Carbs leaking

[menacer]

I have a 1990 Evinrude 155 commercial engine on my V 20 and maybe someone here can set me strait. I had the 3 carbs cleaned this week and the motor runs pretty good it can only get 4500 rpms, the same as before the cleaning . I would like to get at least 5000 but I can live with it. My main issue is when I tilt the engine all the way up, its almost horizonal and the carbs leak or empty out into the carb cover. When I tilt it back down the gas drains from the cover into the cowling base and down the outside of the shaft housing. I do not smell fuel when its in the down position out on the water so its not leaking when in use just when I have to tilt all the way up.

[macojoe]

I use to get that from my old merc, leaking while up?? Never did figure it out??

What prop you using?? Wrong prop won't allow you to get rpm's up or down, depending what you using

a little more info please. Skools might see this he is the rwsident OMC God, although there are a few others as well!!

[phester]

alot of mercs do that while tilted up.....and Menacer, your floats may be out of adjustment, just a hunch, wait for resident OMC motorhead "Skools out" ;)

[menacer]

Macojoe, Ive tried 15x 15 ss a 15x17 aluminum and a 14 1/4x17 ss stiletto . No matter which prop I try , 4500 rpm is max. The carbs are fully opening , the timing is dead on and advancing ,and compression is good on all cylinders. I even tried raising the motor a hole with no improvement . I've racked my brain ( all 2 brain cells ) trying to get the rpm's up.

[spareparts]

check your tach against a shop tach or know good tachometer

[tsubaki]

I'm almost wanting to agree with phester. Seems we had one that did that and the needle seat was missing or damaged or the float was misaligned, I can't remember. ???

[menacer]

Update, I pulled the cover off the front of the carbs , pumped the ball, and with the motor facing strait I tilted it all the way up and no leak. Then I turned the motor to one side and that's when it leaked. I guess its an over flow that's normal but I still need to know for sure. Now I have a rpm issue I need to address. I'll try the shop tach next and post my results.

[tsubaki]

If you don't mind doing it, remove the plugs to the high speed jets and spray carb cleaner thru each jet. Too many people have told of the same thing about having the carbs cleaned and for some reason most mechanics don't bother doing this.

[tsubaki]

And I do remember an 18hp I had that wouldn't get up to full rpm. Come to find out when the carb was rebuilt they left out the o-ring between the bowl and carb. :P

[Stillrunning]

Did the RPM issue start when the carbs were rebuilt or has it always been an issue?