Identify the engine configuration and intended replacement
Provide the installed engine code, vehicle model and year. State whether the engine is two-stroke or four-stroke and how it is cooled, using known documentation. Distinguish a standard-bore replacement from a proposed larger-bore configuration; neither should be inferred from the product photograph.
Organize the known cylinder and piston dimensions
Send the cylinder or casting reference and label the dimensions already available in your records. Bore and piston-pin diameter are separate identifiers. A displacement description does not replace these details.
- Record the known bore, cylinder height and mounting or stud spacing.
- Identify the piston-pin diameter and matching piston reference if a piston is required.
- Show relevant mounting faces and identifying marks in photographs. State which values are documented and which are measurements from a used part.
Write a component-by-component contents list
List the cylinder, cylinder head, piston, rings, piston pin, retaining clips and gaskets individually as required, not required or still to confirm. Add other components only when your application calls for them. The word “kit” and the items visible in a reference photo do not establish the supplied package.
Keep the purchase request linked to its supporting evidence
Attach the drawing or labelled photographs to the same enquiry line as the engine version and contents list. State the number of cylinders or kits requested, destination and packaging needs. If two versions are being considered, send two clearly identified lines rather than mixing their dimensions.
This guide organizes buying information. It gives no installation or machining instructions. Compatibility, available supply and commercial terms need confirmation for the specific request.
Questions before you enquire
Does a cylinder kit automatically include a cylinder head?
No contents are promised by this reference page. State explicitly whether you need a head, piston, rings, pin, clips and gaskets, and have the offered package confirmed in writing.
Does the same engine displacement establish compatibility?
No. The engine version, cylinder and piston references, bore, pin and mounting details still need to be checked for the specific requirement.
Reference basis
Part names and reference categories come from the ZCY product guide. The linked technical references support the questions to ask; they do not identify a ZCY supplier, stocked item or approved fitment.
Image: original reference extracted from the ZCY product guide.