Quick answer: a motorcycle valve-train RFQ should identify the engine family, the exact component or assembly, the part’s dimensions and the evidence used to confirm fitment. A model name or engine displacement by itself is not enough to approve a bulk order.
The current VOBOM catalog groups several different valve-train items: CG125/CG150 and CG200/CG250 upper rocker-arm assemblies, a DY90/DY100/DY110 camshaft, a CG125/CG150 valve guide, and valve cotters listed for several engine references. These listing names are useful starting points; they are not a guarantee that every variant within a family is interchangeable. This guide gives buyers a repeatable way to verify the exact configuration.
Which valve-train item is on the purchase list?
“Valve parts” can mean a small retaining piece, a single guide, a camshaft, a rocker assembly or a complete cylinder-head assembly. Those are different quote lines. First record the buyer’s own SKU and the requested item form. If the repair list says “rocker,” clarify whether it means one rocker, a matched pair, a complete upper assembly or the cylinder-head assembly that carries it.
- CG125 / CG150 pushrod upper rocker-arm assembly and CG200 / CG250 pushrod upper rocker-arm assembly are separate catalog listings.
- The DY90 / DY100 / DY110 camshaft is a different component from a rocker assembly.
- The CG125 / CG150 valve guide and valve cotter listings are small parts with their own dimensions and installation details.
Keep an assembly’s included pieces on the same quotation line. Ask the supplier to state in writing what is included, what is sold separately and whether any fasteners, adjusters or matching parts are part of the quoted set.
How should the engine family and fitment reference be recorded?
Start with the vehicle make, exact model, production year if known, engine code and the marking on the removed component. Add the motorcycle’s market or country when the same name is used for different variants. If the buyer has an engine number or a parts-catalogue reference, include a clear photo of it. Do not replace these details with a broad description such as “125 cc motorcycle.”
Some catalog entries name pushrod engine families, while others identify a model series. Treat each as a reference that needs confirmation. Ask the supplier to identify the matching engine version and provide the basis for that match: a drawing, dimensioned sample, part code, or a written comparison with the buyer’s original part.
- Photograph the complete engine side and the part in its installed position.
- Photograph all markings, casting codes and the removed part next to a ruler.
- Record whether the request is for a replacement, an upgrade or a different assembly configuration.
- Keep left/right, intake/exhaust and front/rear position labels explicit whenever they apply.
What dimensions and details matter for each component?
Ask for dimensions that distinguish the part rather than relying on an attractive product photo. For a rocker assembly, confirm mounting points, shaft or pivot dimensions, adjuster arrangement and whether the quoted item is one piece or a set. For a camshaft, request overall length, journal dimensions, lobe positions and any part-code or timing reference shown on the drawing. The listing does not publish all these measurements, so the seller should confirm them against the intended sample.
For a valve guide, request the inside diameter, outside diameter, overall length, shoulder or flange shape and the intended valve-stem reference. For cotters or keepers, confirm the exact valve-stem and retainer combination, profile and quantity per set. These are measurement prompts, not assumed specifications: the buyer should have the supplier fill the values from a drawing or approved sample.
How do you compare assemblies with single replacement pieces?
Compare like with like. A complete rocker assembly should not be priced against a single rocker arm; a valve cotter pack should not be compared with a cylinder-head set. Put the unit of sale, pieces per set and included hardware in separate fields. Ask for a photograph of the packed sample and a packing list that uses the same SKU names as the quote.
When a supplier offers a “compatible” alternative, request a side-by-side dimension sheet and a written list of the changes. Similar appearance does not establish the same pivot location, valve-stem size or cam timing. If the alternative uses a different code or casting, note it as a separate line and approve its sample independently.
What should the first sample inspection check?
Use the first sample to confirm the points that matter to the installation and repeat order. Match the received label to the quotation, compare the critical dimensions with the approved drawing, check the finish and visible machining, and confirm the assembly’s included pieces. If a qualified technician is available, test-fit the sample on the intended engine before authorizing production. Record any deviation with a close photo and a measurement rather than writing only “does not fit.”
Keep one approved reference sample or an identified photo set for future orders. Record the sample date, supplier revision, buyer SKU and approval status. If a supplier changes the tooling, material or assembly contents, request a new sample or written change approval before replenishment.
What should a wholesale valve-train RFQ include?
| RFQ field | What the buyer should provide or request |
|---|---|
| Part identity | Buyer SKU, listing or original part number, and single part versus complete assembly. |
| Application | Make, model, year, engine code, market and installed position where relevant. |
| Evidence | Photos of markings, installed position, original part and a scale reference. |
| Dimensions | Supplier-filled drawing values for the distinguishing surfaces and mounting points. |
| Commercial terms | MOQ per SKU, quantity breaks, sample terms, lead time and quote validity. |
| Packing | Pieces per set, individual protection, inner-pack count, carton size and gross weight. |
Ask the supplier to return the quote with the same buyer SKU and engine reference on every page. A spreadsheet with one row per configuration makes it easier to compare prices and prevents a low price for one variant from being applied to another.
Frequently asked questions
Does a CG125 label prove the part fits every CG125 engine?
No. A model-family reference narrows the search but does not establish fit across all years, markets or engine variants. Confirm the engine code, part number and distinguishing dimensions with the supplier.
Can the same cotter or valve guide be used because the displacement is similar?
Do not assume that. Confirm the stem, retainer or guide dimensions and the exact engine reference against the old part or an approved drawing.
What if the original marking is unreadable?
Send clear photos of the complete engine, the removed part from several angles, measurements and the buyer’s intended application. Ask the supplier to state which details remain uncertain before quoting a production quantity.
Next step for wholesale buyers
Browse the motorcycle parts catalog and its engine valve-train parts category, select the closest valve-train listing, and send the exact engine reference, part photos, quantity and destination through the wholesale RFQ form. Ask for the dimensions and assembly contents in writing. Approve the sample against that written record before placing a repeat or bulk order.