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Valve spring retainer

Valve cap

Valve retainer

Breather

Exhaust valve

Gear

Ring set

Governor Spool

Push Rod. Opens and closes the valves when actuated by the timing gear and valve tappets

Push rod

Ring Set, 450-550 Series, 3, 3.75, 4 & 5 HP Horizontal/Vertical, Models 90000, 10A900, 130000

Piston assy (qsearch)

MANIFOLD 20 HP KOHLER

Gear-2.968od 1.004id

Piston assembly + .020 oversize
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