Bore:

....... 2.795 in. Stroke: 1.037 in. (5hp Bore:2.625)

Bolt Torque:

....... Head bolts: 150-160 inch pounds

....... Billet Rod: 150 inch pounds (stock rod 110 in.lbs.)

....... Side Cover: 135 inch pounds

....... Rocker Stud Jam Nut: 100 inch pounds

....... Flywheel Nut: 45 foot pounds

Clearances:

....... Ignition to flywheel air gap: .021

....... Connecting rod to crankshaft journal: .0015-0035

....... Piston to cylinder: .002-.005

....... Valve lash: (intake) .004 (Exhaust) .004 (depending on cam)

Oil Capacities:

....... 18 to 20 ounces

....... Suggest using a racing Synthetic oil, change every 20 min.of use

Fuel:

....... Suggested fuels are standard pump gasoline 87 to 91 octane,

....... Or racing methanol. Racing Gasoline with higher octane can

....... cause higher temps, leading to premature component failure

MOTORSPORT ENGINE SPECS

TECUMSEH OHH SERIES MOTORSPORT ENGINE SPECS

Rod Bolts-----150 inch lbs

Rod clearance-----.0035/.004

Piston to wall-----.005/.006

lash-----.008 depends on camshaft

Head bolts-----12.5 ft.lbs

Cover bolts-----100 inch lbs

Oil-----FHS 62R or Cramac Heavy

450 CHT

6500 on Cast rod

8500 on Billet rod

Stock flywheel key

40 ft.lbs on crank end bolt max

Safty Notes:

....... DO NOT alter flywheel

....... Use additional throttle return spring

....... Use race intended exhaust muffler

....... Use ignition saftey ground shut off switch

....... Vent crankcase into catch can

....... Always use clutch-chain guards

TECUMSEH H50 SERIES MOTORSPORT ENGINE SPECS

IMPORTANT always wear proper saftey equipment on your body!

Need more info or any questions contact Batman