Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Piston Diameter and Clearance

NOTE: There are two standard-size pistons (No letter or A, and B). The letter is stamped on the top of the piston. Letters are also stamped on the cylinder block as cylinder bore sizes.

Oversize Piston Diameter
0.25: 90.230 - 90.240 mm (3.5524 - 3.5527 inch)
0.50: 90.480 - 90.490 mm (3.5622 - 3.5626 inch)

Piston-to-Block Clearance
Standard (New): 0.02 - 0.04 mm (0.001 - 0.002 inch)
Service Limit: 0.08 mm (0.003 inch)