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Aftermarket Yamaha Aerox 155 Cylinder Heads — Bulk Supply for B2B Buyers Worldwide

Aftermarket Yamaha Aerox 155 Cylinder Heads — Bulk Supply for B2B Buyers Worldwide

We supply aftermarket Yamaha Aerox 155 cylinder heads to scooter engine rebuilders, aftermarket distributors, and OEM brands across Southeast Asia and beyond. The Aerox 155 runs the 155cc liquid-cooled SOHC 4-valve Blue Core engine with Variable Valve Actuation (VVA), and that head is shared with the NMAX 155 and related VVA models, so one head family covers several high-volume platforms. We cast from aluminum alloy, CNC-machine the combustion chamber, valve seats, VVA cam area, and sealing face, and pressure-test every unit. MOQ 500 pieces per SKU, sample orders accepted, 17 years of mass production, ISO 9001 certified.

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Technical Specifications: Yamaha Aerox 155 Cylinder Heads

The Aerox 155 head is a scooter head, not a dirt-bike head, and it has one feature that defines it: Variable Valve Actuation. The engine is a 155cc liquid-cooled four-stroke SOHC with four valves and fuel injection, bore and stroke 58 × 58.7mm, internally the GDR155/GPR155 Blue Core unit. VVA switches between two intake cam profiles at around 6,000 rpm — a low-rpm lobe for torque and a mid-to-high lobe for top-end — so the head has to accommodate the VVA mechanism and hold valve-seat and cam accuracy through it. The most useful sourcing fact is that this head is shared with the NMAX 155 and the wider 58mm VVA family. A distributor can stock one head family and serve Aerox, NMAX, and related models. Our motorcycle cylinder head program covers the Aerox 155 across its versions.

SpecificationStandard Value
Engine PlatformYamaha Aerox 155 (GDR155 / GPR155 Blue Core). Head shared with NMAX 155 and the 58mm VVA family — confirm model and year in RFQ.
Engine Type4-stroke, single cylinder, SOHC, liquid-cooled, 4-valve, fuel-injected, with VVA
Displacement155cc (nominal). Note: distinct from the Indonesia-only two-stroke Aerox and the older Aerox 125 LC.
Bore × Stroke58.0mm × 58.7mm (OEM Yamaha spec)
Valve Configuration4-valve (2 intake / 2 exhaust), SOHC
VVA SystemVariable Valve Actuation — switches between two intake cam lobes near 6,000 rpm. Head machined to accept the VVA rocker/cam assembly and OEM valve clearances.
Fuel SystemFuel injection (FI). Intake port matched to the FI/VVA layout.
CoolingLiquid-cooled with optimized coolant pathway around the compact combustion chamber
Valve Seat InsertsSintered alloy-steel seats, induction-shrunk fit
Valve GuidesPress-fit copper-alloy guides, reamed to OEM tolerance
Valve Clearance ReferenceMachined to OEM-spec clearance so heads check and adjust within the standard maintenance window. VVA-platform clearances are tighter than larger engines — we hold the seat geometry accordingly.
MaterialA356 aluminum alloy (JIS AC4CH equivalent), T6 heat treated
Casting MethodGravity die casting (standard for this scooter head). Low-pressure die casting (LPDC) available for premium-tier density.
Deck Flatness Tolerance≤ 0.02mm (CMM verified on every unit)
Valve Seat Concentricity≤ 0.025mm
Supply OptionsBare casting / CNC-machined raw / Fully assembled (valves, springs, retainers, seals, and VVA-area components on request)
Surface FinishHanging shot blasted (matte). Powder coating or painting available on request.


Key Sourcing Information at a Glance

ParameterDetail
Product TypeAftermarket Aerox 155 cylinder heads — bare castings, CNC-machined raw, or fully assembled. Built to fit the Yamaha Aerox 155 engine; this is a replacement part, not an original-equipment Yamaha component.
MOQ500 pieces per SKU for standard variants. Sample orders of 50-100 pieces accepted for first-time buyers.
Lead Time30-45 days for stock variants. 60-75 days for new tooling or performance variants.
Cross-Model CompatibilityHead shared across the 58mm VVA family: Aerox 155 / NVX 155, NMAX 155, and related models. One SKU can serve multiple platforms — confirm exact model and year, since some versions differ in detail.
MaterialA356 aluminum (JIS AC4CH equivalent), T6 heat treated. Material certificates provided.
Quality Verification100% pressure leak testing on every unit. CMM dimensional verification of valve seats, deck flatness, and VVA-area features. Spectrometer-verified material. Batch records archived for 5 years.
PackagingStandard export carton, neutral packaging, or private-label cartons. Model-coded SKU labeling for distributors stocking Aerox and NMAX in parallel.
Shipping TermsFOB Ningbo/Shanghai, CIF, or DDP. Export experience to Indonesia, Thailand, Vietnam, Malaysia, Philippines, and other scooter markets.
Documentation ProvidedMaterial composition certificate, CMM inspection report, leak test pass record, batch traceability, ISO 9001 certificate, commercial invoice, packing list, certificate of origin.


