I ran the stock cam with the 62mmx60.8 stroke 183cc motor and a p&p head that I did myself and got big results with the stock motor. But with the stock cam in the 183cc motor it had no top end only bottom end grunt. After the A12 cam it was night and day performance gain. Just after 30minuets of hard running the power would go away on a hot day. If I let it cool for a hour it would run great until it got hot again. But at night in 60 degree or cooler it runs awesome.
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