The POLINI 70cc ALU is the entry in the world of Polini aluminium cylinder kits.

The Polini 70 ALU is cast in the finest and thermally preferable aluminium and covered with a hard Nikasil coating. The ALU offers the finest racing technology. Amply dimensioned channel cross sections and sporty control times let it turn to over 11.000 rpm with the right components. The outlet layout has been trimmed to maximum slot width with the very attractive sawtooth technology. The ?teeth in the outlet prevent the piston rings from threading into the outlet channel.

Thanks to the thermally clearly superior aluminium, which emits the heat much better than grey cast iron, the ALU can be compressed higher and tuned more crisply.

With such speed orgies, the larger carburettor and a racing exhaust with a short resonance length is of course obligatory. The necessary tuning work is then rewarded with a speed bullet, which easily cracks the 10,000 mark.
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General
Performance class
Sport
 
Piston pin
Diameter
10 mm
 
Spark plugs
Thread type
M14x1,25
Thermal value NGK
B9HS
Spark plug thread
kurz
 
Cylinder
Drill hole
47 mm
Type of cooling
luftgekühlt
Displacement
68 cm³
Motor type
2-Takt
Material
Aluminium
Piston raceway material
Keramik
Cylinder gasket set included
ja
Cylinder head included
ja
Outlet shape
1-teilig (verzahnt)
Exhaust assembly
Flansch
Flange type
2-Schrauben
Distance between exhaust studs
48 mm
Threaded exhaust studs
M6
Number of boost ports
1
Number of transfers (incl. boost ports)
5
 
Crankshafts
Stroke
39.2 mm
 
Piston
Number of piston rings
1
Piston manufacturing method
gegossen
 
Piston rings
Piston ring type
Rechteck-Ring
Piston ring thickness
1,0mm
 
Piston clips
Piston clip type
Doppel G-Typ
Wire gauge Piston clip
1,0mm
 
Cylinder heads
Cylinder head type
einteilig
 
OEM numbers (for comparison purposes only)
Scooter Center:
P1660079
Polini:
166.0079, 1660079, P166.0079, P1660079