Jamara Nexx 8T RTR Gebrauchsanleitung Seite 15

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GB - Running in

Note:

This motor has been constructed to the closest possible tolerances however due to the use of

different materials it will still be necessary to run the motor in to ensure maximum power and

long life.

Preparing for engine set-up:

Make sure that the engine and any attachments are mounted properly and securely.

The parts such as clutch with clutch bell, tuned pipe (exhaust), tank and pressure ports should

be checked before starting the engine. Always assemble an oiled air filter. Use fuel with max.

25% nitro methane. Always use the same fuel for running the engine as you used for setting

up the engine. The choice of the glow plug depends on the temperatures, the fuel type and the

combustion chamber volume of the engine.

As a rough guide, please look at the following:

Less nitro content

More nitro content

Cold outdoor temperature =>

Warm outdoor temperature =>

A classification as a rough guideline due to the combustion chamber volume (expressed in cubic

centimeters) can be made as follows:

Motors from 2.11 to 3.0 cc (engine class 12-18) => Heat value 3 - 4, recommended at

Engines from 3.5 to 4.02 cc (engine Klass 21-25) => Heat value 3 - 5, recommendation

Engines from 4.57 cc engines (motor class 28)

NOTE: Applies only to glow plugs from our range (Jamara, Magnum, Rossi, SH). Other

manufacturer may vary!

The exact adjustment of the ignition timing and glow plug choice has to be determined by trying

different settings.

Starting the motor for the first time:

Fill the tank with the correct fuel. The carburettor needles are factory pre-set for normal operation.

Place your finger over the end of the tuned pipe and operate the pull starter or startbox 3-4 times.

This will draw fuel into the carburettor

and you should be able to see the fuel being drawn in if you watch the transparent fuel tube feed to the carburettor. Connect a fully charged glow plug

power supply to the glow plug and use the pull starter or startbox to start the motor. Be careful not to pull the pull starter out too far as this can damage

the unit. We recommend using a series of short sharp pulls as this will normally start the motor quickly and reduces the risk of snapping the pull start

cord. Due to the way in which the fuel/ air will be distributed within the motor's crank case and cylinder, it is quite normal to have to operate the pull cord

or startbox several times before the motor runs. Once the motor is running leave the glow plug battery connected for app. 1 minute to allow the motor to

reach the correct operating temperature. After the glow plug battery has been disconnected slowly open the throttle and ensure that the motor continues

to run and increases it's RPM.

Running-In:

The motor should be run for 2-3 tanks with the needle in the factory setup. After every tank filling the motor must be allowed to fully cool down before starting

it again. After the 3rd tank you can use the motor with the throttle more opens. REMEMBER, the motor must be allowed to fully cool down between

runs when running-in. This will extend the motors life, increase it's power and failure to run the motor in properly will invalidate the warranty!

Checking the motors temperature:

In normal use the cylinder head temperature should not exceed 120° C. If the motor is run-

ning too hot, richen the mixture by 1/8 of a turn until the correct temperature is achieved.

For accurate monitoring of the motors's temperature we recommend using our Contact

Less Inferred Thermometer, Order No. 17 0133. The temperature should be measured at

the glow plug.

Carburettor basic settings:

If you totally loose the setting for your carburettor here are the correct basic needle

positions. Firstly screw the needles fully in (do not force!).

Main Needle: