60B Carburettor Seal OS27915100 Compatible with RC Nitro Carburettors by O.S. Engine  [OS27915100]

Tuning and Durability Notes

The O.S. Engine OS27915100 sealing washer is a service replacement sized for RC nitro carburettors. It helps form a reliable seal between carburettor parts to minimize fuel and air leaks that can upset mixture and throttle transition.

Installation follows normal carburettor service steps: access the needle area or cover, fit the OS27915100 washer with correct orientation and seating, then reassemble and test for any leakage. Work cleanly and use basic hand tools to protect carburettor bores from contamination.

For tuning work the washer supports repeatable needle settings and can make tuning changes behave more predictably. Renewing aged seals often reduces the need to re-tune after running sessions, improving session-to-session consistency.