Ok here goe's.I've been working at a local marina since march.Suddenly I get a customer complaing about a poor running motor.He say's that our shop just put in the motor 2 seasons ago, well i checked the records, and yes we did.The port motor actually has been replaced 7 times in 10 years,keeps blowing up!Did all the basics, comp, timing.vacume-getting low along with compression.I tried switching carbs, then port ran great and starboard ran crappy!Upon comparing carbs, I see the port carb is missing the upper air valve on the secondary.{the weighted plates}I truely belive this is causing a very lean condition and burning up the engine every couple years.Am I correct?
