Years ago you had a breakin period on a new vehicle whereas today you do not. This is due to the advance in cnc machinery and the added quality control. I have a speed shop near me who will take a fresh rebuild and dyno it wide open. This is due to the precise machine work done and parts used. The problem with our chinese buggies is that the parts we buy are not precise custom parts so a break-in is advised. Most will not do it and have no issues, howeve you take 2 fresh rebuilds using identicle parts in which one you break in and the other you don't. After about 20 hours on each you perform a compression check and find the engine broken in has 5-10psi more comp. as compared to the non broken engine. This results in more power, and longer engine life.
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