6
MAIN COMPONENTS’ PARAMETERS AND ESTIMATED
LIFETIME
CYLINDER / PISTON PAIRING
The piston must be replaced within certain intervals, expressed in consumed liters
of mixture. Intervals may vary according to the use the engine, ex: professional
(top performance required) or hobby (top durability).
IAME recommends replacing the piston every 100 liters of use, or earlier, if the
cylinder/piston tolerance exceeds 0.11mm.
If the marking on the piston crown indicates:
-a GREEN dot or with the letter V: the dimension indicated on the piston crown
corresponds at dimension of the liner
-a RED dot or by letter R: add 0.01mm to the measurement marked on the piston
crown to match the liner.
The prescribed cylinder/piston clearance, when a brand new piston is mounted,
is 0.07mm.
The actual diameter of the piston can be checked at 15mm from the base,
perpendicular to the piston pin.
Moreover, the clearance between the tips of the piston ring (installed into the
cylinder) must be between 0.10 and 0.20mm. The clearance can be checked
with a feeler gauge after placing the ring straight into the cylinder.
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