Twin-cylinder four-stroke air-cooled rebirth of a Ducati 500SL

Engine

Twin-cylinder, 90° L-type configuration, 4-stroke, air-cooled, mounted on closed double cradle frame.

Bore 82mm
Stroke 61.5mm
Capacity 649.5cc
Compression ratio 10:1
Max power 56.5HP @ 8400 rpm
Max torque 40.5 lb. ft. @ 5750 rpm
Max engine speed 8900 rpm

Valve Timing

-612549 +612550
Induction before TDC 40° 39°
after BDC 70° 80°
Exhaust before BDC 67° 80°
after TDC 43° 38°

Operation and clearance of tappets, cold motor condition:

Intake and exhaust opening rocker arm 0.10mm (0.0039″)
closing rocker arm 0.00%0.02mm (0.00%0.0008″)
NO COMMENTS
Post a comment