50 hp Johnson Tiller

[berat]

Hi all,

I'm thinking about swapping my 1986 model 30hp johnson with 50hp johnson tiller. Ithink it is 2000 model and long shaft.
I would like to hear some ideas about it,

• Does it have a VRO system or premix oil?
• What do you know about this engine, do you recommend it?

My sib is 1986 model Zodiac MK3 GR short shaft.
Thanks for any advice...
Here is the link and photos

https://tr.letgo.com/tr/i/50-hp-manu...f-b8c390101da8

[Rover310]

First things first... you really don't want to put a long shaft outboard onto a boat with a transom made/intended for a short shaft motor.

A second consideration, is your boat rated to take a 50HP motor?

[berat]

Yes this is my worst topic "editing transom elevation or jackplate"
Rated to 65hp

[VanillaIceCream]

I have the 1998 Johnson two cylinder on my RIB.

It's a very reliable engine. Mine had the oil VRO but I had it removed, the previous owner had water get into the oil tank and injected water vs oil which burned up the power head. New power head now. But that was an owner mistake.

The carbs on these models are known to flood easily when starting- but are good otherwise. I do run mine at very different elevations from week to week..10,000 MSL to 800 MSL so my carbs are probably never "just right".

It's a good reliable engine.

[berat]

Long years ago (93~99) I had this engine too, we had a 4.30 boat 200kg with 50hp. We had too much fun on that. It bever broke. May be because of the VRO it had never had oil dropp or smoke. Clean and smooth better than my 30hp.
We sold it dirt cheap that was an owner mistake.

[VanillaIceCream]

I forgot to add that parts are readily available, either being used or NOS.

erik

[berat]

You may notice that english is my second language

Sorry Erik i didn't understand, what do you mean "10,000 MSL to 800 MSL" is this a flow ratio of fuel&air

[Pikey Dave]

Originally Posted by berat

You may notice that english is my second language

Sorry Erik i didn't understand, what do you mean "10,000 MSL to 800 MSL" is this a flow ratio of fuel&air

Altitude; Metres (above) Sea Level, I'm guessing he spends time in mountain lakes. Although 10 000 Metres is a touch on the high side, there might be a stray "0" in there somewhere

[Rover310]

Originally Posted by Pikey Dave

Altitude; Metres (above) Sea Level, I'm guessing he spends time in mountain lakes. Although 10 000 Metres is a touch on the high side, there might be a stray "0" in there somewhere

I was scratching my noggin at MSL too, as generally no one uses Meters to describe elevation or altitude here in the US... figured he must have made a typo error.

FWIW, I live at 7000 Feet ASL (Above Sea Level) in Northern New Mexico.

[Poly]

I think MSL is just mean sea level, and it should have a unit too - presumably ft in this case.

[Pikey Dave]

Originally Posted by Poly

I think MSL is just mean sea level, and it should have a unit too - presumably ft in this case.

So it could be 10000' above MSL then, still a high lake.

[Poly]

Originally Posted by Pikey Dave

So it could be 10000' above MSL then, still a high lake.

Vanilla ice is in Colorado, so without googling, that doesn't sound impossible?

[Rover310]

Yeah, there are some smaller lakes up around 10,000 ft., although larger bodies of water like reservoirs will typically be at lower elevations in the 5000' to 8000' range.

Originally Posted by VanillaIceCream

... I do run mine at very different elevations from week to week..10,000 MSL to 800 MSL so my carbs are probably never "just right"...

So your carbs must then be jetted for the lower altitude? Which would mean that your motor would be running extremely rich at the higher altitudes.

[VanillaIceCream]

Sorry for the confusion - MSL is Mean Sea Level in FEET above sea level. I'm a pilot and didn't think about it.

Yes - some lakes we go to are 10,000 ft above sea level, the next week we are at a lake 800 ft above sea level.

Most of our boating is at 3600 - 6000ft so the carbs are adjusted and set for that level.

That's a lot of change for a carb, but they work ok without adjustments..sometimes hard to start at high altitude..being too rich.



Erik