those 488's are pretty powerful for a 4 cylinder engine. Search on here about 3.7L engines, they have a few quirks and issues you need to be aware of, beyond that, they work pretty good. What kind of prop are you running? Those engines respond well to large blade surface props like mercury Mirage. I'd try to get it down a little rpm, the valve train doesn't like 5000
I thought the RPM was a little high. It has a spare prop I might try.
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