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Old 02-24-2013, 09:15 AM   #1 (permalink)
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250r fuel oil mix

ok i am in need of some help on oil to gas mix. I have a 86 honda 250r and i am trying to find out on 2.5 gallons of fuel what the ounces should be in the mix for oil it is the honda oil synthetic in a blue bottle the honda book says 20 to 1 but i guess i need some help on the right mix for 2.5 gallons of fuel also i got the 87 octain gas i did not relize the book sayed premium or leaded octain rating of 92-100 do i need atleast 92 and also do i need to but a lead additive in the fuel thanks for any help
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Old 02-24-2013, 12:36 PM   #2 (permalink)
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a 20 to 1 ratio should be 6.4 ounces of oil per gallon. Quick math tells me that comes to 16 ounces for 2 1/5 gallons of gas. I'll send a link to my source as well. As far as the grade of gas it doesnt affect ratio, but you can run the regular pump gas at any grade and be ok. I will mention ethanol blend fuels suck and are pretty much common everywhere. It burns fine but doesnt store at all. Premix with ethanol in it should be used asap. If you find your quad not running well or starting after a week of sitting clean the carb as it breaks down and turns to crap in no time. I had issues all the time with my YZ 250 untill I figured out what was going on. Id turn my valve off, run the carb dry and keep it that way. The 20 to 1 ratio seems a little oily to me, usually 32 to 1 on Honda's but if thats what it calls for then by all means go for it. Oh, and of all the premix oils Ive ran over the years Klots is hands down the cleanest and best oil out there. Hope I helped... Matt
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Old 02-24-2013, 03:00 PM   #3 (permalink)
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oil mix

with the 93 octain fuel should i put a additive in the gas oil mix that would help
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Old 02-25-2013, 04:44 AM   #4 (permalink)
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DO NOT USE 87!!!if you look aroung you might be able to find a gas station that still sell straight gas.i get mine from charden oil.it's about .20c more but worth it.i also run 50-50,or 75-25 with cam2.if your R has 180psi you need to mix with good high octan gas.32-1 is norm for the 250r.if you do run pump 93 octane gas just mix up what you plan on using with-in acouple of weeks.4oz per.gallon.as said before ethanol will mess up alum. carbs fast so make sure you start it atleast once a week to get the crap out of the carb!!
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Old 02-25-2013, 06:58 AM   #5 (permalink)
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Most of your better oils will have a mix ratio on the bottle of oil for the size motor. I have always went by that instead of what the manufacture says because the manufacture states oil ratio depending on what oil they recommend at the time of quad manufacture. When I had a 250R I ran a belray oil That suggested 50-1. I used it religiously with 115 octane. I never had any problems with that setup. As stated above get away from ethanol gas if at all possible. ethanol and aluminum create water and crud. If you go to walmart in the boat section you will find a bottle for mixing gas and oil, It will have all the different ratios and gallon levels. You just find the column with the ratio you want to use and fill to the gallon level of gas you have with oil, then pour into your gas can. It takes all the guesswork out of it

BTW most marinas sell these, they are called mix bottles.

Last edited by 08700xx; 02-25-2013 at 07:00 AM. Reason: add info
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Old 02-25-2013, 03:08 PM   #6 (permalink)
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Quote:
Originally Posted by 08700xx View Post
Most of your better oils will have a mix ratio on the bottle of oil for the size motor. I have always went by that instead of what the manufacture says because the manufacture states oil ratio depending on what oil they recommend at the time of quad manufacture. When I had a 250R I ran a belray oil That suggested 50-1. I used it religiously with 115 octane. I never had any problems with that setup. As stated above get away from ethanol gas if at all possible. ethanol and aluminum create water and crud. If you go to walmart in the boat section you will find a bottle for mixing gas and oil, It will have all the different ratios and gallon levels. You just find the column with the ratio you want to use and fill to the gallon level of gas you have with oil, then pour into your gas can. It takes all the guesswork out of it

BTW most marinas sell these, they are called mix bottles.
Always mix at what the oil manufacturer recommends, they engineer it, they know how it's supposed to work. I have seen so many people who alter the mix because they think they're making their machine run better, when in fact, they're hurting performance and possibly the engine itself. As for what oil, I too have used Bel-ray MC-1+ for over twenty tears and have never had an oil-related engine issue.
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2007 TRX450R
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1999 CR500
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1996 CR250
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Old 02-25-2013, 05:57 PM   #7 (permalink)
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2.5gals of mixed u plan on riding alot. I wouldn't let mixed gas sit for more than a couple weeks
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Old 02-25-2013, 06:31 PM   #8 (permalink)
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The 1986 250r has a 7.5/1 compression ratio lol I think it will run 89 octane pump gas just fine lol
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Old 02-25-2013, 07:29 PM   #9 (permalink)
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Quote:
Originally Posted by bigphish66 View Post
The 1986 250r has a 7.5/1 compression ratio lol I think it will run 89 octane pump gas just fine lol
You can't base it on that. You need to take a compression test. General rule of thumb has been anything over 200 psi should have race gas or at least a mix. I personally have run as high as 210 with pump gas, but that's pushing it.
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2011 CRA Senior II, Buckeye series, and True Grit series Harescramble Champion
2009 CRA Senior II, Buckeye series, True Grit, and Salem MC Harescramble Champ.
2007 CRA Senior II, and Buckeye series Harescramble Champ.


2007 TRX450R
2005 TRX450R
2004 TRX450R
2003 Lonestar 250R
2001 Lonestar 250R.....now a 310
1986 TRX250R (restored to new)
1986 TRX250R (still in pieces)
1999 CR500
1999 CR250
1996 CR250
1986 ATC250R
1975 MR50
1999 Banshee

Last edited by rich250rracer; 02-25-2013 at 07:59 PM.
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Old 02-25-2013, 07:46 PM   #10 (permalink)
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The psi and compression ratio are two different deals. I wont argue the point.
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