Hero Genuine 91001GF6000S 6304 Crankshaft Main Bearing 20x52x15 – Splendor, HF, Passion, Xpulse & Xtreme

Hero Genuine 91001GF6000S – 6304 Crankshaft / Engine Main Bearing

Hero 91001GF6000S is a genuine 6304 radial ball bearing used in the crankshaft / engine assembly of a wide range of Hero motorcycles. Buyers and mechanics commonly search this part as a 6304 main bearing, crank bearing, crankshaft bearing, engine bearing or side bearing.

Hero MotoCorp's current e-shop identifies the exact part number 91001GF6000S as “Radial Ball Bearing 6304” and lists it for models including HF Deluxe, HF Dawn, HF 100, Splendor Plus, Splendor Pro, Splendor NXG, Splendor iSmart, Passion Pro, Passion XPro, Xtreme 160, Xtreme 200, Xpulse 200 and Xpulse 200T.

Quick Product Details

Dimension note: The 20 × 52 × 15 mm size is the standard boundary dimension for a 6304 deep-groove ball bearing. Hero identifies this part as 6304, but the safest replacement method is still to match Hero part number + bearing designation + motorcycle application, not dimensions alone.

What Is 91001GF6000S Used For?

This bearing supports rotating crankshaft / engine components while helping maintain alignment and reduce friction. In older Hero engine parts catalogues, the base number 91001-GF6-000 appears directly inside the Crank Shaft / Piston assembly as “Bearing, Radial Ball, 6304.”

That is why mechanics commonly ask for this part as:

• Hero main bearing 6304
• Splendor crank bearing
• HF Deluxe engine main bearing
• Passion crankshaft bearing
• 6304 engine bearing
• Hero crank side bearing
• 91001GF6000S bearing

Official Current Hero Fitment

Legacy / Older Applications Also Verified

Current specialist Hero parts references also list the same exact part number for several older models / generations, including:

• Passion Plus
• HF Dawn / formerly CD Dawn
• HF Deluxe / formerly CD Deluxe
• 100 SS / formerly CD100 SS
• Older Splendor Plus, Splendor NXG, Splendor Pro and Passion Pro generations

Because Hero reused this 6304 bearing across many engines and years, always confirm the exact engine parts diagram if your bike has had an engine swap or major internal rebuild.

Xpulse / Xtreme Buyers – Important Generation Check

Hero's current e-shop explicitly includes Xpulse 200, Xpulse 200T, Xtreme 160 and Xtreme 200 in the fitment list for 91001GF6000S. Specialist catalogue indexing also shows the 6304 bearing across multiple Xpulse/Xtreme catalogue families.

However, newer model names can cover multiple engine revisions such as 2V, 4V, BS6 and OBD generations. If your exact catalogue calls for a different bearing number on one side of the crankshaft, follow the parts catalogue rather than assuming both engine bearings are identical.

6304 Bearing Size – 20 × 52 × 15 mm

The 6304 bearing designation uses the standard boundary dimensions:

• Inner Diameter (ID): 20 mm
• Outer Diameter (OD): 52 mm
• Width: 15 mm

These dimensions are useful when cross-checking the removed bearing, but do not buy a random industrial 6304 only because the dimensions match. Engine applications can depend on bearing construction, clearance and specification. For a genuine replacement, match the Hero part number 91001GF6000S.

How Many Bearings Does My Engine Need?

This product is sold as 1 piece.

The quantity installed in the engine is model-dependent. Hero's Splendor NXG crankshaft/piston catalogue, for example, lists:

91001-GF6-000 – Bearing, Radial Ball, 6304 – Quantity 2

That does not mean every Hero engine uses two identical 6304 bearings. Some engine families use different bearing types on opposite sides. Check the exact parts diagram before deciding quantity.

When Is a Crankshaft Main Bearing Replaced?

Replacement is generally considered during engine overhaul when a technician identifies bearing wear or damage. Possible symptoms that require investigation can include:

• Abnormal rumbling or rough bearing noise from the engine
• Excessive crankshaft play detected during dismantling
• Roughness when the bearing is rotated by hand after removal
• Engine seizure / internal damage
• Metal contamination following engine failure
• Crankshaft replacement or complete bottom-end rebuild
• Visible pitting, scoring, corrosion or damaged bearing races

These symptoms are not sufficient to diagnose the bearing by themselves. Engine noise can come from many components, so internal diagnosis should be performed before ordering.

