Type --------------------------- Kohler, 1 Cylinder, 4 Stroke Cycle,
Air Cooled, "L" Head Engine
Bore ------------------------------------------------ 3.380 Inches
Stroke -----------------------------------------------3.250 Inches
Piston Displacement---------------------------- 29.07 Cubic Inches
Compression Ratio ----------------------------------------- 6 to 1
Max. Comp. at Cranking Speed
(Engine at Operating Temperature} --------110 to 120 PSI at Sea Level
Crankcase Vacuum(Engine Running}--- 5 to 10 Inches Vacuum at Sea Level
Ignition --------------------------------12 Volt Coil, Breaker Points
CYLINDER BORE
Diameter of Cylinder Bore Std. A, B-------------3.3745-3.3785 Inches
.010 Oversize A, B
+ 10 --------------- 3.3845-3.3855 Inches
.020 Oversize A, B
+ 20 --------------- 3.3945-3.3955 Inches
.030 Oversize A, B
+ 30 --------------- 3.4045-3.4055 Inches
Cylinder Bore Must Be Bored or Honed Oversize
If Taper or out of Round
Exceeds ------------------------------------------~005 Inches
PISTON AND PISTON PIN
Diameter of Std. Piston at Top ------------------- 3.356-3.360 Inches
Diameter
of Std. Piston at Top of Skirt
(Measured Just Below Oil
Ring) ------------------ 3.369-3.370 Inches
Diameter
of Std. Piston at Bottom of Skirt --------- 3.371-3.372 Inches
Piston
Pin --------------------------- Full Floating Type Retained In
Place With Two Retainer Rings.
Piston Pin Bore In Piston,
Std. ------------------- .8752-.8754 Inches
Piston Pin Diameter Std. -------------------------.8752-.8754 Inches
.005 Oversize -------------------------- .8802-.8804 Inches
Piston Pin Length------------------------------- 2.735-2.750 Inches
Piston Pin Fit In Piston ----------------------- One Thumb Push Fit
Piston Pin Fit In Connecting Rod ------------------.0003-.0008 Inches
PISTON RINGS
Rings Per Piston ----------------------------(2 Compression-! Oil)
lst(Top)Compression-Chrome, Tapered Face. Relief Indicates Top Side.
Side Clearance -------------- .002-.004 Inches
Width--------------------------- .078 Inches
2nd - Compression -------- Chrome, Relief Indicates Bottom Side
Side Clearance -------------- .002-.004 Inches
Width--------------------------- .078 Inches
3rd - Oil Ring------------------------------ Cast W/Bxpander
Side Clearance -------------- .001-.003 Inches
Width-------------------------- .1870 Inches
Ring End Gap When Installed In Bore ---------------- .010-.020 Inches
Replacement
Ring Width
1st Comp. ----------------- .077-.078 Inches
2nd Comp. ----------------- .077-.078 Inches
3rd Oil Rail-------------- .0235-.0245 Inches
3rd Oil Ring---------------- .134-.135 Inches
CONNECTING RODS
Connecting Rod Length From Center of Pin Hole
To Center
of Bearing Journal ---------------------5.295-5.297 Inches
Piston Pin Hole Diameter In Rod----------------- .8757-.S7t30 Inches
Inside Di~meter
of Rod Journal, Std. ------------ 1.5005-1.5010 Inches
Undersize ------ --------1.4905-1.4910 Inches
Connecting Rod To Crank Journal Clearance --------------.0005-.0015
Connecting Rod To Crank End Play Clearance -------- .007-.016 Inches
CRANKSHAFT AND BEARINGS
Type Main Bearings --------------------------------- Ball Bearings
Crankshaft Rod Journal ------------------------1.4995-l.5000 Inches
Crankshaft Rod Journal Width-------------------- 1.079-1.084 Inches
Crankshaft End Play ------------------------------ .003-.020 Inches
Measured at Bearing Plate and Shim to Proper End Play.
CAMSHAFT
Camshaft End Play -------------------··------------ .005-.010 Inches
Camshaft Pin Diameter --------------------------.4980-.4985 Inches
Camshaft Inside Diameter----------------------- .4995-.5015 Inches
Camshaft Pin to camshaft Clearance ---------------.001-.0035 Inches
Camshaft
Pin to Breaker Cam Clearance ----------- .001-.0025 Inches
VALVE LIFTERS
Valve Lifter Outside Diameter In Block------------ .6232- .6237 Inches
Valve Lifter Bore In Block -----------------------.6245-.6255 Inches
Valve Lifter To Block Clearance -------------------.OU8-.UU23 Inches
VALVES
Intake Valve Tappet Clearance (Cold) ----------------.008-.010 Inches
Exhaust Valve Tappet Clearance (Cold! --------------.017-.020 Inches
Angle of Valve Face - Intake and Exhaust ---------------- 44 Degrees
Valve Length - Intake and Exhaust ---------------- 4.572-4.582 Inches
Max. Valve Face Runout - Intake ----------------------- .0015 Inches
Max. Valve Face Runout - Exhaust -----··-----------------.003 Inches
Valve Head Diameter - Intake ------------------- 1.370-1.380 Inches
valve Head Diameter - Exhaust ------------------ 1.120-1.130 Inches
Valve Stem Diameter - Intake -------------------- .3105-.3110 Inches
Valve stem Diameter - Exhaust------------------ .3090-.3095 Inches
Intake Valve stem to Guide Clearance -------------- .001-.0025 Inches
Exhaust Valve Stem to Guide Clearance ------------ .0025-.004 Inches
VALVE SEATS
Seat Angle - Intake and Exhaust -------------------------45 Degrees
Max. Seat Runout Intake and Exhaust ---------------------.002 Inches
Seat Width - Intake -------------------------------- .037-.045 Inches
seat Width - Exhaust------------------------------ .031-.062 Inches
Exhaust seat Insert ----------------------------------- Replaceable
Outside Diameter
of Exhaust Insert ------------- 1.2535-1.2545 Inches
Exhaust Insert Height ------------------------------.219-.221 Inches
VALVE GUID&S
Valve Guide Length ----------------------------------- 2.125 Inches
Valve Guide Outside Diameter --------------------.6260-.6265 Inches
Valve Guide
to Block (Press Fit ) ------------------ .0005- .002 Inches
Valve Guide Inside Diameter - Before Installing ------ .307-.308 Inches
Ream Valve Guides After Installing to -----------.312-.313 Inches
VALVE SPRINGS
Spring Free Length -----------------------------------1.793 Inches
Spring Pressure When Comp. to 1.469 In. (Valve Closed) -27
to 31 Lbs.
Spring Pressure When Comp. to 1.165 In. (Valve Qpen) ---54 to 62 Lbs.
GOVERNOR
Governor stub Shaft Outside Diameter ------------- .3735-.3740 Inches
Governor Gear Bore for stub Shaft ----------------.3745-.3755 Inches
stub Shaft to Governor Gear Clearance ------------- .0005-.002 Inches
Governor Spring Free Length with 2 Lb. Pre-Load -------- 2.62 Inches
Governor Spring Extended to 2.88 Inches ------------ 5.5 to 6.5 Inches
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