Cirrus 3CFM Instruções de Operação descarregar pdf (Página 16)

Page 16

If, during the break-in process, the pull-starter slips when you try to start

the engine, the one-way bearing and pull-starter shaft may be coated with

excess fuel oil. This can occur because the excess oil in the engine during the

break-in process gets into the one-way bearing. To x this, carefully remove the

one-way bearing and the pull-starter shaft, clean them with rubbing alcohol and

reassemble the parts. Use the exploded parts view to see how the parts are

assembled. Also, be careful when removing the pull-starter assembly to ensure

that the recoil spring does not uncoil and y out. After removing the screws

securing the pull-starter, carefully insert a at blade screwdriver between the

engine backplate and the pull-starter. Apply slight pressure against the

pull-starter to help prevent the recoil spring from uncoiling. Temporarily secure

the pull-starter with a rubber band or tape while cleaning the one-way parts and be very careful when reassembling the unit.

The use of eye protection during this procedure is strongly recommended.

ENGINE BREAK-IN TIP - WHY IS MY PULL-STARTER SLIPPING?

One-Way

Bearing

O-Ring

Backplate

Bolts

Pull-Starter

Shaft

Cushion

Spring

Pull-Starter

Cord

Spool

Recoil

Spring

Pull-Starter Handle and

Cover Assembly

Retaining Bolts

STEP 2: FINE TUNING THE ENGINE

After your engine has been broken in, you can set the high and low speed needle valves for optimum engine performance.

Be careful to never lean out the engine too much. Remember that the lubricants for your engine are suspended in the fuel. If you

lean out the fuel mixture too much you will also be lowering the amount of lubricant entering your engine. Less lubricant means more

chance of your engine overheating and possible engine failure.

WARNING ABOUT TUNING YOUR ENGINE

q Start the engine and remove the glow starter from the glow plug, then allow the engine to warm up for about 10 seconds.

q After the engine has warmed up, drive the XS

T 4WD Truggy RTR as you normally would. If the engine seems to be running rich (i.e., not

reaching maximum power), lean the high speed needle valve about 1/16 of a turn (turn clockwise) at a time until the desired setting is

achieved. Use a temperature gun to ensure that the engine is within the suggested temperature range 99~110ºC (210~230ºF) and

always make sure that you run the engine slightly rich - you want to be able to see a faint exhaust trail at all times.

SETTING THE HIGH SPEED NEEDLE VALVE

q Start the engine and lean out the high speed needle valve as per the procedures above. Close the throttle until the engine slows

down

enough so that the clutch is disengaged and the wheels don’t turn when the XST 4WD Truggy RTR is lifted from the ground.

Allow the engine to idle for about 10~15 seconds.

q W

hile holding the XS

T 4WD Truggy RTR off the ground (making sure to keep your ngers away from any moving parts), quickly open the

throttle in a short burst. If the engine just stops running as soon as the throttle is advanced, the low speed needle valve is too lean and

the engine is not getting enough fuel. With the engine stopped, richen the low speed needle valve about 1/16 of a turn (turn counterclock-

wise).

q Restart

the engine and repeat the procedure above until the engine will transition smoothly and quickly. Very slight hesitation in the

transition is normal.

If you quickly advance the throttle and the engine seems to be very rich during transition (i.e., lots of smoke coming from the tuned

pipe and very rough sounding), the low speed needle valve is too rich and the engine is getting too much fuel. With the engine

stopped, lean the low speed needle valve about 1/16 of a turn (turn clockwise).

q Restart

the engine and repeat the procedure above until the engine will transition smoothly and quickly. Very slight hesitation in the

transition is normal.

Now drive the XS

T 4WD Truggy RTR as you normally would for a while to get a feel for how the engine reacts to throttle. Now that you

SETTING THE LOW SPEED NEEDLE VALVE

To get more power from your engine you can use fuel containing up to 30% nitromethane. We must caution you, though,

that once you run the engine with increased nitro you may not get satisfactory results if you decide to go back to a lower

nitro content. Also, if you use fuel containing 30% nitro, we suggest adding a .10mm head gasket to lower the compression

ratio. If you don’t lower the compression ratio, overheating and erratic running will likely occur. You may also nd it

necessary to run a 'cold' heat-range glow plug to ensure satisfactory results.

PLEASE READ IF USING 30% NITRO FUEL

P/N 148418

.10mm

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Cirrus 3CFM Instruções de Operação Página 16

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