Why Replace With the Exact Hero Part Number?

Crankshaft bearings are precision engine components. Correct fit, internal specification and installation are more important than simply finding a bearing that looks similar.

Using Hero Genuine 91001GF6000S gives the mechanic the specified Hero replacement reference for supported applications rather than relying on an unidentified generic bearing.

What You Will Receive

1 × Hero Genuine 91001GF6000S Bearing, Radial Ball, 6304

Only one bearing is supplied per ordered quantity. Crankshaft, connecting rod, oil seals, gaskets, other engine bearings and installation consumables are not included.

Installation / Workshop Note

This is an internal engine bearing. Professional installation is strongly recommended.

• Split / dismantle the engine according to the service procedure.
• Confirm the removed bearing number and position.
• Inspect crankshaft journals, crankcases and related components for damage.
• Use appropriate bearing removal and installation tools.
• Do not transmit installation force through the balls when pressing a bearing into place.
• Maintain correct cleanliness during engine assembly.
• Replace required gaskets, seals and locking components during reassembly.
• Follow the model-specific Hero workshop torque and assembly specifications.

Fitment / Return Prevention

Before ordering, confirm:

• Hero Part Number: 91001GF6000S
• Catalogue/Base Number: 91001-GF6-000 where applicable
• Bearing designation: 6304
• The exact position in your engine
• The quantity required for your specific model

If your engine has already been opened, the best check is to compare the marking on the old bearing and the Hero parts catalogue before purchase.

Buyer-Focused FAQs

What is Hero 91001GF6000S?
It is a genuine Hero 6304 radial ball bearing used in the engine / crankshaft assembly of multiple Hero motorcycles.

Is 91001GF6000S a crankshaft bearing?
Yes. Hero parts-catalogue data places the base number 91001-GF6-000 in the crankshaft/piston assembly, where it is described as Bearing, Radial Ball, 6304.

Is it called a main bearing?
Yes. Mechanics commonly call this type of crank-support bearing a crankshaft main bearing / engine main bearing / crank bearing.

What size is a 6304 bearing?
The standard 6304 boundary dimension is 20 mm inner diameter × 52 mm outer diameter × 15 mm width.

Does it fit Splendor Plus?
Yes. Hero MotoCorp's current e-shop lists Splendor Plus among the applications for 91001GF6000S.

Does it fit Splendor NXG?
Yes. Hero lists Splendor NXG, and a Hero Splendor NXG parts catalogue explicitly shows 91001-GF6-000 / 6304 in the crankshaft assembly.

Does it fit HF Deluxe?
Yes. HF Deluxe is explicitly listed by Hero MotoCorp.

Does it fit HF 100?
Yes. Hero's current listing explicitly includes HF 100.

Does it fit Passion Pro?
Yes. Passion Pro is listed by Hero MotoCorp.

Does it fit Passion Plus?
Current specialist Hero parts references list the exact 91001GF6000S for older Passion Plus applications.

Does it fit CD100 SS?
Specialist Hero parts data lists the part for 100 SS, formerly CD100 SS. Confirm the exact engine if it has been modified or replaced.

Does it fit Xpulse 200?
Yes. Hero MotoCorp's current e-shop lists Xpulse 200 for 91001GF6000S.

Does it fit Xpulse 200T?
Yes. Hero's current application list includes Xpulse 200T.

Does it fit Xtreme 200?
Yes. Hero lists Xtreme 200, and parts-catalogue evidence for the 200 cc engine family also identifies a 6304 radial ball bearing in the crankshaft assembly.

How many bearings are included?
1 piece.

Do I need two?
Possibly, depending on the engine. For example, the Splendor NXG catalogue uses two 6304 bearings in the crankshaft assembly. Other engines may use a different bearing on the opposite side, so check your exact parts diagram.

Can I replace it with any 6304 industrial bearing?
Do not choose only by dimensions. Match the exact engine requirement and Hero part number. Bearing clearance / construction can matter in engine applications.

What is the current Hero MRP?
Hero MotoCorp's current official e-shop lists ₹200 inclusive of taxes.