K241 ENGINE SPECIFICATIONS
Type-------- ----------- Kohler, 1 Cylinder, 4 Stroke Cycle
Air Cooled, "L" Head Engine
Bore ----------------------------------------- 3.250 Inches
stroke---------------------------------------------2.880 Inches
Piston Displacement ----------------------------- 23.9 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)--- 5to lOinches Vacuum at Sea Level
Jgnf.tion -------··--------------------- 12 Volt Coil, Breaker Point
CYLINDER BORE
Diameter of Cylinder Bore Std. A, B ------------ 3.2505-3.2545 Inches
.010 Oversize A, B
+ 10--------------- 3.2605-3.2615 Inches
,020 Oversize A, B + 20 a.2705-a.z715 Inches
,030 Oversize A, B
+ 30 --------------- 3.2805-3.2815 Inches
CyliDder 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 Bottom of Skirt ------- 3.2470-3.2480 Inches
Diameter of Std. Piston at Top of Skirt ---------- 3.2425-3.2535 Inches
(Measured Just Below
Oil Ring)
Diameter of Std. Piston at Top ------------------- 3.218-3.220 Inches
Piston
Pin -------------------------- Full Floating Type, Retained In
Place With Two Retainer Rings.
Piston Pin Bore in Piston Std. -------------------- .8595-.8596 Inches
Piston Pin Diameter std. ------------------------ .8591-.8593 Inches
.005 oversize------------- .8641-.8643 Inches
Piston
Pin Length------------------ 2.738-2.753 Inches
Piston Pin Fit in Piston (Select Fit) -------------- .0000-.0003 Inches
Piston
Pin Fit in Connecting Rod ----------------- .oooa-.oooa Inches
PISTON RINGS
Rings Per Piston --------------------------- (2 Compression-!
Oil)
lst(Top)Compression-Cbrome, Taper Face. Relief Indicates Top Side
Side Clearance-------------- .002-.004 Inches
Width ---------------------- .093-.094 Inches
2nd Compression-Chrome, Relief Indicates Bottom Side
Side Clearance ------------ .0015-.0035 Inches
Width--------------- .093-.094 Inches
3rd Oil Ring----------------- Cast W/Ezpander
Side Clearance --------------.001-.003 Inches
Width-------------------- .1860-.1870 Inches
Ring End Gap - When Installed in Bore -------------- .010-.020 Inches
Replacement Ring Width
·1st. Comp. ------- .0925-.0935 Inches
2nd. Comp. --------------- .0665-.0675 Inches
2nd. Comp. Rail----------.0235-.0245 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------------- 5.560-5,562 Inches
Piston Pin Hole Diameter in Rod----------------- .8596-.8599 Inches
Inside Diameter of Rod Journal, Std. ------------ 1.5005-1.5010 Inches
Underslze -------------- 1,4905-1.4910 Inches
Connecting Rod
to Crank Journal Clearance-------- .0005-.0015 Inches
Connecting Rod
to Crank End Play Clearance------- .007-.016 Inches
CRANKSHAFT AND BEARINGS
Type
11,fain Bearings --------------------------- Ball Beartngs
Crankllhaft Rod Journal ------------------
1.4995-1.5000 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 ------------------.0008-.0023 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 GUIDES
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 Open) --- 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 Lbs. Pre-Load -------2.62 Inches
Governor Spring Extended to 2.88 Inches------------ 5.5
to 6.5 Pounds
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