Just put my RXT in the water for the first time this season and first time since supercharger rebuild. Could not get over 45-50 mph or 6400-6450 RPM. I'm thinking I should replace the gas with fresh premium fuel, change the plugs and check oil level. Anything else that might be causing my problem? It wasn't my learner key. I put the other key in afterwards and my display read learner key for that one and not the first one.
Check the hoses on the intercooler and SC. Your symptoms are exactly what happens when a hose comes off.
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