User Manual Manual

Page 4

Hi-Speed Adjustment

After initial acceleration the engine should pull at a steady rate while maintaining a two-stroke whine and a notice-

able trail of smoke. If the engine labors and is sluggish with heavy smoke, the mixture is too rich and needs to be leaned

by turning the hi-speed needle clockwise in one hour increments until it runs smoothly. If the engine isn't smoking or

starts to die after starting to accelerated, it is too lean and you must richen the mixture by turning the needle counter-

clockwise. Don't be confused by the sound of the engine and the actual performance. A leaner mixture will produce a

higher pitch exhaust note but this does not necessarily mean improved performance as the engine is on the verge of

over heating and possible damage. Ideally you want to run the engine so that it is on the slightly rich side of optimum.

This will give you the best combination of speed and engine life. CAUTION: The engine is too lean and overheating if it

accelerates rapidly with a high pitch scream then seems to labor, stops smoking, or loses speed. This can be caused by the

terrain, atmospheric conditions, or drastic altitude changes. To avoid permanent engine damage, Immediately richen the

mixture by turning the hi-speed needle counter-clockwise at least "two hours" and be prepared for further adjustments

before running anymore.

About Glow Plugs

The glow plug is like the ignition system in your automobile. The coiled element in the

center of the plug glows red hot when connected to a 1.5-volt battery (located in the igniter).

This is what ignites the fuel/air mixture when compressed in the cyclinder. After the engine fires,

the heat generated by the burning fuel keeps the element hot. Common reasons for the engine

not starting is the 1.5 volt battery being weak or dead, the glow plug being wet with fuel, or the

element burned out. Use a spare glow plug to check the igniter. If the igniter makes the element

glow, remove the plug from the engine to check it in the same manner. A wet glow plug means there is excess fuel in

the engine. To eliminate this, put a rag over the head and turn the engine over a few seconds with your "Spin-Start".

Reinstall the glow plug making sure you have the brass gasket on it. The engine should now start.

Testing the Temperature

The ideal operating temperature for the engine will vary with the air temperature but in general it should be in the

200°F to 230°F (93.3°C to 110°C) range. A simple way to check the engine temperature is to put a few drops of water

on the top of the head/heatsink. It should take 3-5 seconds for the water to evaporate. If it boils away quickly the

engine is overheating and the Hi-Speed needle needs to be richened (turned counter-clockwise) at least "two hours".

If you plan on racing or prolonged hi-speed running, there are several inexpensive hand held digital temperature

gauges available you may want to invest in.

About the Radio

The JR radio installed in the Aftershock is a professional level system with more than the

usual features you may find useful. Be sure to read through the Radio manual

included for complete instructions on what and how to use these. The following

is a simple guide to commonly used and referred to items needed to run your truck.

1. Power Switch - Turns your transmitter ON and OFF

2. Steering Wheel - Controls the trucks steering

3. Steering Trim Tab - Allows you to fine-tune the neutral

position of the steering

4. Throttle Trigger - Pull back for throttle and push forward for brakes

5. Throttle Trim Tab - Allows you to set the idle/brake of the truck

6. Transmitter Dislay - Digital readout shows battery voltage, frequency,

feature functions/settings.

7. Transmitter Antenna - Transmits signal to the receiver in the truck.