Denco
H1 Porting Specs
Exhaust |
87.5 deg. ATDC, 33.8mm from cylinder top |
Transfer |
120.5 deg. ATDC, stock |
Intake |
100 deg. ABDC, remove 2mm 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 |
3.46mm BTDC for all year models |
Piston Clearance |
.0028" with stock pistons |
Cut Heads |
.025" |
Chambers |
Denco slienced 01-3 or 01-3C |
Main Jet |
102.5 to 107.5 (start rich) |
Spark Plugs |
Points: Champion
L2G |
Optional |
Competition clutch
springs 03-1 |
Max. H.P. |
72 at 8500 ROM |