RcTek : Information & Resources for the Model Car Racer

Largescale Radio Controlled Model Car Engine Fuel/Air Mixture Settings

To assist the large scale radio controlled model car racer in setting the air/fuel mixtures on their engines, we have the below information. The carburettor depicted here is the one from the Komatsu Zenoah G230RC engine, but carburettors from the other engine manufacturers share similar, if not the same, layout.

These settings may also be of use to such as GoPed riders or anyone who uses these 22/23cc two stroke engines, but as different pipes and filter set-ups are used they will need separate consideration.

Note: This article was written in 2001 and therefore needs updating to include the latest engines.

The Carburettor Adjusters

Komatsu Zenoah G230RC Engine carburettor settings

The carburettor has three basic controls which are shown in the image.

1. H Needle: This screw controls the high speed mixture settings. Some carburettors have a T-bar to ease the adjusting process. (Top End Speed)

2. L Needle: This screw controls the low speed mixture. (Bottom End Speed)

3. Idle Screw: This screw, not surprisingly, controls the idle (tick over) speed of the engine.

Base Settings for Various Engines

The below is provided for guidance only and we do not accept any responsibility for any damage you do to your engine.

Settings are based upon the screws being turned fully in (not tightly).

Please Note: that these are base settings and you need to take into consideration climate and weather differences, as well as any tuning or tuned parts that have been fitted to the engine.

Komatsu Zenoah G230RC

H Needle: 1 & 3/8 +/- 1/4 turns out.

L Needle: 1 & 1/4 +/- 1/4 turns out.

Idle Screw:

Notes: This is the factory set standard for the climate in Japan using the standard muffler and air filter.

Komatsu Zenoah G2D

H Needle: 1 & 1/8 turns out.

L Needle: 1 & 1/4 turns out.

Idle Screw: Turn the idle screw all the way in to just fully compress the spring and then back 2.5 turns.

Notes: These settings were kindly provided by the former UK Zenoah importer Rob Lochier of Alro Racing Systems.

Solo Engine Part One

Solo Engine with Samba 2, FirstOne & Lauterbacher 4 Chamber Pipes

H Needle: 1 & 3/4 turns out.

L Needle: 1 & 1/4 turns out.

Idle Screw: Approximately 3 turns out.

Notes: These settings were provided by Ian Oddie of Oddified Motors.

Solo Engine Part Two

Solo Engine with Most Other Pipes

H Needle: 1 & 3/4 turns out.

L Needle: 1 turn out.

Idle Screw: Approximately 4 to 5 turns out.

Notes: These settings were provided by Ian Oddie of Oddified Motors.

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© 2001, 2009 by Darren Burnhill