Combustion
Ok guys need a lil help I ordered a yx140head with a combustion that has a diameter of 45mm where as my cylinder 55mm so they obviously don't line up, I contacted the guy he reckon that a head with 55mm combustion chamber is for a 150cc, but my bike is a wpb 140 also what I really want to know is will they work the combustion chamber being smaller than the cylinder
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