Fuel Ratio
Submitted by pharlap on Wed, 2013-05-01 20:49
Can anyone give me any advice on what fuel to oil ratio for a 1999 Johnson BJ130PLEED 130hp V4 Outboard Motor, I've been told everything from 1:25 to 1:50.
Boats was bought 2nd hand so I dont have an owners manual, Ive googled it and cant find a definative answer.
Any help would be greatly appreciated.
Vinesh87
Posts: 2751
Date Joined: 02/04/11
At a guess i would be running
At a guess i would be running 50:1
keg
Posts: 398
Date Joined: 17/07/07
yep
i wouldn`t be going any richer than 50:1. any richer and you will gum things up
pharlap
Posts: 69
Date Joined: 02/01/12
Keg what would cause
Keg what would cause the motor to smoke more closer to 25:1 or closer to 50:1, the motor has just been serviced today and checks out mechanically sound, but it was blowing smoke and running rough, mechanic says 50:1 mix is too rich and recommended 25:1....I'm lost
MattG
Posts: 104
Date Joined: 09/09/09
Hmmm...
If your mechanic said 50:1 is too rich and you should use 25:1, than I'd be getting a new mechanic...
25:1 is twice as much oil as 50:1, more suited to whipper snippers than outboards.
iana
Posts: 652
Date Joined: 21/09/09
A search on the web.
Try these sights.
http://www.outboardrepairs.com/oil_mixture/
http://www.marineengine.com/boat-forum/showthread.php?285148-Fuel-mix-ratio-for-Johnson-motors
http://au.ask.com/web?q=outboard+motor+oil+ratio&askid=0132ad41-4a2f-438f-9875-91d70a6a4cb4-0-au_gsb&kv=sdb&gc=0&dqi=1999%2520Johnson%2520BJ130PLEED%2520fuel%2520oil%2520ratio&qsrc=999&o=620&l=sem
Rig
Posts: 2925
Date Joined: 27/12/06
50:1
I have always run 50:1 on my 40 Johnson with no problems. They are a naturally smoky motor I have been told by various mechanics
Cortez474
Posts: 109
Date Joined: 24/01/12
Plus 1 for 50-1 and johnsons
Plus 1 for 50-1 and johnsons being naturally smoky..... I've tried heaps of different oils through my 40 and she stills blows heaps.....
keg
Posts: 398
Date Joined: 17/07/07
yep
MattG is on the money. 25:1 is a lot richer and would smoke alot more.a two stroke will allways blow smoke. i have a 90`s 75hp mercury and out of the water at
idle and low revs appears to run rough but on the water under load it is fine.older two strokes do run/idle rougher than their new counterparts.
you definately don`t want to be running any thing richer than 50:1. a new yamaha i had a couple of years ago was 100:1but 50:1 is pretty standard
for older 2 srokes.
Paul H
Posts: 2104
Date Joined: 18/01/07
+1 for 50:1 and as above
+1 for 50:1 and as above don't be worried if your johno blows a bit of smoke thats normal.
They also run slightly rough out of water and when first launching/motoring off under low revs but once underway and working they are fine. Mines (1993 70hp) a bit rough as I exit the marina but after getting out and running for a minute on the plane doesn't miss a beat for the rest of the day. Sometimes after restarting after a rest I have to start then give it a quick rev in neutral but usually fine.
Cheers
Youtube Channel - FishOnLine Productions
https://www.youtube.com/channel/UCbUVNa-ViyGm_FTDSv4Nqzg/videos
Rig
Posts: 2925
Date Joined: 27/12/06
Johnson
Yeah that's exactly the same as my 40 2 stroke paul,but it never let's me down
Paul H
Posts: 2104
Date Joined: 18/01/07
yep in 10 years the only
yep in 10 years the only problem I've had is a relay for the tilt/trim going and the motor went up in the air on its own, pull out the relays, release the pressue and lower it manually and were away again (albeit with no tilt/trim until I replaced the relays - now carry spares).