How to Source the Right Aerox 155 Head: Shared Platforms and Pitfalls

The Aerox 155 is a high-volume scooter, and sourcing its head is mostly about confirming you have the 155cc VVA engine and then taking advantage of how widely that head is shared. Get the model identification right first. The 155cc Blue Core VVA Engine All Aerox 155 models use the liquid-cooled 155cc SOHC four-valve fuel-injected engine with VVA, internally GDR155/GPR155, with a 58 × 58.7mm bore and stroke. This is the engine you are almost certainly sourcing for. The compact combustion chamber and optimized coolant pathway are built around this layout. Shared With NMAX 155 and the VVA Family This is the key commercial point. The Aerox 155 head is shared with the NMAX 155 and is closely related across the 58mm VVA family that also underpins NVX and other Yamaha 155 VVA models. A distributor or rebuilder can hold one head family and serve several platforms, which lowers inventory complexity and raises stock turnover. Confirm the exact model and year, because some versions differ in port or fitment detail. Aerox Versions (V1, V2) The Aerox 155 has run in successive versions since its 2016-2017 launch. Most head architecture carries across, but emissions updates (for example BS6/OBD2 in some markets) and version changes can affect detail. Quote the model year so we ship the correct casting. Why VVA changes the head VVA switches between two intake cam lobes near 6,000 rpm to broaden the torque curve. The head houses the VVA rocker and cam arrangement, so valve-seat position and clearance accuracy matter for the system to switch cleanly and hold OEM valve clearances through service. A head machined loosely around the VVA area causes clearance drift and rough switching. We hold the seat geometry and cam-area features to OEM tolerance. Common avoidable mistakes when buying Confusing the modern Aerox 155 with older Aerox models. There was an Indonesia-only two-stroke Aerox and an older Aerox 125 LC. Their heads are unrelated to the 155 VVA engine. Always confirm the 155cc Blue Core engine. Ordering without checking the shared-platform fit. Because the head spans Aerox and NMAX, give us the exact model and year so the right SKU ships, rather than assuming all 155 VVA heads are identical. Ignoring valve and seat condition on assembled heads. A scooter head still lives or dies on its valve job. Ask whether seats are freshly cut and concentric and whether new guides and seals are included. Skipping the leak test question. A porous casting or poor seat seal on a liquid-cooled head shows up as overheating or lost compression. Confirm the supplier pressure-tests every head, not a sample.

Aftermarket Yamaha Aerox 155 Cylinder Heads — Bulk Supply for B2B Buyers Worldwide

Who We Supply

For Scooter Engine Rebuilders

Mixed-platform orders supported across the Aerox 155 and NMAX 155 head family (500-2,000 pieces per SKU). Most scooter rebuilders we supply in Southeast Asia keep parallel stock because workshops service Aerox and NMAX side by side. We ship with model-coded SKU labels to keep platforms separate in the warehouse and include a CMM report on every batch. Sample qualification runs of 50-100 pieces accepted before bulk commitment.


For Aftermarket Distributors

Private label and neutral packaging available. We support drop-shipping to consolidation warehouses across Jakarta, Bangkok, Hanoi, Kuala Lumpur, and Manila, plus European entry ports for the X-MAX/NVX side of the family. The Aerox 155 head moves in volume because the scooter sells in huge numbers across the region and sees regular top-end service. Distributors stocking multiple Yamaha 155 SKUs typically run monthly or quarterly consolidated shipments.


For OEM & Private-Label Brands

Long-term supply contracts with capacity reservation. The VVA head has tight tolerances around the seat geometry and cam area. We supply heads to listed motorcycle manufacturers under multi-year OEM agreements, accept proprietary CAD (STEP/IGES), and run strict build-to-print protocols. In-house tooling development typically takes 60-75 days from approved DFM to first-article approval.


For Fleet & Delivery Operators

High-volume fleet supply. Delivery and ride-hailing fleets across Southeast Asia run Aerox and NMAX scooters at high mileage, so top-end parts demand is steady and predictable. We support scheduled bulk supply with consistent quality batch to batch, model-coded packaging, and the documentation fleet buyers need for import and warranty handling.


Frequently Asked Questions

What is your minimum order quantity for aftermarket Aerox 155 cylinder heads?

Standard MOQ is 500 pieces per SKU for variants in our production library, covering the Aerox 155 VVA head and its shared NMAX 155 fitment. Sample qualification orders of 50-100 pieces are accepted for new clients. For long-term OEM and fleet contracts, MOQ is structured around your annual volume forecast.

