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Yamaha 25 Carbs Draining

S

Scottnid

New member
Hello Forum,

I have had many boats over the years but recently bout a small fishing boat with my first ever outboard. It an approximately 22 year old Yamaha 25 hp long shaft (oil injected). It looks well taken care of and starts on the first/second pull every time.

I took the boat out for the first time a couple of days ago and the motor ran great. After the outing i flushed it with clean water about 5-10 minutes. killed the nmotor and depressurized the fuel tank.

The next day I noticed a dark spot under the motor. It appears that all of the gas in the carbs drained out and ran down the low end.

Should I have disconnected the fuel lines and ran the motor dry. I have read that that is a bad thing for injected motors. Am I storing this outboard wrong? Any advice is appreciated. I have already looked in the Yamaha owners manual...no info there...

Scott:mad:
 
Normal because you ran it for 5-10 minutes the motor does not get warm enough to burn all the fuel mix off. You probably would not have noticed it if you didn't run it to flush it. Otherwise perfectly normal for a two stroke outboard
 
flyingscott said:
Normal because you ran it for 5-10 minutes the motor does not get warm enough to burn all the fuel mix off. You probably would not have noticed it if you didn't run it to flush it. Otherwise perfectly normal for a two stroke outboard
Click to expand...

Thanks for the response! I was just surprised that the carbs drained out and the bowls emptied into the cowling (then ran down the outside of the low end)...I depressurized the fuel line by opening the tank cap...doesn't seem "normal" for the carb bowls to empty out...but I've never owned an outboard...I do keep stabilizer in the fuel always...

Mahalo!
 
If you tip the motor up the carbs will drain if it drained while it was level then you need to check your carbs or do you have a fuel line leaking
 
flyingscott said:
If you tip the motor up the carbs will drain if it drained while it was level then you need to check your carbs or do you have a fuel line leaking
Click to expand...

Flyindscott...the motor was level (in the operating position)...I did check fuel lines and did not see any evidence of leaks...nor did the lower cowling look like it was getting soaked in gas on a regular bases...however, the front of the trailer was higher than the rear of the boat/motor so I wonder if (even though the tank was depressurized) I was getting a gravity feed...the gas tank is up in the bow for better weight distribution...but still lower than where the hose attaches to the motor


Do you know if it is OK to run an oil injected motor until the carbs are dry...I've read both ways do and don't...
 
Try disconnecting the tank even if you depressurized it if you closed the valve and it was warm it just re-pressurized. You do not need to run the carbs dry. If you tipped it up at all the gas ran out of the carb you may not have seen it right away
 
flyingscott said:
Try disconnecting the tank even if you depressurized it if you closed the valve and it was warm it just re-pressurized. You do not need to run the carbs dry. If you tipped it up at all the gas ran out of the carb you may not have seen it right away
Click to expand...


Gotcha...thanks for the advice...it was a warm day...I'll disconnect...THANKS!
 
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