Motor not starting right when warm

[Chode2235]

Towards the end of last season my motor started acting up a bit.

It is a Yamaha 150 2 stroke (carbed), and after it starts up (little cold blooded) it fires up instantly the rest of the day, unless you turn it off for a couple hours or so.

When you do that it will turn over and stall out right away, and then it can't be started unless choked and revved up a bit (like cold starting procedure). Once it starts this way it doesn't seem to be firing all that well and sputters and sneezes a bit. Most of the time this works itself out when I run it a bit, but a couple times it was never "right" the rest of the day and would stall or sputter badly when I came off plane.

I'm thinking carbs, fuel pump, fuel, lines. ?

[Rich Z]

check the lift pump for leaks first.

[cwilt]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by Rich Z &raquo;</td></tr><tr><td class="quote">check the lift pump for leaks first.</td></tr></table>

+1

or your primer bulb definitely a fuel issue. that sneeze is sometimes called a "lean sneeze"

[Chode2235]

Lift pump?

Sorry if this is a dumb question.

[All Bites Matter]

I had this problem on my 200. Ended up being the low pressure fuel pumps. Not sure if your 150 has them.