8
Remove this brass nut assembly into which is screwed the main jet. Hold brass nut in a 14mm spanner and
unscrew jet using a screw driver and replace with different jet.
Then refit assembly into bottom of carb being careful not to overtighten. A variety of carb main jet sizes from
116 – 145 are available from Tal-Ko at low cost.
As you fine tune the carb setting you may need to slightly alter the tick over speed.
Note that temperature and atmospheric pressure may affect the best jet setting to a small degree.
Fuel
Use normal unleaded fuel. You may of course use super unleaded. Remember this engine is a 4-stroke and
does
not
require oil mixed in with the fuel like a 2-stroke.
Warning: Use only unleaded fuel. Other types could cause engine damage.
Warning: When mixing fuel and fuelling do not smoke or allow naked flames. Gasoline fuel is highly
flammable and explosive under certain conditions.
Warning: Never perform fuelling in closed rooms, handle fuel in well ventilated areas only.
Warning: Fuel the kart only when engine is not running and with the ignition circuit in the off position on
the ON/OFF switch.
Warning: Make sure that fuel will not splash onto hot engine components or equipment. Risk of fire and
explosion!
Starting the Engine for the First Time
Before you even attempt to turn over the engine or start you MUST ensure that it has been filled with the
correct level of oil lubricant and water coolant. You must also ensure that the fuel is fully primed into the
carb.
Warning: Always wear protective clothing for kart operation (helmet, overall, gloves, shoes, neck and rib
guards).
Warning: Driver must always be seated in kart when starting engine wearing protective clothing for kart
operation.
First, with the driver sitting in the kart, ensure that the ignition switch is off. Then engage the remote hand
held starter shaft firmly on the crank nut and hold the starter firmly. With the ignition in the off position, you
should then spin the starter for three or four short 2 second bursts just to ensure that the oil has been
pumped around the engine.
Warning: This oil circulation/priming procedure should be carried out each time the engine is started from
cold or left standing for more than 2 hours.
Then switch on the ignition, put the choke to the full on upright position and spin over on the starter without
depressing throttle. As soon as the engine starts remove the starter unit. If you are experiencing problems
with starting, let the engine run for a few seconds without being revved. You will find that with the choke on, it
will run a little faster but also quite roughly. Once it has been running for a minute or so and heated up to
around 28 C try pushing the choke lever down. You will find that the engine falters slightly and should then
pick up speed. What you are looking for is a tick over speed of about 2250/2325rpm. This can be adjusted
with the silver coloured large slide screw on the side of the carb in line with the throttle cable & carb slide. Do
not confuse this screw with the smaller one nearer the engine. This smaller screw should be set at around
1.5 turns out from closed on normal jetting and needle clip position (second groove from bottom on needle).
This smaller screw may have to be adjusted either outwards or inwards if engine keeps stopping of faltering
on correct rpm tick over. If the setting of this screw exceeds 2.5 turns out then a larger than the standard 45
pilot jet should be fitted.
A variety of carb pilot jet sizes from 35 – 60 are available from Tal-Ko at low cost.
