Denco H2 Porting Specs

Exhaust

87.25 deg. ATDC, 35mm from cylinder top

Transfer

122 deg. ATDC, stock

Intake

100 deg. ABDC, remove 3.5mm from intake side of piston skirt

Exhaust Port Width

Stock, DO NOT widen, raise entire port roof maintaining stock shape as closely as possible.

Ignition Timing

Stock, set precisely

Piston Clearance

.0038" with stock pistons

Cut Heads

.030"

Chambers

Denco slienced 01-1 or 01-1C

Main Jet

107.5 to 115 (start rich)

Spark Plugs

Champion L55G

Optional

Competition clutch springs 03-1
34mm carbs

Max. H.P.

95 at 8700 ROM