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LoneStar Bass  |  Fishing  |  Repair & Troubleshooting  |  Topic: Water Pressure « previous next »
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Author Topic: Water Pressure  (Read 1145 times)
Clint Abernathy
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« on: June 24, 2010, 02:10:05 pm »
I have a Yamaha 250.....

What should my water pressure be running at Idle, Mid Range RPM's, and High Rpm's?
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Derick Kuyrkendall
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« Reply #1 on: June 24, 2010, 03:40:24 pm »
I have a 250 HPDI and I have this question to my dealer before. At idle my gauge rarely registers anything. At mid range 5-8lbs and at full throttle 12 lbs. I believe he told me you should have at least 10 at full throttle.
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Derick
Clint Abernathy
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« Reply #2 on: June 24, 2010, 03:53:59 pm »
Thanks for the reply Dereck.     Thats what mine is doing also....  Just seemed like it was higher in the past.
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Steve Amburn
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« Reply #3 on: June 24, 2010, 05:10:50 pm »
I have an '06 250 HPDI. At idle, my gauge shows 2-3 lbs., mid-range of 12-15 lbs. and WOT around 18-20lbs.
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Jim Behnken
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« Reply #4 on: June 30, 2010, 11:07:03 am »
MINE SHOWS 12 TO 14 AT WOT
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Ron Miller
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« Reply #5 on: August 14, 2010, 03:56:23 pm »
I was also having a low water pressure problem,  replaced my impeller which didn't change anything. My problem ended up being the popit valve, pulled it off and it had bunch of little rocks in it. Removed the rocks.... back to normal 2-3 lbs at idle 18-20 wot.


http://www.bbcboards.net/zerothread?id=185398 ( pay close attention to the dowel suggestion )
it made the job very easy.
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Tommy Yetts
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« Reply #6 on: August 16, 2010, 09:21:44 am »
You can also stretch the poppet valve spring about 1"and it will help with pressures. You may not see much water pressure at idle on a Yamaha but as soon as you rev it up a little it will register.
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Tommy Yetts

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Derick Kuyrkendall
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« Reply #7 on: September 03, 2010, 08:25:18 am »
Where is the poppet valve? And is it something easily checked?
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Derick
Tim Spencer
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« Reply #8 on: September 03, 2010, 10:57:03 am »
Derick.

Check out the link posted above.  It shows pics of where it is located.  

Yes, it is easy to check.
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Derick Kuyrkendall
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« Reply #9 on: September 03, 2010, 01:31:07 pm »
Thanks. I'll check it out
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Derick
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LoneStar Bass  |  Fishing  |  Repair & Troubleshooting  |  Topic: Water Pressure « previous next »
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