I will get a tach soon. Speedo doesn't work either I'm using gps speed off my garmin fish finder. It does too speed of 33 but will go into higher rpm and doesn't go any faster. I'm rebuilding the carbs and reed valves now. Also got spark and compression already checked.
I got a 90 force 120hp that runs down the river decent but it tops out at 33.7mph. My boat is glassport 16.5 foot bass boat I feel like I should be able to go faster. Also the boat has a mercury 18p vengeance prop on it. Any help is much appreciated
