O.S. Engine OS27981910 Carburettor Needle Set 20M,40E,60B,60G,60H,60L  [OS27981910]

O.S. ENGINES NEEDLE 20M,40E,60B,60G,60H,60L
Price:
CAD$10.39
Brand:
O.S. Engine
Model:
OS27981910
GTIN:
4531028117464
Condition:
Brand New
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Replacement needles for RC carburettors

This listing covers the O.S. Engine OS27981910 needle codes 20M, 40E, 60B, 60G, 60H and 60L as direct replacement needles for carburettor needle valves used on RC glow engines. The code labels identify the needle profiles used during maintenance and overhaul.

Fitment is a standard carburettor service procedure: remove the carburettor top, extract the existing needle assembly, check the seat and needle tip for wear or contamination, and install the matching code from the set. Reassemble and inspect the carburettor for leaks before running.

After installation perform staged tuning on the bench before running at speed. Small changes to needle profile will alter idle, midrange and throttle response; make conservative adjustments, monitor engine temperature, and fine tune the mixture and idle screw for consistent running.

How do I pick the correct needle code from the set?

Compare the code stamped on your original needle or consult your engine service manual, visually check the tip shape, and choose the replacement with the identical code to maintain the original fuel curve.

Any advice for tuning after a needle swap?

Start with baseline settings for idle and mixture, run short controlled tests to observe throttle response and temperature, then adjust in small increments to avoid lean conditions and ensure stable operation.

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