Is the Aerox 155 head the same as the NMAX 155 head?

Yes, in large part. The Aerox 155 and NMAX 155 use the same 155cc Blue Core VVA engine family, and the head is shared across them and related 58mm VVA models. Some versions differ in minor port or fitment detail by year and market, so confirm the exact model and year. This shared fitment is the main reason distributors like this part — one head family covers several scooters.

What is VVA and how does it affect the cylinder head?

VVA, or Variable Valve Actuation, switches between two intake cam lobes near 6,000 rpm — a low-rpm lobe for torque and a higher-rpm lobe for top-end — to broaden the powerband. The head carries the VVA rocker and cam arrangement, so valve-seat position and clearance accuracy directly affect how cleanly the system switches. We machine the seat geometry and cam-area features to OEM tolerance so the VVA works as intended.

How do I confirm I have the right Aerox engine?

The Aerox 155 you are almost certainly sourcing for is the liquid-cooled 155cc SOHC four-valve VVA engine (GDR155/GPR155), bore and stroke 58 × 58.7mm. Avoid confusing it with the older Indonesia-only two-stroke Aerox or the Aerox 125 LC, which use unrelated heads. Send a photo of the engine number or the model and year and we will confirm the correct head within 24 hours.

Do your assembled heads come with valves installed?

Fully assembled heads ship with valves, springs, retainers, and seals installed, with the valve seats freshly cut and concentricity verified; VVA-area components can be included on request. Bare castings and CNC-machined raw heads do not include the valvetrain. Tell us which supply state you need in your RFQ.

Can one head SKU serve both Aerox and NMAX in my warehouse?

Yes, that is a common setup. Because the head is shared across the Aerox 155 and NMAX 155, distributors hold one head family and serve both. We provide model-coded SKU labeling so your warehouse can track which scooters a given batch fits, and confirm fitment by model and year before shipping.

Will the head hold OEM valve clearance through normal service?

Yes. We machine the head to OEM-spec valve clearance and seat geometry so heads check and adjust within the standard maintenance window. VVA-platform clearances are tighter than on larger engines, so holding seat geometry is important — a loosely machined head causes clearance drift and rough VVA switching. CMM verification on every unit keeps this consistent.

What material and casting method do you use?

Primary alloy is A356 aluminum (JIS AC4CH equivalent), T6 heat treated, with material certificates. Standard process for this scooter head is gravity die casting; low-pressure die casting is available for a higher-density premium tier. All material is spectrometer-verified before melting.

What is the typical lead time, and do you export to my market?

30-45 days for variants in our standard library, from PO confirmation to FOB-ready, and 60-75 days for new tooling or performance variants. We have export experience to Indonesia, Thailand, Vietnam, Malaysia, the Philippines, and other scooter markets, with FOB, CIF, and DDP terms and full export documentation.

What other Aerox 155 engine parts do you supply besides cylinder heads?

Our primary focus is cylinder heads. We also produce engine covers and intake-related castings, and can quote cylinder kits and crankcase components for the Aerox/NMAX 155 platform on request. For distributors building a full Aerox 155 top-end range, list the parts and volumes in your RFQ for a consolidated quote.

Why B2B Buyers Source Aerox 155 Cylinder Heads From Feiya

• One head family across Aerox 155 and NMAX 155 — we hold tooling and CMM reference data for the shared 58mm VVA platform, so a single SKU serves multiple high-volume scooters in your warehouse.

• VVA-area accuracy held to OEM tolerance — valve-seat geometry and cam-area features CMM-verified on every unit, so the VVA system switches cleanly and clearances stay in the standard service window.

• 100% pressure leak testing — every liquid-cooled head is leak-tested before it ships, because a coolant or seat leak on a scooter head means an overheating complaint in the field.

• Largest cylinder head manufacturer in Yueqing City — 17,000+ m² facility, 5,000+ tons annual aluminum casting capacity, 125+ CNC machining centers, built for high-volume scooter parts supply.

• ISO 9001 certified facility — recognized as a National High-Tech Enterprise and a Technology-Based SME of Zhejiang Province, supplying listed motorcycle brands under multi-year OEM contracts.

Get a Quote for Your Aerox 155 Cylinder Head Requirements

Send your Aerox model and year (and whether you also stock NMAX 155, since the head is shared), target volume, supply state (bare casting, CNC-machined raw, or fully assembled), destination port, and preferred Incoterms. For OEM and private-label programs, include technical drawings (STEP/IGES) or OEM sample reference photos and any packaging or labeling requirements. For fleet supply, tell us your scheduled volume so we can reserve capacity. Our engineering team responds within 24 hours.