Johnson GT 150 V6

[jhorne_03]

i have a 1989 GT 150 and when i put muffs on and started it there was smoke which seemed to be exhaust smoke exiting from the prop. Please if anyone could help.

 

[emdsapmgr]

Re: Johnson GT 150 V6

Sounds normal.

 

[Chinewalker]

Re: Johnson GT 150 V6

It's a 2-stroke - the lubricating oil enters the combustion chamber along with the gasoline as part of the mix. Your motor has something called VRO (Variable Ratio Oiling). It mixes the oil with the gas as part of the fuel pump. It will smoke, particularly at start-up.
- Scott

 

[dajohnson53]

Re: Johnson GT 150 V6

The prop area is the normal exhaust outlet for most (all?) outboards*. As Chinewalker said, 2 strokes put out a lot of smokey exhaust, so what your'e seeing is probably normal.

*This is the reason that a lot of tune up steps have to be done with the engine in the water rather than on the muffs. The exhaust is designed to come up under water. The water resists the expulsion of exhaust (i.e. "back pressure), which impacts how the engine runs. The most common adjustment that an amateur (like me) encounters is the idle speed. If on the muffs, it has to be a little high, or it will be too low once in the water.

 

[Monkaroo]

Re: Johnson GT 150 V6

The prop area is the normal exhaust outlet for most (all?) outboards*. As Chinewalker said, 2 strokes put out a lot of smokey exhaust, so what your'e seeing is probably normal.

*This is the reason that a lot of tune up steps have to be done with the engine in the water rather than on the muffs. The exhaust is designed to come up under water. The water resists the expulsion of exhaust (i.e. "back pressure), which impacts how the engine runs. The most common adjustment that an amateur (like me) encounters is the idle speed. If on the muffs, it has to be a little high, or it will be too low once in the water.

Yeah mine smokes quite a bit when cranked on the muffs , and idles several hundred rpm's higher on muffs than in the water . I actually had my rpm's at idle set about as low as I could set them and was thinking it was much too high until I put it in the water . It was just like you said though . Big difference . I cranked mine on the muffs yesterday and she really smoked there for a few minutes till it warmed up . It settled down some then , but was still pretty strong smoke .