Yamaha 150 4stroke hot start issue.

[R3RUN]

Hi,
A couple of years ago my dad bought a 21ft Cobia for us to use in the intra coastal down here in Florida. Recently we've been having a problem with the motor not wanting to restart after running for a while. If you let it sit for about 30min-1hr without trying to crank it, it starts up. Starts without issue when cold but after running for a while it won't start. Any ideas? I thought I had read before that this was a common issue. I'm hoping to get it fixed so I can take the boat out this weekend without problems.

Thanks in advance.

 

[Yamajoe]

Re: Yamaha 150 4stroke hot start issue.

test both electrothermal valves, fault maybe causing rich fuel situation.

 

[rodbolt]

Re: Yamaha 150 4stroke hot start issue.

there are no electrothermal valves on the F150.
check the tech bullitens for the primary ID on your engine.
there were some that had an issue and were covered regaurdless of warrenty status.

 

[boatguy823]

Re: Yamaha 150 4stroke hot start issue.

tech bulletin 02005-004 from yamaha covers the hard restarting problem.