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(Above and belowl Two views of the 900: Compr..sion ratio is 10.8:1
from Wiaeco pistons; intake valves measure 44mm, exhaust valves
40mm; cam timing is 66°-90° intake with 12mm lift and 95°-56° exhaust
with 11 mm',lift, me..ured at zero lift; external oil lin.. feed valve train.
Leoni's 900 has a polished crankshaft with 75055 connecting rods,
which are longer than stock 90055 rods. The Wiseco pistons have just
two rings - one chromed compression, one three-piece oil control - and
the crankcases are bored to 95mm to accept oversize cast iron cylinder
liners. All the gears in the cam bevel drive are polished, and the bevel gears
are shimmed - Leoni says they must be "free, not loose, not tight, but just
free." A window in the rear cylinder's cam drive cover plate allows Leoni
to tell when the Castrol R40 engine oil is warm enough for Adamo to ride
the bike - cold oil collects and fills up the window, and when the oil's
warm enough it's also thin enough that it drains quickly down the bevel
shaft tube and doesn't fill the sight window. Hollow camshafts are fed oil
through external lines fitted to the rocker covers; rockers are lubed
through holes in the cam lobes. The crankshaft oiling system is also
redone, routing oil through a Derale cooler and then to an aluminum block
with three fittings, one to the crankshaft and one to each cylinder head,
with 2.6mm restrictors in each cylinder head feed line to maintain crankshaft oil pressure.
(Below) Adamo at speed on the 900, which has 300mm Srembo cast iron
front discs and a 280mm aluminum rear disc; front calipers are fourpiston, quick-change Srembos; carbs are 41.6mm Maloni-modified
Dell'Ortos; Leoni buih the two-into-one exhaust system. Rear shocks are
13.6-inch Fox Superbike 5hox, positioned by trial-and-error testing.
Leoni's Pantah has the same type of external oiling syste'm as his 900, but
feeds oil to the center of the polished crankshaft; connecting rods are
Carrillo chrome-moly steel. The 41 mm intake valves are timed 60°-90°;
35mm exhausts 90°-60°.
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(Abovel Pantah has hydraulic dry clutch, close-ratio transmission and
standard belt cam drive; ignition is battery-powered with Accel coils.
(Abovel900's dry clutch is an early Ducati NCR (works) part, matched to
an NC R close-ratio transmission; clutch cover comes from early Hailwood
replica. (Selowllgnition rotor is drilled for lightness; note two pickups.
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