I havent hooked up the tach yet but I know the engine isn't maxed out. The tach is my next project. As far as the linkage, all seems tight, no play when the throttle is down all the way. When I reach 80 and start to ease off of the throttle the peddle is about halfway back when I'm able to maintain that speed. My old 300 felt exactly the same at that speed but I was able to get her up to about 115ish (never tried for too long as the cops are bad down in south fl)