Kohler K301 / M12 Complete Engine Rebuild Kit - 12HP | Piston, Rod, Gaskets, Valves, Points

Complete engine rebuild kit for Kohler K301 and M12 12HP engines. This comprehensive kit includes everything needed for a complete engine overhaul: Style A piston assembly, connecting rod, complete gasket set, valves, and ignition points.

Kit Includes:

• Style A piston assembly (piston, Style A rings, wrist pin, clips)
• Connecting rod (1.500" crankshaft journal)
• Complete overhaul gasket set (23 pieces)
• Exhaust valve
• Intake valve
• Breaker points

Compatible Engines:

• Kohler K301 (12HP) - 3.375" bore
• Kohler M12 (12HP Magnum) - 3.375" bore

Piston Sizes Available (3.375" Bore - Style A):

Standard (3.375"):

• 47-874-06-S (replaces 47-074-16)

.010" Oversize (3.385"):

• 47-874-08-S

.020" Oversize (3.395"):

• 47-874-09-S

.030" Oversize (3.405"):

• 47-874-10-S

.040" Oversize (3.415"):

• Available upon request

Connecting Rod Sizes Available (1.500" Journal):

Standard (1.500"):

• 47-067-09-S (primary OEM part)
• 45-067-24 (for engines after serial number 179900003)

.010" Undersize (1.490"):

• 47-067-10-S (most common)
• Alternative: 45-067-10-S, 45-067-25-S

.020" Undersize (1.480"):

• 47-067-13-S

Important Notes:

• Select piston size and connecting rod size from dropdown - STD ships if no selection made
• Connecting rod has 1.500" crankshaft journal
• Complete 23-piece gasket set included
• ⚠️ Bearing plate gaskets are K-series style ONLY
• M12 engines may require different bearing plate gaskets (not included)
• This kit uses Style A piston and rings
• Compatible with Style A piston rings sold separately on our site
• Piston oversizes for rebored cylinders
• Rod undersizes for reground crankshafts
• Measure cylinder bore and crankshaft journal to determine correct sizes
• All components needed for complete engine rebuild

Complete rebuild solution for Kohler K301 and M12 12HP engines. Everything you need for a professional engine overhaul in one comprehensive kit.