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Somebody please explain what VRO is/does?

c11yll Sorry for being an amatuer, the book is on the way! 2002-06-19
angus63 VRO=variable ratio oiling
It is a metering pump that controls the gasoline/oil ratio delivered to your motor (simply stated).
2002-06-19
MGuckin All 2 strokes require oil to be mixed with gas for lubrication purposes. On older motors, and some newer by choice, you would mix 2 stroke oil in with your gas at a specified ratio. Modern motors use a ratio of 50 parts gas to 1 part oil.
VRO takes the place of having to mix your fuel. It is a self contained oil tank that, when working properly, will mix the required amount oil with your gas without your intervention other than keeping oil in the reservoir.
2002-06-19
c11yll Thanks a lot guys.
I was wondering why people disconnect the VRO unit, is it unreliable or something??
2002-06-19
djohns19 c11yll,

The VRO system is one of the most maligned mechanical devices ever conceived by man. It has been blamed for everything from sunspots to hangnails.

Thruth is, most engine failures that are attributed to no or low lubrication
2002-06-19
evin300 Good one djohns! my sentiment exactly. 2002-06-19
Dhadley Very good djohns!

I have seen motors with water in all 6 cylinders and the cause of failure is listed as "VRO failure". The VRO pump didn't fail.....it was pumping what was in the tank. Water.

The only thing I could add is that they have not been "variable" for quite a while. They are now refered to as "oil pumps" because they are 50:1 at all rpm's.

Good post djohns!
2002-06-19
c11yll That's just the answer i'm looking for, my confidence has now been restored. I was thinking for a while there i might have purchased a real trouble maker, there seems to be quite a few people on this site who have/are disconnecting their vro's. With me being new to boating i was rather worried!!
Thanks for taking the time to reply y'all!!
2002-06-19
yrag My Vro just went, But I guess after 17 years thats ok.I Put a new one on without a second thought. (1985 175 Johnson) 2002-06-20
neptune202 The VRO on my `94 Evinrude 140 has just given up. A re-man replacement is only $100 from DFI. Any accessory component on anything, car, motorcycle, truck etc. is subject to failure and would cost as much. I'm keeping the VRO operational. 2002-06-20
neptune202 PS- to correct an earlier post about the "50 to 1" ratio, gas is 50 to 1 over oil. That is to say 1 gallon of oil (outboard motor oil) to 50 gallons of gasoline. 2002-06-20
c11yll can't wait for the manual to arrive, i'm just bustin to get busy on this thing! 2002-06-20
MGuckin neptune202,
And I just mixed 50 gallons of oil in a gallon of gas.
[Big Grin]
I edited my typo.
2002-06-20
seahorse5 For an indepth story on the misconceptions, upgrades, and history of the VRO, get a back issue of either the Jan 2000 Bass and Walleye Boats or the Feb. issue of Trailer Boats. 2002-06-20
Dhadley Double check you warning system to make sure it works. I've also seen a lot of failures because the horn did not work properly.

Good luck!
2002-06-20
keepiton2 i just purchased/installed a new vro pump on my 1989 110 v4 johnson. the salesman sold me new plugs too and said now the new pump gives the motor a 60 to 1 ratio so i had to change the plugs to a plug that would take more heat. just a little tidbit of info...you folks have been a huge help for me in the last few weeks !!!! 2002-06-20

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