearance, in (mm) ................ 0.004 (0.10)
Exhaust Valve Clearance, in (mm) ................ 0.004 (0.10)
Engine Oil and Filter
Engine Oil Type ................ Yamalube, SAE 10W, SAE 10W-30, 10W-40
API Service Classifications ................ SE or SF
Oil Capacity, qts (L) ................ 1.06 (1.0)
Air Filter Element Part Number ................ 7CT-E4461-21, 7CT-E4451-22
Ignition System
Spark Plug Type ................ NGK BPR4ES
Spark Plug Gap, in (mm) ................ 0.028-0.032 (0.70-0.80)
TCI Air Gap, in (mm) ................ 0.008-0.024 (0.20-0.60)
Spark Plug Torque, Nm (ft-lbs) ................ 20 (14)
Service Intervals
Check Engine Oil Level ................ Every 10 hours
Service Air Filter Element ................ Every 50 hours
Clean and Adjust Spark Plug ................ Every 50 hours
Change Engine Oil ................ Every 100 hours
Clean Fuel Filter ................ Every 100 hours
Clean Fuel Strainer ................ Every 100 hours
Check Fuel Hose ................ Every 100 hours
Replace Spark Plug ................ Every 200 hours
Replace Air Filter Element ................ Every 200 hours
Check Carburetor Adjustment ................ Every 200 hours
Check Breather Hose ................ Every 300 hours
Check and Adjust Idle Speed ................ Every 300 hours
Check and Adjust Valve Clearance ................ Every 300 hours
Replacement Parts
Cylinder Head Gasket. Part Number ................ 7VB-E1181-01
Head Cover Gasket. Part Number ................ 7VB-E1193-01
Crankshaft Oil Seal. Part Number ................ 93102-30801
Spark Plug. Part Number ................ 94702-00819
Fuel Filter. Part Number ................ 7J3-24521-00, 7NJ-24515-01
Fuel Strainer. Part Number ................ 7CT-F4167-00
Air Filter Element. Part Number ................ 7CT-E4451-22
Air Filter Element (Foam). Part Number ................ 7CT-E4461-21
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