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SQRACING.COM.AU

SPECIAL NOTE

If your engine is turning over very slowly due to a fl at battery STOP CRANKING THE 

ENGINE IMMEDIATELY. 

This is very damaging to the starter motor and the starter relay.  Turn the ignition off, and 

charge the battery. A Kartelli Corse 6Amp battery charger should give the battery a boost 

to be able to start within 30 minutes.

If the battery is fl at, instead of the starter motor drawing 50 Amps at 12 Volts to start, a fl at 

battery will actually draw 80+ amps at 8 Volts low speed. A fully charged battery makes 

engine starting much easier. The Cheetah® engine does have a built in alternator to 

keep the battery topped up, but it is NOT a battery charger. It is designed only as a trickle 

charger, and to not drain the battery once the engine is started. 

Technically, what happens is the battery boosts the spark at starting and whilst idling, and 

is actually a very small drain on the battery, but above 5,000 rpm the alternator will give up 

to 0.3 amps of charge to the battery. A well charged battery will last a very long time, but 

a top up charge from time to time will increase the battery life. If we made the alternator 3 

amps then this would take power away from the wheels.

RUNNING THE ENGINE

Now the engine should be running on the stand. If the engine is Revving too fast, turn the engine 

off immediately using the OFF/ON Switch. Adjust the idle screw on the carburetor. Turn the igni-

tion back on, and press the start button. As the engine has just been started, it should start again 

very easily.

If the engine starts and then STALLS, due to any number of normal reasons, including air in the 

fuel system, then another safety feature of the SQ CHEETAH® ignition system will have acti-

vated – THE START INHIBIT.  The start inhibit feature is to stop accidental pressing of the start 

button when the engine is running. Some other brands of engine will actually allow you to press 

and engage the starter motor whilst the engine has already started and running. This can cause 

catastrophic engine failure. To avoid this SQ implemented a feature into the CDI computer which 

disables the starter motor once the engine has started i.e. revving over 1,500 rpm. 

Re-enabling the starter motor and to reset the start inhibit, simply switch the start switch to off, 

and then on again. The short answer is: If you go to start the engine and it stalls, simply toggle 

the on/off switch and press the start button again – easy

Summary of Contents for Cheetah 125

Page 1: ...SQRACING COM AU QUICK START GUIDE EVO CHEETAH 125 Josh Pontello National multi state Champion ...

Page 2: ...SQRACING COM AU Index WARNINGS GETTING STARTED SPECIFICATIONS ...

Page 3: ...HE WARNING LABEL IS MISSING FOR ANY REASON PLEASE CONTACT sales sqracing com au AND WE WILL SEND YOU ANOTHER AT NO COST This kart and engine package is NOT A TOY and should only be used on a race circuit by qualified persons over 18 years or by qualified junior drivers under adult supervision ...

Page 4: ...r the excess will simply be expelled into the overflow bottle once the engine reaches oper ating temperature Constantly overfilling the radiator is a waste of time as the fluid will be expelled If the cooling system is completely empty you will need to fill the system It takes approximately 1 5 litres of coolant When adding coolant to a completely empty system air locks will occur not allowing the sys...

Page 5: ...le adding safety features The drawback is that the CDI is a sensitive device and therefore the kart should never be re charged using battery chargers with the ignition turned on or try to boost starting power by leaving the charger connected while cranking The 12volts output from most chargers is not normally regulated properly and can blow the CDI com puter A simple thing to do is REMOVE the 3 am...

Page 6: ... Replace the spark plug and tighten with spanner The engine is now ready to start but safety first WARNING DO NOT ATTEMPT TO START THE KART ON THE GROUND WITHOUT A DRIVER IN THE SEAT The throttle could be in the open position or the idle set too high This is a potential recipe for disaster Either have the kart on a suitable secure kart stand or have the kart on the ground with a full safety equippe...

Page 7: ...ry life If we made the alternator 3 amps then this would take power away from the wheels RUNNING THE ENGINE Now the engine should be running on the stand If the engine is Revving too fast turn the engine off immediately using the OFF ON Switch Adjust the idle screw on the carburetor Turn the igni tion back on and press the start button As the engine has just been started it should start again very...

Page 8: ...s per standard set tings The supplied B9ES basic spark plug is ok for running in and will help burn the excess oil from low speed running 1 For the first 10 minutes do not run the engine above 70 power Accelerate at 100 but do not let the kart reach maximum speed As soon as the kart hits the power band sud den acceleration point approximately at 8 000 9 000 rpm give it 1 or 2 seconds of pow er then...

Page 9: ... lazy to start lightly choke the air box to give the engine extra fuel Once the engine has started DO NOT IDLE THE KART WHILST STATIONARY as the water pump only operates while the rear wheels are turning Also this will put excess wear on the clutch and the clutch idler bearings Simply start the engine and drive you will warm the engine up much faster under the load of driving than sitting stationa...

Page 10: ...se or decrease overall pipe length For reference the pipe is measured from the weld on the header to the weld on the parallel sec tion of the exhaust This measurement can vary from 410mm to 450mm 450mm give more bottom end mid range power while a pipe around the 420mm will give more power at high rpm Rule of thumb long pipe for bottom end shorter pipe to higher rpm ...

Page 11: ... 27 1 HP 11 100 rpm dyno proven power Restri tor available to limit HP for beginners Max RPM 15 500 RPM with rev limiter set 17 100 RPM Complete spark shut off at 17 250 RPM Carburettor Tillotson European 24mm HL 360A carburettor with integrated fuel pump Head Two piece billet alloy head specially selected com bustion chamber alloy with integrated thermostat Piston SQ54 with exhaust bridge lubrica...

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