Hero Genuine Standard Piston for HF 100, HF Deluxe, HF Dawn, Splendor Plus, Splendor Pro, Splendor NXG & Passion Pro | Piston Only | 13101AAF00099S

Hero Genuine Standard-Size Piston – 13101AAF00099S

Restore the specified piston and cylinder relationship in compatible Hero commuter-motorcycle engines with the Hero Genuine Piston, part number 13101AAF00099S. This is the standard-size piston used in compatible Hero HF 100, HF Deluxe, HF Dawn, Splendor Plus, Splendor Pro, Splendor NXG, Splendor iSmart and Passion Pro engine applications.

The piston moves inside the cylinder bore and receives combustion force above its crown. It transfers this force through the piston pin and connecting rod to the crankshaft. Its ring grooves support the piston rings responsible for combustion sealing, oil control and heat transfer.

A worn, scored, cracked, seized, overheated or dimensionally damaged piston can contribute to low compression, piston slap, excessive engine-oil consumption, blue exhaust smoke, loss of power, abnormal engine noise or complete engine failure. The piston must never be replaced without measuring the cylinder bore and inspecting the rings, piston pin, connecting rod and lubrication system.

This product is one standard-size bare piston only. It is not a complete piston kit. The piston ring set, piston pin, piston-pin clips, cylinder block, connecting rod, crankshaft and gaskets are separately catalogued.

What This Product Is

• Hero Genuine standard-size engine piston
• Official description: Piston
• Hero retail part number: 13101AAF00099S
• Catalogue-format part number: 13101-AAF-00099
• Common buyer names: standard piston, engine piston, piston STD and bare piston
• Engine location: cylinder bore and crankshaft/connecting-rod assembly
• Size specification: standard / STD
• Catalogue quantity: one piston per compatible engine
• Supply form: one manufacturer-packed bare piston

Key Features

• Genuine Hero internal-engine component
• Standard-size specification for compatible original-bore applications
• Designed for the matching AAF-series piston ring, pin and cylinder arrangement
• Transfers combustion force through the piston pin and connecting rod
• Machined ring grooves for the specified matching piston ring set
• Suitable replacement when the original matching piston is worn, damaged or outside service limits
• Exact OEM part-number matching reduces standard-versus-oversize ordering errors
• Better fitment confidence than choosing a piston only by visual appearance
• One bare standard piston supplied
• Current Hero MRP reference: ₹410 inclusive of taxes

Confirmed Compatibility

Exact Model and Catalogue References

• Hero Splendor iSmart (May, 2014)
• Hero Splendor Pro FE (Aug, 2014)
• Hero Splendor Pro Classic (Sep, 2014)
• Hero HF Deluxe Black (Sep, 2014)
• Hero HF Deluxe (Apr, 2015)
• Hero HF Deluxe Eco (May, 2015)
• Hero HF Deluxe Black (May, 2015)
• Hero Passion Pro (Jun, 2015)
• Hero Splendor Pro (Oct, 2015)
• Hero Splendor Plus (Mar, 2015)
• Hero Splendor Plus (Dec, 2015)
• Hero HF Deluxe i3S (Jan, 2020)
• Hero HF Deluxe (Dec, 2022)

Official Hero Model-Family Applicability

• Hero HF 100 — only engine generations catalogued with 13101AAF00099S
• Hero HF Deluxe — compatible generations using 13101-AAF-00099
• Hero HF Dawn — only exact engine applications listing this piston
• Hero Splendor Plus — compatible engine generations using this SKU
• Hero Splendor Pro — compatible engine generations using this SKU
• Hero Splendor NXG — only exact engine applications listing this piston
• Hero Passion Pro — compatible engine generations using this piston
• Hero Splendor iSmart — confirmed May 2014 application

Compatibility Boundary

Hero has used multiple piston, cylinder, crankshaft and connecting-rod families across motorcycles sharing similar model names. The model name alone is not sufficient to confirm fitment.

No automatic compatibility is claimed for:

• Every HF 100, HF Deluxe or HF Dawn generation
• Every Splendor, Splendor Plus, Splendor Pro or Splendor iSmart generation
• Every Passion Pro generation
• Hero Super Splendor, Passion XPro or Glamour without an exact catalogue match
• Any engine that has been rebored or fitted with an oversize piston
• Any engine whose catalogue specifies another 13101-series piston

Fitment Note / Return Prevention Note

Before ordering, match the complete Hero part number 13101AAF00099S or catalogue number 13101-AAF-00099 with the motorcycle’s chassis/VIN-based crankshaft-and-piston catalogue.

