oil/ fuel mixture

jim bob · 30 July 2006, 10:13

hi anybody out there help with the correct mix for oil / fuel in our johnson vro 70 thanks

stingraymax · 30 July 2006, 10:44

Normaly on a VRO the oil is seperately in a remote tank, but if the vro has been disconected I would think 1/50 mix.

BogMonster · 30 July 2006, 13:42

The book for my Johnson 115GL which has VRO says:

Normal use if VRO is disabled 50:1 (same as if a VRO system is not fitted to the engine at all)

High performance use: use the VRO system and a 50:1 mix in the tank, or if VRO is not used/not fitted, then 25:1 mix in the tank

"Severe service" (whatever that is - I don't see how that is different to "high performance" - use the same as normal use.

HTH

codprawn · 30 July 2006, 15:08

I agree - 50:1 is ok normally but 33:1 or 25:1 if you want to race it. Better too much than too little!!!

yesterday I was asked to sort out a chainsaw a mate had been using. He couldn't work out why the engine had seized. It turned out he thought it had oil injection and had been putting the 2 stroke oil in the chain lube tank!!!

BogMonster · 30 July 2006, 19:21

Can you damage a 2 stroke by putting too MUCH oil in e.g. what would happen if you fed it at say 10:1? (apart from a large oil bill

)

I guess the only likely problem will be fouled plugs (apart from clouds of smoke) - anybody got any thoughts on this?

Jelly · 02 August 2006, 07:38

Simple lots of smoke and fouled plugs and rubbish idling
I know Datchet sailing club with the old OMC 30 and 50's used to run double oiled but with spark plugs with out the metal finger over the central electrode. I think they were called sptifires or some such name and they handled the oil situation easily
James

Nos4r2 · 02 August 2006, 08:18

You CAN actually damage your engine by by using way too much oil-it gets to the point where it's running extremely lean due to the amount of oil in the fuel and will overheat. You've got to use a ridiculously excessive amount of oil in normal use though. (10:1 in a 50:1 engine then using it hard will do it)

BogMonster · 02 August 2006, 10:11

Thats ok then - if I accidentally pour 9 cans of oil into my tank then it would serve me right I guessb

I do wonder about the reliability of the VRO system though - and whether you would know if it went wrong (apart from the inevitable bang of course!). I guess I am a pessimist because I don't understand how it actually works!

Daniel · 02 August 2006, 10:33

i had a 70 VRO with the VRO removed and was told it had been running on 33:1 for years. this is what i ran my old V4 yammie on aswell.