View Full Version : 1991 Yamaha 150 HP

05-22-2006, 03:33 PM
"I am having trouble maintaining idle below 1000 rpm. Prior to launch it ran fine in diveway between 700-800 rpm. Plugs are gaped at .039, timing is within spec, changed fuel filters, primer bulb and anti siphon fittings. Runs like a top on plane, stalls at low rpm when docking, need to constantly hit the choke switch on start up. Could this have resulted in a carb float problem from towing to launch, the gas was topped off last year and a stabilizer added. Its with both motors."

06-07-2006, 10:29 PM
"Sounds like the carbs need to be rebuilt. The idle circuits could be stopped up, the carbs could be out of sync."