| Engine: | 390cc OHV Clone 13HP |
|---|---|
| Recommended Class: | Modified / Open |
| Target (MAX) RPM: | 7600-7800 |
| Spring Pressure (In / Ex): | 65 lbs Dual Spring |
| Valve Lash (In/Ex): | .003" |
| Ignition Timining: | Pump Gas Not Recommended |
| 110 Octane 34 Deg BTDC | |
| Methanol 38 Deg BTDC | |
| Compression Ratio: | 12.5 to 1 or Higher |
| Intake | Exhaust | |
|---|---|---|
| Open: | 51.6 BTDC | 94.0 BBDC |
| Close: | 93.5 ABDC | 54.8 ATDC |
| Lift: | .3555" | .3555" |
| C/L: | 108.0 ATDC | 108.0 BTDC |
| DUR @ 50: | 254.3 Deg | 254.5 Deg |
