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Max Online: 36273 @ 01/23/13 02:34 PM
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#10825366 - 05/07/15 10:45 AM Help.. Overheat-2004 Yamaha 225 hpdi
BiscuitNeck44 Offline
Green Horn

Registered: 06/03/14
Posts: 6
Any help would be appreciated... My 2004 Yamaha 225 hpdi Overheat light and buzzer is coming on when I idle around for any extended period of time (waiting to load at boat ramp, looking for structure on graphs, etc.) The pea stream on the motor is working fine, strong constant stream.. If I put the engine in and out of gear about three times while giving the hot foot some gas I can make the buzzer and heat light turn off and the motor runs fine, never have any trouble when I get up and go and make a run.... Any suggestions on what this might be or how to fix it?? Also will it hurt my motor to continue to use the boat as long as I don't idle around long enough that my overheat sensor comes on? thanks

#10825409 - 05/07/15 11:01 AM Re: Help.. Overheat-2004 Yamaha 225 hpdi [Re: BiscuitNeck44]
CADD Offline

Registered: 08/02/03
Posts: 171
Loc: Spring Branch, TX USA
Most likley a stuck or dirty poppet valve Google "HPDI poppet valve"
2001 Pathfinder 2200V 150Vmax HDPI
2015 Diablo Amigo (Sand Fleck)

#10825475 - 05/07/15 11:21 AM Re: Help.. Overheat-2004 Yamaha 225 hpdi [Re: BiscuitNeck44]
Fish Killer Online   happy
Big Sexy

Registered: 12/11/04
Posts: 24797
Loc: Weatherford
I would get it fixed before running it again.

Poppet valve and impeller job. Takes about an hour.
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#10826729 - 05/07/15 07:03 PM Re: Help.. Overheat-2004 Yamaha 225 hpdi [Re: BiscuitNeck44]
bigtexnick Offline
TFF Celebrity

Registered: 08/27/08
Posts: 7611
Loc: Texas
I'm having a very similar issue on my Yamaha. I've posted here:

I've replaced impeller (the old one was near perfect condition despite being almost 3 years old) and will hopefully change the poppet valve and thermostats this weekend. Work in progress, will report back.
--Nick smirk

#10828344 - 05/08/15 11:27 AM Re: Help.. Overheat-2004 Yamaha 225 hpdi [Re: bigtexnick]
Chris B Online   content
TFF Celebrity

Registered: 05/02/03
Posts: 5641
Loc: Prosper, TX
Have you changed the water pump impeller this year? Needs to be changed once a year.

#10828668 - 05/08/15 01:32 PM Re: Help.. Overheat-2004 Yamaha 225 hpdi [Re: BiscuitNeck44]
ringer Online   content
TFF Team Angler

Registered: 02/27/08
Posts: 3315
Loc: Arizona
My old Yamaha had same and it was the small elbow in the circulation system was clogged. Did the poppit valve as well. I was fishing in an area with a fine sawdust floating in the water and it clogged the elbow before the P hole.


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