Isn't this issue more about buying performance legally, than actually cheating? In my experience one unfortunately can lead to another. As those with less money look for cheaper ways to compete. For example with a GX160 you could spend hundreds, even thousands on selected parts engines and be legal or spend �20 on GX200 head gaskets to get exactly the same result (i.e. optimised head volume) from standard engines. How much time difference this makes in Pro-karts I couldn't say, the issue seems to be somewhat Taboo. But in Cadets the difference can be relatively speaking enormous.
In a slightly different way on a GX120 I need to look at the ports on perhaps 10 heads to find a really good one*, yet my 'French' Competition spend 10 minutes with a Dremel and miniature sand blaster to get the same result AND pass scrutineering.
Regulations apart and on the assumption that no power advantage is gained over the best possible standard engine, especially in a budget class, who is morally right and who is wrong, the blueprinter or the parts selecter?
*Note, before anyone heads (excuse the pun) for the workshop. The already much larger ports on a GX160 seems to actually work better with a narrower throat. But the GX120 exhaust port/valve pocket intersection is the most restricted part of the engine and has a direct influence on power output, but as standard varies in size by up to 30%.
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