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Jerry Ive done the ported head, cam, roller followers, exhaust, timing advance key and a cg300 cylinder. Any main lower than a 132 and it won't rev over 6k before it starts stuttering. I only notice this when the engine is loaded hard for awhile, let off then back on quickly. The part that I don't get is that I only noticed it with this intake setup. Didn't notice it with the other setup I was using but the carb was hitting the frame slightly and the filter wasn't clearing my side cover. Sorry I left out my engine details.
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