95 yamaha 225 txrt

[turney]

my 225 smokes on startup. it starts and runs fine.but after running for awhile if shut off and restart it produces a big cloud of smoke.wondering if fuel or oil problem. it has 700 hrs and compression is good.

 

[JB]

Re: 95 yamaha 225 txrt

Howdy, turney.

Welcome to iboats.

Sounds to me like it is running out of fuel but not out of oil.

Could be restriction in tank venting or fuel supply from tank to carbs or could be fuel pump problem.

let us know what you find, and good luck.

 

[turney]

Re: 95 yamaha 225 txrt

thanks for the reply. had fuel pumps rebuilt by yamaha mech.thought maybe to much fuel causing smoke.

 

[rodbolt]

Re: 95 yamaha 225 txrt

a certain amount of smoke is rather normal at restart.
however we do see the occasional oil pump shaft seal leak.
the oiling system actually injects oil behind the carbs so fuel isnt the issue,.
also insure the pump arm is within .02" of the stopper with the throttle fully closed.

 

[turney]

Re: 95 yamaha 225 txrt

thanks i will check it.i will also check the fuel valve above starboard carbs.

 

[rodbolt]

Re: 95 yamaha 225 txrt

why check the fuel valve? it has nothing to do with engine oiling as oil is injected into the intake behind the carbs. fuel and oil are mixed in the reed/crankcase area.
its rather normal to smoke at start up, excessive smoke usually indicates a leaking pump seal, a pump arm out of adjustment or a leaking oil line check valve.
what brand of oil are you using? some oils dont work as well as others in the mikuni pumps.

 

[turney]

Re: 95 yamaha 225 txrt

thanks. i have always used yamalube.i will check seal.

 

[turney]

Re: 95 yamaha 225 txrt

a certain amount of smoke is rather normal at restart.
however we do see the occasional oil pump shaft seal leak.
the oiling system actually injects oil behind the carbs so fuel isnt the issue,.
also insure the pump arm is within .02" of the stopper with the throttle fully closed.

thanks Rodbolt; changed pump,set at stopper.as pr manual it smokes a bit but not as bad.where can i get pump shaft seal. i would like to repair old one for spare.