Atesilor Oil Pump Block Off Kit for Yamaha PW50/PW80/Y-Zinger — Pre‑Mix Conversion with O‑Ring & Port Caps

Atesilor's Oil Pump Block Off Kit converts Yamaha PW50, PW80 and Y-Zinger two-stroke models to reliable pre-mix operation by replacing the stock oil injection system with a precision-machined block-off plug and complete mounting hardware.

This kit is engineered to make the switch from oil-injected to pre-mixed fuel straightforward and durable. It includes a CNC-style block off plug, plug cover, O-ring, two bolts and two port caps sized for Yamaha PW50 (all years), PW80 (all years) and Y-Zinger models produced between 1983–2014. The components are made to fit the factory opening precisely, sealing off the oil pump passages and providing a neat, solid replacement that reduces the chance of oil-pump related failures.

How does this kit change lubrication on my two-stroke Yamaha?

Installing the block off plug disables the bike's automatic oil injection so you mix oil directly with gasoline at the tank. That shifts control of the oil-to-fuel ratio to the rider and removes the oil pump and its drive components from service.

• Converts to manual pre-mix lubrication for consistent oil ratio control.
• Blocks oil pump inlet/outlet ports with precision port caps.
• Includes an O-ring to ensure a leak-free seal at the block-off site.

Is installation difficult and what hardware is included?

Installation is designed to be straightforward for anyone comfortable with basic bike maintenance. The kit supplies the key parts required to replace the stock oil pump without fabricating parts or modifying the crankcase.

• Comes with two mounting bolts sized to the factory threads for a secure fit.
• Plug cover and port caps conceal and seal the original oil passages.
• O-ring included to prevent oil or fuel leakage where the block plugs into the case.

Will converting to pre-mix affect performance or reliability?

Many riders choose pre-mix for more consistent oil-to-fuel ratios and to eliminate the risk of oil-pump failure. The kit itself does not change engine internals, but can improve reliability by removing a common failure point when installed correctly.

• Removes oil injection system failure modes (pump seals, drive wear).
• Allows riders to fine-tune oil ratios based on riding style and conditions.
• Precision fit reduces chance of leaks and mechanical interference with other components.

What should I know about maintenance after conversion?

After converting, routine checks focus on mixing the correct oil ratio and confirming the block-off remains sealed. The hardware provided is durable, but periodic inspection keeps the seal and mounts in good condition.

• Check O-ring and bolts for tightness after initial run-in and at regular service intervals.
• Use the manufacturer's recommended two-stroke oil and correct mix ratios for your engine.
• Inspect port caps and plug cover for signs of leaks or loosening.

Who is this kit for? This Atesilor Oil Pump Block Off Kit is aimed at riders and mechanics who own Yamaha PW50, PW80 or Y-Zinger models and prefer the control and simplicity of pre-mixing fuel. It's a practical choice for restorations, performance-minded riders who want precise oil ratios, or anyone seeking to retire an oil-injection system that has become unreliable. If you want a clean, OEM-compatible conversion without modifying the crankcase or fabricating parts, this kit supplies the essential components to do the job cleanly and reliably.