Confirm all of the following:

• Exact motorcycle model, variant and production generation
• Engine family and crankshaft assembly
• Standard-size piston requirement
• Existing piston part number or repair-size marking
• Cylinder-bore diameter and service limit
• Cylinder taper, ovality and scoring
• Piston-to-cylinder clearance
• Piston-ring groove condition
• Piston-pin bore condition
• Connecting-rod small-end condition
• Whether the engine has previously been rebored, sleeved or repaired

Standard Size Only

This SKU is the standard-size piston. Do not install it in a cylinder that has been rebored to an oversize repair dimension.

The same engine family catalogues the following repair-size pistons separately:

• 13102-AAF-00099 — piston oversize 0.25 mm
• 13103-AAF-00099 — piston oversize 0.50 mm
• 13104-AAF-00099 — piston oversize 0.75 mm
• 13105-AAF-00099 — piston oversize 1.00 mm

The piston and piston ring set must use the same repair size. Select the repair size only after controlled cylinder measurement and machining assessment.

Matching Piston Ring Sets

• 13011-AAF-00099 — standard piston ring set
• 13012-AAF-00099 — ring set oversize 0.25 mm
• 13013-AAF-00099 — ring set oversize 0.50 mm
• 13014-AAF-00099 — ring set oversize 0.75 mm
• 13015-AAF-00099 — ring set oversize 1.00 mm

Separately Catalogued Related Parts

• 13111-087-000 — piston pin
• 13115-001-000 — piston-pin clip, catalogue quantity two
• Matching piston ring set
• Cylinder block
• Connecting rod and small-end components
• Crankshaft and connecting-rod bearings
• Cylinder-head and cylinder-base gaskets

Do not assume the piston pin, clips or rings are included with this bare piston merely because complete piston kits are available for other Hero engines.

Diagnosis Before Replacement

Low compression, blue smoke, oil consumption or engine noise can also be caused by:

• Worn, tapered, oval or scored cylinder bore
• Worn or broken piston rings
• Incorrect ring end gap or ring orientation
• Worn piston pin or connecting-rod small end
• Valve, valve-seat or valve-guide leakage
• Valve-stem seal failure
• Cylinder-head gasket leakage
• Restricted lubrication or incorrect engine oil
• Overheating, detonation or incorrect ignition/fuelling

Replacing only the piston will not repair an unserviceable cylinder, damaged connecting rod, worn crankshaft or leaking cylinder head.

Internal-engine return protection: Confirm the exact SKU and standard-size requirement before opening or installation. A piston showing ring installation, piston-pin marks, circlip marks, carbon, oil, scratches, measuring/tool marks, filing, machining, heat exposure or operational use cannot be treated as an unused return.

What You Will Receive

• 1 × Hero Genuine standard-size piston
• Part number: 13101AAF00099S
• One manufacturer-packed bare piston

Not included:

• Piston ring set
• Piston pin
• Piston-pin clips
• Cylinder block
• Connecting rod
• Crankshaft assembly
• Connecting-rod bearings
• Timing sprocket or Woodruff key
• Cylinder-head gasket
• Cylinder-base gasket
• Engine oil
• Cylinder honing, boring or machining
• Installation labour

Technical Details

Installation Note

Piston replacement requires complete internal-engine dismantling, precision measurement and correct component orientation. Installation should be performed by a trained motorcycle engine technician.

Before Installation

• Confirm the old and new piston part numbers
• Confirm that the engine requires the standard-size piston
• Measure the cylinder bore at the prescribed heights and directions
• Check bore wear, taper, ovality and scoring
• Measure the replacement piston at the specified measuring point
• Calculate piston-to-cylinder clearance
• Inspect and measure the piston ring grooves
• Check the matching ring set and ring end gaps
• Inspect the piston pin and connecting-rod small end
• Check crankshaft and connecting-rod condition
• Identify the piston’s correct installation direction and markings

During Installation

• Use only the matching standard-size ring set
• Install rings in the correct grooves and orientation
• Do not force, hammer or drop the piston
• Lubricate the piston, pin, rings and cylinder with clean specified engine oil
• Fit the piston in the correct direction
• Use a serviceable or new model-correct piston pin where required
• Install new piston-pin clips according to the service procedure
• Confirm each clip is fully seated and correctly oriented
• Use a proper ring compressor when inserting the piston into the cylinder
• Replace disturbed gaskets and seals
• Follow all model-specific tightening sequences and torque values

