VORTEX FACTORY: Via E. Fermi, 5 – 27040 Campospinoso (PV)– ITALY – Tel. +39 0385 765200
VORTEX FACTORY: Via E. Fermi, 5 – 27040 Campospinoso (PV)– ITALY – Tel. +39 0385 765200
OTK KART GROUP srl
Via dei Soprini, 16 – 25080 PREVALLE (Brescia) ITALY-‐Tel. +39 030 6804601 – Fax +39 030 6804698
Rev. 30/09/15
4. STARTING AND BRAKE-‐IN
Break-‐in is required when an engine is new or has undergone a major service of the engine's main
parts (pistons, rings, cylinder or crankshaft). Only a proper break-‐in will insure the best
performance out of your engine in the future and guarantee its long and trouble-‐free life.
1
Prepare fuel.
Vortex engine works with commercial gasoline, leaded or unleaded
,
as well as
racing fuel, with minimum 95 ROM.
Mix oil and gasoline at 3% (i.e. 30cc of oil every 1.000 cc. of fuel).
2
Use a high quality 2-‐stroke oil specifically made for kart engines. We recommend Petronas Rok
Lube, however many others oils with the same features may be used. Check any requirements of
your ASN regarding the use of specific brand/type
3
Shake the can thoroughly to mix the fuel and the oil properly. Then fill the gas tank in your kart.
A mistake in measurements could result in engine damage.
4
Buttons: to start the engine press the green button. To stop the engine press the kill switch red
button.
5
To start a cold engine pull the choke lever up.
6
Press the start button (green) in order to allow the fuel pump-‐to-‐pump fuel to the carburetor.
7
Once the engine starts push the choke lever down.
8
Run the engine by accelerating intermittently to higher RPMs. Do not accelerate to full throttle.
9
Once the engine is warmed up, proceed to the track. By accelerating very carefully, the clutch
will engage and the kart will start moving forward.
10
Run the engine by alternating a few seconds on and off the throttle at ¾ of the opening.
Do not hold the throttle at a constant speed.
Continue this way for 5/6 laps.
11
Check everything on the kart is tighten properly. Be careful, engine and muffler are hot.
12
Return to the track and slowly increase the RPM and duration of the acceleration for
10/15min more. Intermittently open the throttle fully and then release it.
13
After 10/15 minutes of brake-‐in, your engine is ready for competition. During the break-‐in,
nuts and bolts tend to loosen. Once the engine is cold, check the torque of the exhaust, head, etc
