Rubber Plug | CB350 NX250 NX650 | 50318-041-600

Complete your restoration with a high-performance solution for your frame and bodywork. The 50318-041-600 Rubber Plug (often referred to as the “Weless Hole” or “Useless Hole” plug) is a small but critical finishing piece used across decades of Honda motorcycles. From the iconic CB350 to the adventure-ready NX250 and NX650 Dominator, these plugs seal open holes in the frame and subframe to prevent moisture, dirt, and road salt from causing internal rust.

Over time, factory rubber plugs become brittle, shrink, and eventually fall out, leaving your bike’s “backbone” exposed. At R3print Moto, we provide a superior 3D printed replica made from TPU 90A, an industrial-grade engineering elastomer. Unlike standard rubber that cracks under UV exposure, TPU 90A maintains its flexibility and grip for life. It is fully oil-resistant, chemical-resistant, and specifically engineered for a precise, snug fit that won’t vibrate loose.

Whether you are plugging a hole in a CB350 side cover or sealing the frame on an NX650, these TPU 90A replicas offer a cleaner look and better protection than aging dealer stock. Available in sets of 2, 4, or 10 pieces.

Product Details
Make: Honda
Model – Years:
Honda C70 Super Cub – 1982
Honda CB350 K2 – 1970
Honda CB350 K3 – 1971
Honda CB350 K4 – 1972
Honda CB450 K5 – 1972
Honda CB450 K6 – 1973
Honda CB600F Hornet – 2008 to 2009
Honda CL350 – 1970 to 1974 (K2 to K5)
Honda FX650 Vigor – 1999
Honda GL1800 Goldwing – 2001 to 2005
Honda NX250 Dominator – 1988 to 1993
Honda NX500 Dominator – 1988 to 1999
Honda NX650 Dominator – 1988 to 1998
Honda ST1300 Pan-European – 2002 to 2009
Honda TRX400F – 2004 to 2005
Honda VT750  – 1983 to 2024
Honda VT1300 – 2010 to 2016
Honda VRF800F – 2014 to 2021
Honda XR70R – 1997 to 2003
Partnumber: 50318-041-600 | 50318041600 | 50318 041 600
Schematic: View original placement on the Honda CB350 – CMSNL Parts Diagram or Honda NX650 Dominator – CMSNL Parts Diagram.
Material: TPU 90A (Thermoplastic Polyurethane). This engineering elastomer provides rubber-like flexibility for airtight seals and vibration dampening. Tested to a 94°C Vicat Softening Point, it’s the engineering standard for oil-resistant motorcycle components that won’t crack like aged factory rubber.
Color: Black
Surface Finish: Lightly textured, similar to the original plastic parts.
Production Method: Additive Manufacturing (3D Printing), using FDM (Fused Deposition Modeling) technology.

Please note: This is a replacement part manufactured by R3print Moto, specifically engineered for compatibility with Honda classic motorcycles. It is an aftermarket component and not an original equipment manufacturer (OEM) part from Honda.

Customization
We understand every build is unique. If you are looking for a personalized touch or a specific modification to this rubber plug, we can design a custom solution just for you. Get in touch to discuss your project.

Shipping & Availability
This R3print Moto part is made-to-order to ensure the highest quality and a perfect finish. Please allow a production time of 2 – 5 business days.
Shipping times depend on your location and are typically between 3 – 7 business days for Europe and 8 – 15 for UK & North America. Rest of the world 15+ business days.
You will receive a tracking number as soon as your order has shipped.

Returns & Warranty
We stand behind our Re-engineered parts. All purchases from R3print Moto come with a Lifetime Guarantee.