XCell Spectra-G Model – Additional Operators Guide
Page 7 of 16
Copyright
12/5/2004
Miniature Aircraft USA
c) In addition, GoPed manufacturers offer a number of mufflers for use with the G231
on scooters. Some of these have been tested and work acceptably. Most of these are
quite a bit heavier than either the stock muffler or the Hatori.
3.3. Air Filter
It is recommended that an air cleaner always be used with an installed Zenoah engine. At full
operating RPM, the engine is using a lot of air and is more prone to pick up contaminants
from the air. This will affect the long-term health of your new motor.
3.4. Spark Plugs
MA recommends using the standard spark plugs that are shipped with the Zenoah motors.
These have proven to run very well. Replacement plugs of this type are available from
various sources.
Regardless of the manufacturer, a resistor spark plug (R designation) MUST BE USED WITH
THIS HELICOPTER. Failure to use a resistor plug will result in loss of control of the model
due to RF interference from the ignition system.
Although not required, it is recommended that you purchase the RF Reduction Kit - MA Part
# 125-114. This will eliminate any potential ignition noise.
3.5. Initial Carburetor Setup – Zenoah G231
As an initial setup, use these settings depending upon the carburetor type. The Walbro
carburetors have the model number stamped on the carburetor body near the fuel inlet.
These settings are based on average altitude above sea level. High altitude operation will
require different settings. They apply to the stock motor only. If you are using the optional
high performance motor, follow the instructions included with the motor
The adjustment of either the high speed or low speed needles works as follows:
Leaner Mixture – close needle – turn clockwise
Richer Mixture – open needle – turn counter-clockwise
Note:
There has been a lot written about which carburetor to use with the Zenoah G231
motor. Depending on where you acquire it, it may use the Walbro WT677 or WT643
carburetor. We have provided settings for both carburetors however MA recommends the use
of the WT643 carburetor for best results.
3.5.1. Walbro WT-677
Low Speed:
1-2/3 turns open from full closed
High Speed:
1-1/8 turns open from full closed
3.5.2. Walbro WT-643
Low Speed:
1-1/2 turns open from full closed
High Speed:
1-1/2 turns open from full closed
