On Nov 25, 5:47*pm, Frogwatch wrote:
My Yamaha 90 hp 2 cycle on my Tolman has always been hard to start if
she has not been run in over a week. *I will crank and pump the bulb
crank some more, pump etc for a Looooooooong time before she catches
and runs in a cloud of smoke. *If she has been run recently, she
starts right up.
Tonight, I started her after a lapse of a month and I was not sure she
would ever start but she finally did. *I then shut her down 3 times
and started her again. *I think, but am not sure that she may be
getting flooded because more throttle makes her not start. *Maybe the
starting problem is getting worse, I cannot really tell. *Maybe I am
squeezing the bulb too much and flooding here, cannot tell. *Ideas?

I don't' know for any kind of a fact, and of course, I could be
wrong, but I take it the Yammy is a two stroke? I don't believe your
squeezing the bulb too much, But I think you might have low
compression, and/or a vacuum leak somewhere.

two cycle engines depend on good compression and no vacuum leaks,
whether it be vacuum at the carbs or in the crankshaft seals.

i bought a used 115 hp v-4 Evinrude that had a new power head
installed. run for a couple years, then it sat for about another 10.
I gave a hundred bucks for it. (Which was a steal!) and even though
the power head was extremely low hrs. I was concerned about the crank
seals being bad (brittle, cracked etc.) just from sitting.

Actually on inspection they seemed in really good shape. so after
cleaning the carbs, changing the impeller, and putting it on a make
shift stand, w/the lower end in a garbage can full of water, we put
some fresh fuel in it and I was really suprised, that it started
rather easily.

You have spark, and fuel, so I'd say it would have to be the
compression or vacuum.