Cometic Twin Cam Inspection/Derby Cover Gasket - BIG Twin EA 1/PK Oe#25416-99c — Harley-Davidson (1999-2017)

Cometic Twin Cam inspection/derby cover gasket for Big Twin V-twin engines, a direct replacement for OE# 25416-99C. Single-pack gasket designed to seal the inspection cover or derby cover on Twin Cam-equipped Harley-Davidson and Indian Motorcycle models.

Features

• Direct OEM replacement (OE# 25416-99C)
• Sized 8.5 in x 8 in x 0.25 in
• Lightweight at 0.02 lbs
• Cometic gasket technology for V-twin engines

Specifications

• Brand: Cometic
• Manufacturer Part #: C9997F1
• OE Reference: 25416-99C
• Length: 8.5 in
• Width: 8 in
• Height: 0.25 in
• Weight: 0.02 lbs
• Quantity: 1 per pack

Fitment

Fits Big Twin V-twin motorcycles with Twin Cam engines, including Harley-Davidson and Indian Motorcycle models that use OE# 25416-99C.

Frequently Asked Questions

What does this gasket seal?

The inspection cover or derby cover on Twin Cam Big Twin engines. Prevents oil weeping at the cover joint.

Will this fit my model year?

This is a direct replacement for OE# 25416-99C. Check your bike's OEM gasket part number to confirm compatibility.

Is installation difficult?

No — unbolt the cover, remove the old gasket, clean the surface, and install the new Cometic gasket with the bolts torqued to OEM spec.

Do I need gasket sealant with this?

Cometic gaskets are designed to seal without additional sealant when torqued properly. Do not use RTV or other compounds unless the OEM manual specifies it.