PREPARATION OF THE ENGINE
2 What processes must be carried out before starting a new engine and to perform a correct breaking-in? How is the break-in period implemented on the kart’s stand?
First of all, it is necessary to check that there is oil in the gearbox. Better safe than sorry! Then, yes, a good break-in extends the life of the engine significantly. The most common general advice is not to accelerate for too long when the kart is on the stand, because vibrations cannot be discharged to the ground through the chassis and tires. Therefore, the vibrations can possibly affect the engine in an adverse way, as they cannot be transmitted to the track. During the break-in process, you should never upshift or downshift gears too abruptly. Additionally, make sure that the water temperature reaches 50° C while the engine is warming up. In cold weather it is a good idea to cover the cylinder to retain the heat.
3 How often should I change the reed valves? What kind of wear and tear are they subject to?
Let us say that reed valves, over time, lose their reactivity. They no longer flex as they should, that is at the right frequencies and amplitudes. But, they hardly break, especially those used in the KZ. As for the replacement, I would do it every 3 hours of use for an OK engine while on a KZ used for fun I would change them every two revisions or, at the limit, every 25 hours.
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