YAMAHA Yamalube Yamabond 4 silicone liquid gasket — 2.5 oz tube, OEM oil- and heat-resistant sealant

YAMAHA Yamalube Yamabond 4 is an OEM silicone-based liquid gasket sold in a 2.5 oz tube that cures to a flexible, oil- and heat-resistant seal for Yamaha engines and components.

Engineered by Yamaha for Yamaha motorcycles, ATVs, and other powersports machines, this factory-original Yamabond 4 liquid gasket replaces traditional gaskets and fills mating surfaces where a reliable seal is needed. The single 2.5-ounce tube is formulated to set quickly and form a durable, rubber-like bead that tolerates engine oil and gear lubricants once cured. Use it where the service manual specifies Threebond 1215 or equivalent and follow torque and cure-time guidelines for best performance.

How quickly does Yamabond 4 set and when is it safe to reassemble?

This silicone gasket compound begins to skin over rapidly and typically sets to a rubbery seal within about 60 minutes, depending on temperature and humidity. Full cure strength develops over additional hours; allow adequate time before pressurizing or refilling with oil to ensure a complete seal.

• Typical skin-over: ~60 minutes at room temperature
• Partial cure: several hours; full cure: up to 24 hours depending on conditions
• Follow Yamaha service manual cure and torque recommendations

Which applications on my Yamaha should use this OEM liquid gasket?

Yamabond 4 is intended for sealing engine covers, timing covers, water pump housings, and other mating surfaces where a silicone sealant specified by the manufacturer is required. It’s formulated to match Yamaha’s factory standards and is recommended wherever Threebond 1215 is referenced in service procedures.

• Use on engine and gearbox mating surfaces per manual guidance
• Suitable for oil-exposed joints and high-temperature locations
• Replace paper gaskets or supplement where manual permits silicone gaskets

What are the material properties and resistance characteristics?

This product cures to a flexible, rubber-like material that resists heat, engine oil, and gear lubricants, maintaining a long-lasting seal under vibratory and thermal stress. As a Yamaha-manufactured formula, it's matched to the OEM specifications used across Yamaha service parts.

• Silicone-based chemistry for flexibility and temperature resistance
• Resists engine oil and gear lubricant contact after curing
• Forms a reusable, pliant gasket that compensates for surface irregularities

How should I apply Yamabond 4 for consistent results?

Prepare mating surfaces by cleaning thoroughly and removing old sealant or debris. Apply a continuous bead to one side only, assemble within the recommended working time, and torque fasteners in the specified pattern to avoid excess squeeze-out.

• Clean and dry surfaces; remove old gasket material
• Apply continuous bead and avoid excessive thickness
• Assemble and torque per Yamaha specifications; remove excess cured bead if needed

Who is this product for? Mechanics, home DIYers, and professional technicians who service Yamaha motorcycles, ATVs, snowmobiles, and marine engines will benefit from this factory-original liquid gasket. Choose the Yamalube Yamabond 4 2.5 oz tube when the service manual calls for a Threebond 1215 equivalent or when you want an OEM-quality silicone sealant engineered specifically for Yamaha machines.