Product Description

SHIMANO 105GY IDLE GEAR B (BNT1648)

Restore Your Calcutta's Level Wind

The Shimano 105GY Idle Gear B (Part No. BNT1648) is a genuine OEM white plastic gear designed for the level wind drive train of the Shimano Calcutta B and TE series. This specific gear serves as the intermediate link (idler) that transfers power from the main drive gear to the worm shaft gear, ensuring the line guide moves in sync with the spool.

Unlike the Idle Gear for the Curado (BNT1301), this gear is specifically profiled for the round-profile Calcutta frame. If your Calcutta's level wind has stopped traversing or makes a "ticking" noise, stripped teeth on this plastic gear are the most common cause. It acts as a safety fuse, stripping out to protect the more expensive metal worm shaft and drive gears if the line guide gets jammed.

Product Specifications

• Part Name: Idle Gear (B)

• Manufacturer: Shimano

• Part Number (MPN): BNT1648

• Schematic Code: 105GY

• Material: White Nylon / Plastic

• Installation Position: Non-Handle Side (Under the Side Plate, connecting to the Worm Shaft)

Compatible Models

This part is engineered for the popular "B" generation of the Calcutta round reels.

• Shimano Calcutta B Series:

  • CT 400 B (Check specific schematic, some larger sizes vary)

Installation & Reference

To ensure this is the correct gear for your reel, please cross-reference the part number BNT1648 or the schematic code 105GY with your reel's service diagram.

• Schematic Diagrams: For detailed PDF schematics and part location verification, please visit www.reelschematic.com.

• Alternate Part Number: BNT1648

Installation Tip: This gear often sits on a post and is secured by an E-Clip (Part BNT0032) and potentially a washer. Crucial: Inspect the Worm Shaft Gear (the gear this idle gear touches) for any debris or damage. If the metal worm shaft gear has a burr, it will strip your new plastic idle gear instantly.