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Old 11 February 2004, 19:03   #11
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My Yamaha v4 had the auto-lube removed. I was lead to beleive it had the jets enlarged as part of this... but i don't realy understand why, adding another 0.5% volume of liquid (50:1) would not require this. Is it because oil molocules are larger or something?
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Old 12 February 2004, 07:40   #12
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I can't fathom that one either, Daniel. A jet could possibly be smaller since there would be more petrol.

However, as an aside, it is not a bad idea to run a 2 stroke a little on the rich side. The extra fuel will keep the charge temperature down a bit (latent heat of evaporation), consequently, the charge into the crankcase will be more dense and, therefore, there will be more of it. Also, it gives a bit of security when running hard because high piston temperature is not a good idea.
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Old 12 February 2004, 08:44   #13
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Johnson 150 VRO
Sell the engine --- FAST!

My 140hp Johnson was scary on the old fuel consumption.

It burned in excess of 6gals per hour on my 6.75 Delta (but did make a lovely noise!)

If your running on deck tanks make sure you swop over well before they run out of juice! I was 250 to repair the oil/fuel pump assembly.


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Old 12 February 2004, 11:29   #14
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From the other camp

Just to add a bit of confusion to the debate I personally don't believe in over oiling a 2 stroke.

Excess oil builds up soot under the piston rings forcing them outwards against the bores causing localised hot spots, something manufacturers like quicksilver are keen to avoid by producing low ash oils.

Confused, well just a different view point.

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Old 12 February 2004, 11:48   #15
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Re: Johnson VRO's!!!

Quote:
Originally posted by Suzuki416

DO NOT run the engine on a premix of 150 > 1 as this is too lean.

.

I know i can be a bit of a clown, Pete but not that much. The outboard mechanic claimed that failures of Auto oiling systems accounts for a lot of damage to outboards. His recomendation was to add a bit of oil in to the fuel as a safeguard in addition to the Auto system.
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Old 12 February 2004, 12:02   #16
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To oil or not to oil!

quote: His reccomendation was to add a bit of oil in to the fuel as a safeguard in addition to the Auto system

If your VRO Pump fails (this has been known to happen!) then even if you are running a premix of 150 > 1 this will still not be enough to stop your engine becoming history.

Also you will be over-oiling your engine which is not that good for it either..

The bonus of doing this is you won't need flares! You'll have a nice blue cloud behind you.

Playing safe is 'just running premix @ 50 >1'.

Your engine > Your choice.

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Old 12 February 2004, 16:50   #17
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Ok Pete I'll take your advice on engines and his advice on IT. I think not! He claims that most auto oilers don't actually pack up but deliver insufficient oil when they get faulty, the light premix helps to compensate for this

I trust this man and his thirty years of experience so I will take his advice...the rest of you don't have to!

He would however heartily agree with you that disconnecting the auto oiler and going for full premix is the way to go
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Old 13 February 2004, 08:09   #18
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Thanks everyone.

Looks like I'm going to remove the pump and run pre-mix.

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