We extend to you a cordial "WELCOME ABOARD !" Come on in, make yourself at home, we are a friendly group of enthusiasts, and we also appreciate the classic Chris Craft Roamer, Corsair, and Lancer boats too , as they are all on the same family tree and share much in common !
Well, I have been trying to diagnose a performance problem on Tom Andersons 1970 25 Lancer. Both 150hp 225c.i. Buick V6s start just fine. After maybe ten minutes or so the starboard engine loses power only in the 2000 to 3000 rpm range. Almost feels like the motor is cutting out. Get the engine over 3000 and it smooths out just fine and is flawless up through full throttle. You can cruise all day at 3400, but drop below 3000 and she begins to cut out.
To date I have changed the fuel filter and had the carb rebuilt. Thought I had it licked when I discovered that the coil wire was loose. Snapped it on, the boat ran great the rest of the day. Next day same issue with loss of power in the midrange. The problem is intermittent, meaning; it usually does not happen first run, then acts up for the rest of the trip.
Since the boat has twins, I can swap out some basic parts. i.e. coil or other electronic part.
Any direction is much appreciated.
Also, Ghost Rider has been able to overcome a top end issue: Pushrod was driven clear through the rocker. I have been told the rocker was defective and it has happened before. My fix will be to replace the rockers with roller tipped rockers. Hopefully she will be launched this week.