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Old 12-02-2010, 09:39 AM   #1 (permalink)
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oil mixture disagreements

hello my friends i have a 2004 f7 i recently removed the oil injection so i can be assured my engine is getting oil. i was wondering what the proper oil ratio is on the "laydown" style motors? ive been told anywhere from 16:1 to 50:1 and everything in between??? maybe its not that important but i would really appreatiate everyones input on this so im not replaceing another motor this year!!!! it has v-force reeds,slp twins w/stingers, R.A.V.E. style exhaust valves , wiesco pistons if that makes a difference?? thank you
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Old 12-02-2010, 09:56 AM   #2 (permalink)
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It is a known fact that 50:1 is a safe ratio for 2 stroke engines. The manufacturer NEVER wants a conflict with warranty issues so a stock sled is about 33:1.?> Hope this helped ?
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Old 12-02-2010, 01:37 PM   #3 (permalink)
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yes this sets my mind at ease thank you!!! now i just need to figure out how to use my new air/fuel ratio meter and all my worry will be gone!! thanx
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Old 12-02-2010, 02:40 PM   #4 (permalink)
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mixing oil is one of the simplest things to do many people are intimidated by it but its really easy it honestly basic math just keep in mind if its 50:1 that would be 5 ounces oil to 1 gallon of gas or if its say 33:1 it would be 3.3 ounces of oil to gas ratio gauges are very self explanitory!! hope this helps
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Old 12-02-2010, 03:21 PM   #5 (permalink)
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50:1 would be 2.56 oz oil per gallon of gas, 33:1 would be 3.87 oz oil per gallon of gas. As the ratio number goes higher, the amount of oil goes lower.

50:1 = 128:x

divide 128 (number of oz. in a gallon) by the ratio to get oz. of oil

128/50=2.56
128/40=3.2
128/32=4.0

None of which has anything to do with an air/fuel ratio meter
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Old 12-02-2010, 05:57 PM   #6 (permalink)
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Here is a nifty calculator that will take out ALL your concerns... I hope this helped ?
Gas Oil Mixture Ratio Calculator
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Old 12-02-2010, 06:04 PM   #7 (permalink)
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Old 12-02-2010, 06:24 PM   #8 (permalink)
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LOL, Hey whatever get's peace of mind my friend !....
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Old 12-02-2010, 07:45 PM   #9 (permalink)
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Stay with the oil pump! You are asking for trouble! The oil pump puts the oil too the bearings! Premix wont get there as well!
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Old 12-02-2010, 09:38 PM   #10 (permalink)
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I agree with kccats. Just fix the problem and ride the thing. Otherwise you will need to carry oil with you for every fill-up which would be a pain in the a**.
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Old 12-02-2010, 09:54 PM   #11 (permalink)
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someone honestly told you 16:1? wow! Only run that if you want to swap in new plugs at every gas fill!
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Old 12-02-2010, 10:00 PM   #12 (permalink)
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my 50's outboards run 30:1 and they have bushings, not bearings. Keep that in mind. Anywhere below 40:1 for this engine is just ludicrous!
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Old 12-02-2010, 10:01 PM   #13 (permalink)
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Quote:
Originally Posted by ajj580 View Post
hello my friends i have a 2004 f7 i recently removed the oil injection so i can be assured my engine is getting oil. thank you
The oil pump on an F7 has 3 discharge lines- 2 of them feed oil to the intake port of the cylinders. The third one is attached to the bottom of the crankcase and is a direct feed to the center of the crank where the brass gear on the crank drives the water pump shaft. There is no other way for oil to get to this gear. How did you address that?
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Old 12-02-2010, 11:23 PM   #14 (permalink)
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hey any motor sports store you go to sells the measuring cup that is made to pre-mix. If you are an owner of a pre-mix sled it is nice and clear cut, so give your wife her measuring cup back!!
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Old 12-04-2010, 12:39 AM   #15 (permalink)
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thank u all for the information a really appreatiate it. very helpful !!! My reasoning behind the change to premix a shreaded belt took out the oil supply line = new motor i am trying to avoid that again.
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Old 12-04-2010, 06:50 AM   #16 (permalink)
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I got to thinking more about ratio. I race Karts with a 2-stroke Yamaha engine on it. If we run a can on it the mixture is 22 to 1. If we run a pipe, we mix it at 16 to 1. Proper ratio is a good question then. I was always told you could drop a little oil in the tank anyway and it wouldn't hurt anything.
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Old 12-04-2010, 10:47 AM   #17 (permalink)
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Is this EFI or carbed?
If EFI, you should not mix oil into the gas, but hook the pump lever wide open until the line is clear of air.
If carbed, mix 50:1 and run it.
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Old 12-04-2010, 10:58 AM   #18 (permalink)
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in our outboard we mix the gas 100:1 (or so) just in case the VRO (oil injection) cuts out. These engines are notorious for doing that so we keep it as a backup and it still works great.

I would suggest to keep the oil injection, and just put a dab of oil in the tank every time you fill up. Or next time you shread a belt, just check to see that your oil line is in tact.
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