basis: 200cc engine casing with Li or GP-crankshaft (107mm rod)
usage: mild tuning
power: 12 hp (estimated)
manufacturer barrel: SIL, India
material: cast iron
port timings: stage 4
manufacturer piston: Mahle (Escorts), India
method: die cast
rings: 2x 2mm chrome, 1x 2mm die cast
compression hight: 39mm
gudgeon pin: 16mm
The stage 4 is a slightly tuned original cylinder. This is done already in the SIL factory. The inlet and exhaust ports are widened and the port timings are raised.
As it is not highly tuned it is still easy to drive which makes it perfect for travelling.
Please check squish clearance, this should be between 1.3 and 2.0mm.
The transfer ports also need some revision
This kit has been rebored to 10-12/100mm piston to bore clearance. We experienced that the original Innocenti clearance of 4/100mm is much to small, so seizures easily can occur. Because of that it may be that our kits are a little more expensive but the satisfaction will prevail the short joy of a cheaper price.
The Components can still be bought with the standard measurements at the old price.
As there occurred some problems in the past, we now include piston clips "made in Germany".