Mines actually oil injected but I considered disconnecting this hence research on the required ratio/mix (was getting too much oil in - eventually worked out it was due to sucking in air in the fuel line, they pump more oil to compensate if starved of fuel - for this reason it also pays to switch tanks before running out of fuel on oil injected models) however after replacing the whole fuel line/bulb etc its back to running like a dream.
The other thing I found to work better was to replace the johno fittings on the fuel tank end to the honda fittings (snap on hose connection type) they seem to work better for me - still have the standard johno connection on the motor but this one fits tight as a drum where as the tank end didn't lock tight against the male connector (I suspect this is where it was sucking air).
Cheers
Youtube Channel - FishOnLine Productions
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Andy_b
Posts: 633
Date Joined: 19/10/11
i run 50 to 1 in my 25hp
i run 50 to 1 in my 25hp merc
20ml to 1 ltr
and i think 25 to 1 is
40ml to 1 ltr
but i would go on what the bottle of oil says!
tim-o
Posts: 4657
Date Joined: 24/05/11
*roll eyes* , I hate two
*roll eyes* , I hate two strokes, but I know how they work. 50:1 IS richer than 25:1. Rich as in more fuel. People think by adding more oil they are doing the engine good but actually you are replacing fuel with oil it doesnt need and so it is lean and an engine running lean will get hotter and then lead to more wear and seizures due to incorrect clearances and the overheated oil not doing its job. Atomised fuel (carburetion) cools the intake charge, so it will hinder performance as well as increasing the heat. If I was going to change the ratio, I would be adding less oil. Less oil will mean less smoke and less fouling of the plugs. Its a 2 stroke, it doesnt matter how much oil it gets, its guna wear out, piss it off and buy a 4 stroke. If I had a 2 stroke, I wouldnt use anything but redline
I am, as I've said, merely competent. But in an age of incompetence, that makes me extraordinary.
RobertMc
Posts: 326
Date Joined: 19/01/09
I disconnected the vro on my
I disconnected the vro on my boat and run my fuel mixture at 60:1, I haven't had any problems with mine so far runs better than it ever did with the vro connected
Old Tub
Posts: 13
Date Joined: 27/12/12
Fuel:Oil Ratio
I have a 2000 Johnson 130 on my boat and service it myself. As you are pre-mixing I assume that someone has been taken in by the VRO myth and the VRO has been disconnected? If so, the fuel:oil ratio should be 50:1. As Paul H said, it will smoke at idle when first started and it may run a bit rough when first leaving the ramp.
Find yourself a new mechanic.
Old Tub
Paul H
Posts: 2104
Date Joined: 18/01/07
The "VRO myth" isn't usually
The "VRO myth" isn't usually a problem with the VRO itself but a sign of other problems. It's usually pumping to much oil in to compenstate for a lack of fuel either a blockage or air leak in the fuel system.
Can also be deterioration on the oil line or one other thing.
The oil tank/bottle cap has a small vent in the top this either gets blocked or fails to release pressure, often on a hot day pressure builds up in the oil bottle as it warms and the pressure then forces extra oil through the oil line and into the VRO system/motor.
Simple solution is to remove the oil cap and on the underside get a pair of pliers and pull the small round thing in the middle off - under this is a spring and a small rubber plug. ditch the spring and the rubber plug and push the round thing back on and put the cap back on/problem solved.
Cheers
Youtube Channel - FishOnLine Productions
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Old Tub
Posts: 13
Date Joined: 27/12/12
VRO Myth
Paul H - Exactly right. There is a very informative article on VRO's here: continuouswave.com/whaler/reference/VRO.html. Well worth a read for anyone with a Johnson/OMC outboard.
Old Tub
Paul H
Posts: 2104
Date Joined: 18/01/07
Cheers Old Tub - great
Cheers Old Tub - great article and increased my understanding of the system - glad I never disconnected the VRO in the end as mixing every time I fill up would have been a pain compared to pour and go After sorting the real problems its running like a dream.
Youtube Channel - FishOnLine Productions
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