150 gt popping when cold

[Smoke314]

I have a 1989 fiberglass Bass tracker 18 ft boat with a 150 Johnson GT when I started it's like popping back pressure like through the carbs or something almost like backfiring you can hear pressure . Is this normal or what the guy I got the boat from had everything rebuilt in it

 

[racerone]

Well----" everything rebuilt " ---can mean a lot of things.----Any more details ?

 

[Smoke314]

All the carbs were rebuilt ,plugs ,wires,motor was went thru is what he said the shop did. When i first start it it kinda sounds like a intermittent back fire thru carb or something i can hear air pressure till it warms up then it stops .its a 89 johnson 150 gt

 

[racerone]

Many 2 stroke behave like this when cold.------It is called ---" lean sneeze "-----And it is not a well understood concept as you will find in your searching for a fix.

 

[Smoke314]

Many 2 stroke behave like this when cold.------It is called ---" lean sneeze "-----And it is not a well understood concept as you will find in your searching for a fix.

So i shouldnt worry about it then? It kinda makes me nervous about going to far and not being able to start it. But the boat is new to me so maybe I'm just not used to it when I give it full throttle it moves around 60 mph plenty fast enough for me

 

[racerone]

Sorry -----As stated this --" lean sneeze " -----Is not well understood.-----It has nothing to do with the starting ability of the motor.----There are other things to be concerned about on that motor.----You have installed a new water pump impeller ?----Done a compression test for future reference ?----Post those compression values here.