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Old 07-08-2018, 03:45 PM
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Default Outboard Jet questions

Anyone have an OB jet that can answer this

I have a Merc 25 jet. When idling I can see good flow out the tell tale and motor sounds good . What Iíve noticed is water squirt out of 2 spots
Both are are center of pump, transom side. We will call it 12 oíclock
One right on the pump houseing that really squirts and one above it in a recessed hole where pump mates with leg, thisnisna bubbling one. Never looked for it before I donít know if itís supposed to or not. I donít see these places identified on any schematics.
Canít say Iíve looked while running on the river
This was just running in a wheelbarrow full of water as I just changed the oil and wanted to check filter for leak and look at oil level.

Thanks
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Old 07-08-2018, 04:51 PM
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Thatís messed up. The old Merc is on its last legs for sure. Iíll take it off your hands for parts...
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Old 07-08-2018, 06:06 PM
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Haha. Nope

Just not used to jet pumps. Not sure where this water is coming from.
Motor is tee top mint. Just wondering about the pump unit
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Old 07-08-2018, 09:57 PM
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I believe it has something to do with reducing water pressure through your motor. The last two Outboard jets I had both had them.
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Old 07-09-2018, 09:35 AM
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What size boat and outboard motor did you run ?
Iím running a little 14.5í legend widebody. With the 25 factory Merc jet.
Iím not sure how they can call it 25 at the jet. Itís a 30hp head with 30% loss Should be a 20hp thrust? No?
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Old 07-10-2018, 08:52 PM
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Changed out the wear ring. About it time Iíd say. Last owner shouldíve done this long ago.
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Old 07-10-2018, 09:55 PM
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Hey Flight, I had the same pump you are using but mine was on a 25hp Merc 2-stroke. I also had a 115/80hp factory Yamaha. All the pumps on outboards are made by California Jets though, just different sizes.

Iíve ran wear rings in the same shape as yours with about .080 clearance and you would be surprised how little difference a new wear ring with .020 clearance really makes. I was really anal about shimming the impellers until I decided to do some tests with the gps prior and after changing wear rings. Not a huge difference in every test I did. Iíd still change them out every year but I wouldnít bother shimming them all the time.

I know everything you read says different but that was my observation...

My Merc was bumped up to 30hp with a bigger exhaust tube and carb work. I figured it would be 20hp at the pump. Plenty on a 1448 Starcraft Jon.
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Old 07-12-2018, 07:17 AM
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Interesting. Iím going through the same stage now. Was getting 30km/hr upstream with 2 guys and 40 downstream.
Speed is ok I want to be able to take more weight.
I will see what happens now with a new ring.

Thanks for the tips.
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Old 07-12-2018, 05:55 PM
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No problem. If you need someone to help weigh the bow down donít hesitate to call. Lol.

I sold my Explorer to a fine gentleman on here a couple months ago and Iím going through withdrawals.
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Old 07-12-2018, 09:04 PM
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For sure we will have to hit the river one day

How far did you go with your jon boat?
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Old 07-13-2018, 04:16 AM
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Quote:
Originally Posted by Flight01 View Post
For sure we will have to hit the river one day

How far did you go with your jon boat?
Basically everywhere up here. Early season in high water was never an issue but come Sept-Oct when water levels got lower Iíd start to hit the rear of the pump. So light and relatively slow though the motor would just kick up with no damage.

I went as far south as the Cascade Rapids on the Athabasca a few times. I donít know if I would recommend that in a small Jon though. Getting through Mountain Rapids was a bit hairy and I turned around there a few times when the water wasnít right.

I also boated the Firebag quite a few times. A small boat was great there because you could launch it right on the Firebag and save the two hour run up from Barge Landing that a bigger boat would need to take.

I still see my old Jon pulled up to the beach at Pedonís Point across from Mac Island once in a while. Iíd consider buying it back if it ever came up for sale it worked that well. Iíd consider buying my Explorer back that I just sold if it came up for sale too so maybe I just have a hard time letting go...lol.
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