88 , 150GT Johnson

[rogerd8]

Got a question here guys this motor runs real rich and was thinking maybe one of the carbs is fouling out . at times it will run fine at WOT but then at times can't get into WOT but smells raw fuel not bruning ,,, any Ideals help me out here.

 

[jim dozier]

Re: 88 , 150GT Johnson

Float is sticking open. Rebuild carbs.

 

[rogerd8]

Re: 88 , 150GT Johnson

Thanks for the reply there ,, next would the carbs fit off of a 175 HP ,,they are rebuilt and ready to use

 

[rogerd8]

Re: 88 , 150GT Johnson

Thanks for the reply there ,, next would the carbs fit off of a 175 HP ,,they are rebuilt and ready to use

 

[jim dozier]

Re: 88 , 150GT Johnson

Don't know about the other carbs, somebody else will probably know and chime in.

 

[clevecan]

Re: 88 , 150GT Johnson

I may be wrong, But I think the GT150's have 175 carbs

 

[jonesg]

Re: 88 , 150GT Johnson

Float is sticking open. Rebuild carbs.

Jim that could be correct, or wrong.
Its also likely its dropping a cyl due to ignition than flooding out.
A timing light will show which.
Also , hold the back of your hand 1 inch from the carb throat, if it gets wet with fuel spray its flooding.

 

[emdsapmgr]

Re: 88 , 150GT Johnson

Check the serial number on the top of the powerhead. The high performance 150's (GT/XP) were all stamped 150S on that top casting plug. The S in the serial number indicates that it is a GT/XP model which comes with the larger-throated 175/(early 200) carbs. You should see 1 5/16" throated carbs on that engine. The carbs have their size cast into the front lip of each carb. That S model engine will make 10% over a normal 150 hp from the factory, or nearly 165 hp. Won't help to jet those carbs up even more, unless you change heads, port it, etc. I'd follow up on Jonesg's comment and check the spark.