cutting oil content

cutting oil content (Full Version)

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693bart -> cutting oil content (7/18/2006 6:41:37 AM)
I have a OS 120 surpass that just will not run right on 2 stroke fuel . It loads up on idle and I have adjusted the needle valves and when I get it set so it will not load up at idle then it will die when I throttle up. it runs great on 4 stroke fuel . does anyone know how much methanol I have to add to 2 stoke fuel to bring the oil content from 18% to 15%? the fuel has 15% nitro and 67% methanol and the 18 % oil (caster/synthetic blend) The lhs does not carry 4 stroke fuel and the next place is 120 miles away but cant ship because it is considered Dangerous Goods

wcmorrison -> RE: cutting oil content (7/19/2006 4:10:32 PM)
I rather doubt the use of 2C fuel is your problem. How old is the fuel that gave you the problem? Sounds more like it needs a little better tuneing to dial in the needles for the different fuel. Changing from one level of lub to another does cause changes in the needles. As a matter of course I use 2C fuel all the time in my 4Cs. I have a Saito 91s, Magnun 91, Magnum 52 and a OS Surpass II 70s. All do well on the fuel of the day. Cheers, Chip

downunder -> RE: cutting oil content (7/20/2006 7:55:46 AM)
I have to agree it's something other than oil content because a 4 stroke simply can't load up like a 2 stroke. My guess would be either the tuning or the plug if the fuel is OK.

RaceCity -> RE: cutting oil content (7/20/2006 1:34:43 PM)
Who knows what it REALLY is, but I had an OS 1.20 Surpass awhile back that ran like absolute cr_p on 20% oil, 2C fuel. No amount of needle twiddling would get rid of the "congestion". Going to a lower oil content "4C" fuel made the motor very happy.

693bart -> RE: cutting oil content (7/22/2006 7:00:12 AM)
I have tried 2 stroke fuel before and just like this time it loaded up . I have spent 3 trips to the field and tried setting the needles with no luck but I have been told by different people that the some 120 OS will do this but smaller OS 4 strokes will work and so will Saito so I guess will just have to wait till I can get some 4 stroke fuel .

Fuelman -> RE: cutting oil content (7/22/2006 3:22:13 PM)
I had one OS 120 Surpass that would run on nearly anything I put in the tank (within reason), high or low oil it did not matter. My other OS 120 ran like junk with anything but 14% or 15% oil in the fuel, and no more than 15% nitro. Both were the same series of Surpass. I never figured it out.

carrellh -> RE: cutting oil content (7/22/2006 5:51:43 PM)
I have no idea whether it will solve the problem but I did calculate the answer to the question you asked. Adding 26 ounces of methanol to a full gallon of fuel that has 18% oil and 15% nitro will give you 72.57% methanol 14.96% oil 12.47% nitro If you want to maintain the nitro percentage, add 3.9 ounces of nitro and 22.1 ounces of methanol

RaceCity -> RE: cutting oil content (7/22/2006 8:35:48 PM)
Depending on what your LHS has to offer...mixing some "tiger blend", etc (low-oil fuel) with a gallon of your regular 2C blend in a 50/50 mix should give you somewhere around 15% oil in the resulting brew. I wouldn't go too crazy cutting the oil back. You surely wouldn't want to be much below 15% IMO.

Fuelman -> RE: cutting oil content (7/23/2006 6:21:53 AM)
Get a gallon of 20/20 fuel from most any manufacturer, and add 43 oz of methanol to it in a larger container, your net result will be extremely close to 15% nitro / 15% oil fuel (within a fraction of a percent).

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