97 90hp Merc/Force giving me a headache

[jgiljr]

97 Force 90HP Starts after sitting a day or two no problem whatsoever. The motor runs great 99% of he time.
My problem is during the day after a stop and start or two it is very hard to start.
It will finally pop off and run but takes way longer than it should.
Sometimes after getting it started it will stall out when putting in gear. Other times it runs good.
I replaced the syphon bulb and lines thinking that was the problem but no effect.
Compression is 120 on all cylinders.
Like I said the next time I go to take it out the first fire will work flawless, it's later in the day that has me on the edge of my seat.
Serial# OE250170

[JOE54]

spark on all cyls ????? carbs flooding ????

[jgiljr]

spark on all cyls ????? carbs flooding ????

I am leaning towards carbs flooding. It smokes a bit when it finally starts when it acts up.

[EuropeanAM]

Are you trimming it LEVEL and pumping the bulb firm before EVERY engine start (and on warm starts, using the Throttle-Only feature to crack the throttle open slightly)?

[jgiljr]

Are you trimming it LEVEL and pumping the bulb firm before EVERY engine start (and on warm starts, using the Throttle-Only feature to crack the throttle open slightly)?

Yes on the engine being level. I check the bulb and it is firm. When it acts up, sometimes I have to set the throttle open lever way more than just slightly to get it to start. Other times it will kick over with no extra throttle.

[EuropeanAM]

Are you using a built-in fuel tank, or a portable fuel tank?

If portable... see if you can get a picture of the tank and lines.

[jgiljr]

Are you using a built-in fuel tank, or a portable fuel tank?

If portable... see if you can get a picture of the tank and lines.

I am using a built in tank. The oil injection has been bypassed and I pre mix 50:1

[JOE54]

I am leaning towards carbs flooding. It smokes a bit when it finally starts when it acts up.

tilt mtr pump bulb with front of carbs visible ,no fuel should run out when pumping