Hero Genuine Engine Cylinder Block for Xtreme 125R OBD-II | 12100AANB00S

Hero Genuine Engine Cylinder Block – 12100AANB00S

This listing is for the Hero Genuine Engine Cylinder Block identified by exact part number 12100AANB00S. Select this component by complete part number and chassis/VIN-based EPC confirmation—not by visual similarity, shared engine capacity or a broad model-family name.

Confirmed Compatibility

Compatibility is limited to the exact EPC-supported applications listed below. Do not assume compatibility with another model, generation or variant merely because the component looks similar or shares an engine family.

• Hero Xtreme 125R OBD-II (Apr 2025)

Fitment Note / Return Prevention Note

• Match every letter, number and suffix in the SKU.
• Confirm the exact motorcycle or scooter model, variant, production generation and applicable EPC assembly.
• Compare the old part's side, connector, mounting points, dimensions and surrounding components before opening the package.
• Do not install, energise, fill, lubricate, machine or modify the component merely to test compatibility.
• Installed, electrically tested, fuel-exposed, oil-exposed, marked, scratched or modified parts cannot be treated as unused returns.

What This Product Is

• Hero Genuine engine cylinder block / barrel assembly
• Official description: Cylinder Comp.
• Hero part number: 12100AANB00S
• Catalogue-format part number: 12100-AAN-B00
• Common buyer names: cylinder block, cylinder barrel, engine block, bore block and cylinder body
• Engine location: between the crankcase and cylinder head
• Primary function: guides the piston and forms the engine’s working cylinder bore
• Catalogue quantity: one cylinder per compatible engine
• Supply form: one manufacturer-packed cylinder assembly

Key Features

• Genuine Hero internal-engine component
• Precision-machined bore and mounting surfaces
• Supports correct piston movement and combustion sealing when assembled with matching parts
• Suitable replacement when the original cylinder is scored, seized, cracked or outside service limits
• Model-specific cylinder height, bore, stud pattern and oil-passage arrangement
• Exact OEM part-number matching reduces wrong-cylinder and wrong-gasket orders
• One cylinder block assembly supplied
• Current Hero MRP reference: ₹2,490 inclusive of taxes

What You Will Receive

• 1 × Hero Genuine Cylinder Comp.
• Part number: 12100AANB00S
• One manufacturer-packed cylinder block / barrel assembly

Not included:

• Piston
• Piston-ring set
• Piston pin
• Piston-pin clips
• Cylinder-base gasket
• Cylinder-head gasket
• Cylinder head
• Valves, camshaft or rocker components
• Cam chain, tensioner or guides
• Connecting rod or crankshaft
• Studs, dowels, nuts, washers or bolts unless physically present in the sealed pack
• Engine oil
• Machining, honing or boring work
• Installation labour

Technical Details

Installation Note

Cylinder replacement requires complete top-end engine dismantling, precision measurement and correct cam-timing assembly. Installation should be performed by a trained Hero motorcycle engine technician.

Before Installation

• Confirm the old and new cylinder part numbers
• Inspect the crankcase cylinder seating surface
• Measure the piston and confirm the matching piston number
• Inspect the piston skirt and ring grooves
• Check the piston pin and connecting-rod small end
• Measure piston-to-cylinder clearance
• Check every ring’s end gap in the replacement cylinder
• Obtain new model-correct cylinder-base and head gaskets
• Inspect the cylinder-head sealing surface
• Check the cam chain, tensioner and guides
• Identify the root cause of the original cylinder damage

During Installation

• Clean all mating surfaces without gouging the aluminium
• Do not use excessive sealant
• Install the correct dowels and gaskets
• Lubricate the piston, rings and cylinder with clean specified engine oil
• Install piston rings in the correct grooves and orientation
• Position ring gaps according to the service procedure
• Use a proper ring compressor or approved installation method
• Do not force the cylinder over the piston rings
• Route the cam chain correctly through the cylinder tunnel
• Set cam timing exactly
• Tighten cylinder-head fasteners in the prescribed sequence and torque

After Installation

• Rotate the engine manually before starting
• Recheck cam timing and valve clearance
• Fill with the specified engine oil
• Confirm adequate lubrication
• Check engine compression
• Listen for piston slap, knocking or abnormal mechanical noise
• Inspect for oil and compression leakage
• Monitor engine temperature
• Follow the technician’s recommended running-in procedure

Buyer-Focused FAQs

How should fitment be confirmed?
Match the complete part number with the motorcycle's chassis/VIN-based Hero EPC. A shared model name, appearance or engine capacity is not enough.

Can the part be installed only to check compatibility?
No. Confirm the EPC, physical design and related assembly before opening or installation.

What will be supplied?
One Hero Genuine component under part number 12100AANB00S, subject to the exact contents of the sealed manufacturer package.