OS27981910 Carburettor Needle Set for RC Glow Engines by O.S. Engine  [OS27981910]

O.S. ENGINES NEEDLE 20M,40E,60B,60G,60H,60L
Price:
£5.49
Brand:
O.S. Engine
Model:
OS27981910
GTIN:
4531028117464
Condition:
Brand New
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Needle replacements for glow engine carburettors

This listing details the O.S. Engine OS27981910 needle codes 20M, 40E, 60B, 60G, 60H and 60L as replacement needles for carburettor needle valves fitted to RC glow engines. The code system identifies needle shapes so technicians can restore original fuel delivery characteristics during servicing.

Fitting follows a standard maintenance routine: take off the carburettor top, remove the old needle assembly, inspect the seat and needle tip for wear or dirt, then fit the corresponding coded needle. Reassemble carefully and verify there are no leaks prior to test running.

Once fitted, carry out stepped tuning: bench verification then a brief track or range test. Needle selection impacts idle, midrange and full-throttle behavior; make measured adjustments, monitor engine temps, and refine idle and mixture to achieve smooth, repeatable running.

How can I ensure I choose the original needle profile?

Check the code stamped on your current needle or consult the engine manual, compare tip geometry, and select the matching code from this set to maintain the engine's intended mixture behaviour.

What is the best tuning sequence after changing needles?

Perform initial bench tuning to confirm baseline settings, then run a short practical test. Make small, methodical mixture and idle changes while observing temperature and throttle response to avoid unstable or lean operation.

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