The light weight and durable alloy cylinder head takes care of good heat dissipation. This thermal stability is supported by the technical layout for a reliability and maximum power.
The heads are specifically designed for the Polini 210cc Alloy tuning cylinder and dyno-tested.
Tighten the head nuts crosswise at best with a torque wrench to 1.7-2.2kgm. Use fresh washers, if the old ones show sign of wear.
-Head volume ca.22.5cc
-Combustion ca.10.3:1 with 57mm stroke
-Combustion ca.10.8:1 with 60mm stroke
-Squish clearance 1.2