Models UJ, UJS, UJR, UJSR, UJVD
Type Vertical, 4 cycle, L-head
Number of Cylinders 4
Bore and Stroke 2-9/16" x 3-1/8"
Total Piston Displacement in cu. Inches 64.46
Spark Plug Champion J-8 14mm.
Compression Ratio 6.3 to 1
Engine Rotation Counter-Clockwise Viewed from Flywheel End
Reduction Gear Ratio 2.04 to 1
V-Drive Reduction Ratios 1.00 to 1, 1.29 to 1, 1.67 to 1, 2.0 to 1
Fuel Standard Gasoline, 92-94 Octane
Maximum Operating Angle Approx 12 to 15 degrees max.
Length Overall in inches UJVD - 35-13/16", UJ - 26-3/4", UJR - 31-15/16"
Height above crankshaft center line 13-1/8"
Maximum Width in Inches 13-1/8"
Offset - Crank to Prop shaft 1.042"
Base Depth Below Center line in inches 6"
Exhaust Flange National Pipe Thread Size 1-1/4"
Water Inlet National Pipe Thread Size 3/8"
Water Outlet National Pipe Thread Size 3/8"
Fuel Pump Connection 1/8" N.P.T.
Fuel Line - Copper Tubing 5/16" O.D.
Weight of engine, net pounds UJ-310, UJR-330, UJVD-335
Firing Order (No. 1 on Flywheel End) 1-2-4-3
Inlet Valve Opens 5 degrees before TDC
Inlet Valve Closes 50 degrees after LDC
Exhaust Valve Opens 45 degrees before LDC
Exhaust Valve Closes 10 degrees after TDC
Dwell Angle 31 to 34 degrees
Brake Horsepower
RPM 600 1000 1500 2000 2500 3000 3500
UJS-UJSR 4 7.1 11 15 18 --- ---
UJ-UJR-UJVD 5 7.3 11.9 16.2 20 25 30
Carburetor - Zenith 68 Series 7/8"
Reversing Gear - Paragon OXKB
Reduction Gear Paragon
Electrical Equipment UJ-UJR Standard - 12 volt 35 amp Alternator
Piston Skirt Clearance .0015 Feeler to 5 lbs. Pull
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