i just got a used 2009 helix 150 also. mine cranks and idles fine and midrange seems good but the top end feels flat. i don;t think this thing will do anywhere near 40 mph. it is a christmas present for my 12 son so i have not been able to test it yet. i will tomorrow. just wondering on the slide not going to the top. i will check it and let u know back. i will also check my main jet and see what it is for you also.
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