Redcat Racing – How to Tune Up Your Redcat Racing Nitro Engine

Here’s a simple and quick guide on what you need to know about your Redcat Racing nitro engine and how you can tune it. Before we dig in and talk about tuning the engine, let us first know some basic information about Redcat nitro engine.

There are actually a lot of available sizes for your RC engines like the SH18, SH21 and so on. For this tuning guide, we will use two different types of engine that is most commonly used by RC users. There are 2 different kinds of carburetor a slide carburetor and rotary.

This is a Redcat Racing .18 3.0 cc 2 Stroke Nitro Engine with Rotary Carb.

This is a Redcat Racing SH .21 3.5cc 2 Stroke Nitro Engine with Slide Carburetor.

For a rotary carburetor, you will find a bronze part of the carburetor and this is known as the HSN or the high speed needle which is responsible for controlling the fuel mixture and the air during partial or full throttle, another part of a rotary carburetor is the LSN or the low speed needle. You can find this part in the middle section of the carburetor. It functions as a controller in the air and fuel mixture during idle or partial throttle. The Idle Speed Screw makes the carburetor opening gap to close or open. It is recommended to set your opening gap at a 1 mm size to let your racing car start on idle. It controls the amount of air that gets mixed with the fuel affecting the idle speed to either an increase or a decrease.

For a slide carburetor, the same with rotary carburetor, it also has a HSN that controls air and fuel during partial and full throttle. The LSN in a slide carburetor that controls fuel and air mixture during an idle or to partial throttle is located at the center of the throttle arm. An Idle Speed Screw controls the air that mix with the fuel in the idle speed.

For a slide carburetor, the same with rotary carburetor, it also has a HSN that controls air and fuel during partial and full throttle. The LSN in a slide carburetor that controls fuel and air mixture during an idle or to partial throttle is located at the center of the throttle arm. An Idle Speed Screw controls the air that mix with the fuel in the idle speed.

Make sure to check out part 2 of How to Tune Up Your Redcat Racing Nitro Engine

For Redcat Racing Parts and Hop Ups see our online store at DaftGadgets.com

For more information on Redcat Racing Nitro Vehicle Set Up See Articles:

Setting Up Your Nitro Redcat Racing Vehicle

Redcat Racing Nitro Basics

How To Use a Redcat DSM Radio

How To Tune Up Your Redcat Nitro Engine

How To Tune Up Your Redcat Nitro Engine Part II