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mightydog

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can any one give a lead on a c

can any one give a lead on a couple of 1978 or 1979 carbs for a 140 horse Johnson? I can get the rebuild kits just need the carbs.
 
"your best bet,would be ebay..

"your best bet,would be ebay...or a local dealer,or repair shop...also,try craigs list,in your area."
 
"David,

We have them as new

"David,

We have them as new old stock...

I looked up the part numbers for 1979 140HP.

Upper carb original number was 0389785 superceded to 0391420

Lower carb original number was 0389784 superceded to 0391419

Thanks."
 
"andrew,i was not aware,u had

"andrew,i was not aware,u had OEM replacement parts?...do u order those,or,are u guys a BRP dealer?"
 
thanks for the replies. reaso

thanks for the replies. reason I was asking is that I have a 86 110hp johnson motor. I was told that it has a exhaust bubble from a 140hp motor and that the carbs from a 78 or 79 would fit. since I need to rebuild the carbs I have now I thought I might as well put the bigger carbs on now since I already have the exhaust and the block is basically the same. Or should I use the carbs from a 86 140hp motor?
 
"Yes, your 110 lacks the displ

"Yes, your 110 lacks the displacement to really produce more than the 110 horses it's putting out now.

The 110 powerhead was shared with the 90 and 100 horse. The 110 was the max for the 99.6 cubic inch (1.6 litre) powerhead in use.

The 120 and 140's shared a 110 cubic inch (1.8 litre) head which still actually is kinda short on dispacement to be cranking out 140 horses.

In the 86 model year, the 110 is a cross flow, the 140 is looper, the bore is the same but the stroke is different etc etc etc.

Anytime that the horspower exceeds the displacement, the life of the powerhead is reduced. Motors just don't like to produce more horses than they have cubic inches. A ratio of 1:1 or less is ideal for long motor life. That's why modern high horse engines are often rebuilt long before they see their 10th birthday. When you are cranking 225 horses out of 150 cubic inches sooner or later the stress is going to cause something to let go....

And if even if it could work, which it wouldn't, going from 110 to 140 horses would net you a result of approx 2 more mph under perfect conditions, but would burn 20-30% more fuel "all the time". Not worth the cost even if it is viable to do....

To get a "noticable" performance difference you would have to move up to at least 175 horses or more. For every 50% increase in horsepower (from your current) you can expect 6-7 mph increase at extreme top end.

You could improve your hole shot moving from a 4 cylinder to a 6 which would give you a better torque band.

Any given boat tends to perform at it's peak when fitted with an outboard that is 80% of the max rating for the boat. Adding more horsepower past that point almost always results in more gas burned with very little, if any, noticable performance increase. Any given hull will have a max speed regardless of what you hang on the back of it (and still operate in a stable fashion). If you are fitted correctly, enjoy the boat - besides, you can probably rebuild your carbs 4 or 5 times for the cost of a new pair
"
 
"now now.........lets talk abo

"now now.........lets talk about this...a 140 is a V4----he could easily,go to a V6 150 of ANY yr,..and have a hoss.....my 'basic' thoughts have always been,....if its rated for a v4 u could put the bigest one on there....rated for a v6...same....however.....it cant be a rotted bucket of bolts.....i hung a 140 for example ,on a cajun bass rig,rated for 115.....not a prob at all.what so ever.....if ur boat is rated for a 150---,IF IT IS IN EXCELLENT SHAPE,TRANSOM WISE,U COULD EASILY HANG A 225....been there...done that....
where the prob arises,..is hanging a 200 on a 25 yr old bass rig w/a half rotted transom........yep,......aint gonna wk."
 
OK then so the carbs that Andr

OK then so the carbs that Andrew mentioned in his post above for a 1979 140HP Johnson fit my 1986 110HP Johnson? My serial # is J110TLCDF it already has the exhaust bubble of a bigger motor on it. I need to know if the carbs will work with what I have. Thanks David
 
my motor runs but the carbs ar

my motor runs but the carbs are blowing gas through it at a idle they need to be rebuilt but since I have the better exhaust I want to upgrade the intake with bigger carbs to match
 
Gas blowing back through the c

Gas blowing back through the carbs may be a symptom of chipped or broken reeds (leaf valves).

Pull the carbs and get a look behind them...
 
"JWB - unless I'm totally

"JWB - unless I'm totally misunderstanding things here he has 1 motor. A 1986 110 horse.

He feels the carbs need to be rebuilt and he is trying to see if it's viable to turn it into a 140 because he got info from somewhere saying it could be done. As far as I can see, it can't.

I run accross numerous individuals that want to squeeze a few more horses out of their current motors thinking they will see some major improvements on the performance. I have even taken their money on occassions when they wouldn't listen to my reasons for not trying to hop up their current outboard.

My entire point was, in almost every case simply moving up 30 or so horses when you are talking about a larger motor will result in minimal results at best, and that you have to "significantly" increase horsepower to really see something "noticable" - however, it must be done within what is safe on the boat.

If the boat is already powered adequately, and it's still not enough SPEED, then maybe it's time for a new rig.

In this case going from 110 to 140, even if it was possible by refitting the current outboard, would lead to disappointing results at best. There is just not that much of a performance increase - at least not very noticable.

That was my entire point. I wasn't suggesting that he hang a 225 off the back of a boat that couldn't handle it..."
 
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