the box stock project racing engine is slightly different then the harbor freight, costco, and pep boys clone engines.
the yellow "box stock racing engines" are imported by maxxis tire company, through their karting line. the only reason i know this i because my local kart shop owner sells tons of the box stocks and the harbor freight clones. and he told me he has to by the box stock engines from maxxis be cause they import them from china. the only reason that he carry's the harbor freight clones is because we use them at the road coars that i run at.
These are the “Yellow” engines. They are Basically the same as the Blue Clone engines except the Yellow Engines were imported for racing purposes and have more quality control checks at the assembly plant, as well as a better gasket kit than the Blue engines.
:thumbsup: