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Old 03-13-2011, 04:00 PM
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Default 2010 Yamaha Water pressure gauge question

I have recently tried installing a water pressure gauge on my 2010 Yamaha 90 hp Four Stroke. I am only getting 2 psi at WOT. I can't seem to figure out where to connect it to the motor. I spliced into a line on the starboard side of the motor with a brass T-connentor thinking this would do. Nope.

If someone could point me in the right direction on this, I would be forever grateful. My pride is a bit stung here.
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Old 03-13-2011, 04:08 PM
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tg
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Am I the only one who doesn't care about water pressure as long as I'm getting a good stream?
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Old 03-13-2011, 04:13 PM
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That is backwards. You don't have to worry about a good stream as long as you have sufficient pressure.

In other words. Your telltale can be completely restricted and you will not over heat as long as you have good pressure.
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Old 03-13-2011, 04:44 PM
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The 225's have a dedicated port. Yamaha guage comes with an
adapter to fit. If you have a Yamaha guage, check with whoever
sold it to you....or contact SIM, a vendor here. Great source for
info and parts.
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Old 03-13-2011, 04:49 PM
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In the vicinity of the thermostat or pressure relief valve there should be a bolt the comes out of the cool chamber on the block. You install a hose fitting in that hole for the pressure gauge.


I have a 90 2 stroke, the thermostat and pressure relief valve are next to each other, I think one above the other and the port is near both of them.

I use a jack plate and venture in shallow water a lot.
The pressure gauge is an instant indication if you have a problem.



I’m usually not looking at the back of my motor to check the pee stream while I'm moving.


I usually check the pee stream when I first start the motor, after that I find the pressure gauge very helpful.
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Old 03-13-2011, 05:29 PM
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Quote:
Originally Posted by tg View Post
Am I the only one who doesn't care about water pressure as long as I'm getting a good stream?

Yes
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Old 03-13-2011, 05:56 PM
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Have None, I upgraded from a 90 2stroke to a 90 4stoke and the connection is nowhere near the same. I left the gauge in the boat and changed engines.
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Old 03-13-2011, 06:29 PM
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Does your block look like this one.

Item 13 should be the plug hole.
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Old 03-14-2011, 04:20 AM
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It's a little hard to tell but yes, I think it does.

Is there a fitting I can buy from somewhere for that?
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Old 03-14-2011, 04:08 PM
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Have None

Thanks, you showed me where and I now have the correct part to make this work.

My pride has been restored thanks to you.

P.S.

you should Get Some.....
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Old 03-19-2011, 03:24 PM
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Unfortunately, that wasn't it. that plug was covered in carbon, some kind of exhaust something or other.
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Old 03-19-2011, 03:40 PM
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Quote:
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Am I the only one who doesn't care about water pressure as long as I'm getting a good stream?










Evidently, yes.


A water pressure gauge tells you right on the dash the instant your water intake is blocked.

I haven't owned an O/B powered boat since the early 80's without a WPG. And I've owned quite a few...
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Old 03-19-2011, 03:46 PM
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Default easy to find out

My 2 stroke 250 yami had a plug for the yamaha water gauge-I changed engines to a yami f250 and it had one two
You just need to call Andy and ask him
heres his contact info-this is an easy phone call away
Mark

Andy Munao
Our new parts site: www.simyamaha.com
Yamaha Outboard Sales, Parts and Service
1-800-213-3323 parts@shipyardisland.com
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