Northbay,
Don't know if you got this up and running yet with the cold snap going on. Denny hit the nail on the head. That 150 is Notorious for carbon build up.
If the motor has not been De-Carbed and has been sitting for awhile its time to knock it out. I would suggest a couple of things to really help that.
First off Use Seafoam and do a Super deep De-Carb. I actually take the Airbox cover off and fire up the engine on the hose and shoot Seafoam straight into the carbs several times. Then Load it up good and kill the motor. Let it sit for about 15 mins. Fire it up on fresh fuel from an auxillery tank and run it for a few.
I will do this 2 to 3 times. Once you have done that.
Pull all 6 spark plugs and check your compression then? If you have good even compression I would then suggest Rebuilding the carbs before you run it out much. Just my 2 cents and no change required.
Good Luck.. One of my Favorite Engines you have there.
Robert
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