After Installation

• Rotate the engine manually before starting
• Refill with the specified engine oil
• Confirm adequate lubrication
• Check engine compression
• Listen for piston slap, knocking or abnormal mechanical noise
• Check for blue smoke and oil leakage
• Monitor engine temperature
• Follow the technician’s recommended running-in procedure

Buyer-Focused FAQs

1. What is Hero part number 13101AAF00099S?
It is a Hero Genuine standard-size bare piston for compatible HF 100, HF Deluxe, HF Dawn, Splendor and Passion Pro engine applications.

2. Is this a standard or oversize piston?
This is the standard-size or STD piston.

3. Is this a complete piston kit?
No. This listing is for one bare piston only.

4. Are the piston rings included?
No. The matching standard ring set is separately catalogued as 13011-AAF-00099.

5. Is the piston pin included?
No. The compatible piston pin is separately catalogued as 13111-087-000.

6. Are piston-pin clips included?
No. Two clips are separately catalogued under 13115-001-000.

7. Does it fit Hero HF 100?
Hero officially lists the HF 100 family. Confirm the exact engine and chassis/VIN catalogue before ordering.

8. Does it fit Hero HF Deluxe?
Yes. Confirmed applications include several 2014–2015 generations, HF Deluxe i3S January 2020 and HF Deluxe December 2022.

9. Does it fit Hero HF Deluxe Eco?
Yes. HF Deluxe Eco May 2015 is an exact confirmed application.

10. Does it fit Hero HF Dawn?
Hero officially lists the HF Dawn family. Match the exact engine catalogue because HF generations can use different pistons.

11. Does it fit Hero Splendor Plus?
Yes. Confirmed references include Splendor Plus March 2015 and December 2015. Other generations require an exact catalogue match.

12. Does it fit Hero Splendor Pro?
Yes. Confirmed references include Splendor Pro FE August 2014, Splendor Pro Classic September 2014 and Splendor Pro October 2015.

13. Does it fit Hero Splendor NXG?
Hero officially lists the Splendor NXG family. Confirm the exact engine catalogue before ordering.

14. Does it fit Hero Splendor iSmart?
Yes. Splendor iSmart May 2014 is an exact confirmed application.

15. Does it fit Hero Passion Pro?
Yes. Passion Pro June 2015 is an exact confirmed application. Other generations must be checked by part number.

16. Does it fit Hero Super Splendor or Passion XPro?
No automatic compatibility is claimed. These models can use different piston and crankshaft families.

17. Can this piston be used after cylinder reboring?
Only if measurement confirms that the bore remains standard size. Rebored cylinders generally require the corresponding oversize piston and matching oversize rings.

18. What oversize pistons are available in this family?
The catalogue lists 0.25, 0.50, 0.75 and 1.00 mm oversize piston references separately.

19. Can I use standard rings on an oversize piston?
No. The piston and ring set must have the same repair-size specification.

20. Will a new piston stop blue smoke?
Only when piston wear is the confirmed cause and the cylinder, rings, valves and guides are serviceable or repaired correctly.

21. Will it restore compression?
It can help when piston or ring-groove wear is the cause, but the cylinder, rings and cylinder head must also be within specification.

22. Can the piston be fitted without measuring the cylinder?
No. Bore size, taper, ovality and piston-to-cylinder clearance must be measured.

23. Does the piston have an installation direction?
Yes. Follow all crown markings and the model-specific service procedure to establish the correct direction.

24. Should new piston-pin clips be used?
Use new model-correct clips where required by the service procedure. Incorrectly seated clips can cause severe cylinder damage.

25. Is professional installation necessary?
Yes. Incorrect piston size, clearance, direction, ring installation or clip seating can cause engine seizure or catastrophic damage.

26. How can I prevent ordering the wrong piston?
Match the complete SKU, exact engine generation, repair size, original piston marking, bore measurements and chassis/VIN-based Hero catalogue.

Internal Engine Component Purchase Warning

Confirm the exact standard-size piston before opening or installation. Do not fit it merely for trial. Ring marks, piston-pin marks, circlip marks, scratches, measuring marks, oil exposure, filing, machining, heat damage or operational use can permanently affect the piston and invalidate return eligibility.