I’m going to translate this from English to Spanish as I’m not confident to translate what I want to say accurately in Spanish 
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it sounds like you have done everything right in cleaning the kart and engine. I would recommend checking out the post on “how do you transport your kart” or "what is your trailer setup for karting.
Parece que has hecho todo bien al limpiar el kart y el motor. Te recomiendo que consultes la publicación sobre cómo transportar tu kart o cómo es tu remolque para karting.