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
Coded Grade 1 84.77-84.78 mm
Coded Grade 2 84.78-84.79 mm
Coded Grade 3 84.79-84.80 mm

Piston-to-Bore
Clearance Limit 0.020-0.040 mm
With Piston Coating -0.010-0.030 mm

Piston Pin Bore 20 mm ±0.01 mm

Ring Groove Width:
Compression, Top 1.5 mm +0.04 mm, -0.02 mm
Compression, Bottom 1.75 mm +0.03 mm, -0.01 mm
Oil 3.0 mm +0.03 mm, -0.01 mm

* Measure the piston outer diameter at a right angle (90 degrees) to the piston pin and below the oil ring groove.