Denco S3/KH400 Porting Specs

Exhaust	86 deg. ATDC, 30.3mm from cylinder top
Transfer	122 deg. ATDC, stock
Intake	105 deg. ABDC, remove 2.1mm 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	2.9mm BTDC
Piston Clearance	.0035" with stock pistons
Cut Heads	.025"
Chambers	Denco slienced 01-5 or 01-5C
Main Jet	92.5 to 105 (start rich)
Spark Plugs	Champion L2G
Optional	Competition clutch springs 03-2
Max. H.P.	58 at 9000 RPM