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Author Topic: Math Experts...Fuel/Oil Ratios Question  (Read 1775 times)
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txsteele
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« on: October 08, 2018, 08:38:16 AM »

Math experts! I switched to Motul 800 for my KX125 recently and put 2.5 gallons of fuel in my gas can (not the bikes tank) and the fuel/oil ratio is approximately 34:1    I'd like to lean that out to about 40:1   

How much fuel should I add to the 2.5 gallons of oil mixed fuel already in the can to get close to 40:1?   
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reklessj
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« Reply #1 on: October 08, 2018, 01:28:34 PM »

Dude just run that thru the tank at that ratio. And start over next tank. Just f*****g pin it, it's a 125 for Christ sake
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My rides: 1994 KX500, 1988 T4, 1998, ZXI 1100 JETSKI, 2003 MOUNTAIN CAT 900
WIFES (Baby Fiver) rides: 2004 KTM 105SX,1992 LT250R, 1995 ZXI 900 JETSKI,  2011 RMK 600
SONS ride: 1995 YZ125,2002 RM 250
other rides: 2007 RMZ450 RC Ediition, 2003 RMK700
Foxx4Beaver
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« Reply #2 on: October 08, 2018, 01:35:45 PM »

Dude just run that thru the tank at that ratio. And start over next tank. Just f*****g pin it, it's a 125 for Christ sake

Hahahaaaa!!! Love it!!  afro
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Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ
umberto
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« Reply #3 on: October 08, 2018, 02:40:10 PM »

One of theses mixing bottles is a great purchase. It shows you how much oil to get your mixture exactly where you need it for a given amount of gasoline. Itís definitely worth the $5.99, and it has a lid to store a refill for longer trips.

https://www.motosport.com/product/?adpos=1o5&cc=us&creative=281197788420&device=t&gclid=Cj0KCQjwgOzdBRDlARIsAJ6_HNkeHqAxA8a5p2aUsicvrTCnde07mVvxX-x0V_x-Mlk25xbZtQJhQVwaAq6uEALw_wcB&key=Maxima-Quick-2-Mix&matchtype=&mrkgadid=3301755665&mrkgcl=500&network=g&product_id=MXM0019-X001-Y001&psreferrer=https%3A%2F%2Fwww.google.com%2F&pssource=true&rkg_id=0&segment=badger&variant=MXM0019-X001-Y001
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Perhaps I have a dirt bike addiction?

03 KX 250/88 KX 525 - Goliath
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Foxx4Beaver
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« Reply #4 on: October 08, 2018, 03:05:55 PM »

The Ratio Rite is a great item too...even a 4yo can figure it out.

https://www.denniskirk.com/ratio-rite/measuring-cup-rrc1.p2915.prd/2915.sku?utm_source=google&utm_medium=cse&gclid=Cj0KCQjwgOzdBRDlARIsAJ6_HNnm2YKM32ekK_Lg8bpbyaQ9FREaogR1dzTn3W3pTaSvS8ORJ15L2lAaArHWEALw_wcB&ad=228601179045
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Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ
sandblaster
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« Reply #5 on: October 08, 2018, 03:54:35 PM »

Just a thought, Motul 800 is designed to run at 50:1 for hard core racing applications and 66:1 for trail riders.
I've been running it for 8 years at 50:1 with no issues.
Remember... more oil means a leaner fuel/air ratio....
Yes... I did say that  wink
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.
Foxx4Beaver
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« Reply #6 on: October 08, 2018, 04:01:23 PM »

Exactly...prepare to change jets/jetting if you start changing ratios....or you can do some ugly damage.
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Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ
motorman455
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« Reply #7 on: October 08, 2018, 04:32:21 PM »

Or for the math, you need to add 56 ounces of gas since you added 9.4 ounces of oil for 34:1 in 2.5 gal (320oz). At 40:1, that's good to make 40 x 9.4= 376 ounces which is 56 ounces more than the 320oz. 2qts is 64oz so that's pretty close....
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txsteele
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« Reply #8 on: October 17, 2018, 10:09:53 AM »

Or for the math, you need to add 56 ounces of gas since you added 9.4 ounces of oil for 34:1 in 2.5 gal (320oz). At 40:1, that's good to make 40 x 9.4= 376 ounces which is 56 ounces more than the 320oz. 2qts is 64oz so that's pretty close....

Thanks Motorman!!!  That's exactly what I was looking for.
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