KX Riders

Maintenance & Technical => KX250 / KX125 => Topic started by: txsteele on October 08, 2018, 03:38:16 AM

Title: Math Experts...Fuel/Oil Ratios Question
Post by: txsteele on October 08, 2018, 03:38:16 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?   

Title: Re: Math Experts...Fuel/Oil Ratios Question
Post by: reklessj on October 08, 2018, 08:28:34 AM

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

Title: Re: Math Experts...Fuel/Oil Ratios Question
Post by: Foxx4Beaver on October 08, 2018, 08:35:45 AM

Quote from: reklessj on October 08, 2018, 08:28:34 AM

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!!  :mrgreen:

Title: Re: Math Experts...Fuel/Oil Ratios Question
Post by: umberto on October 08, 2018, 09:40:10 AM

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. It’s 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 (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)

Title: Re: Math Experts...Fuel/Oil Ratios Question
Post by: Foxx4Beaver on October 08, 2018, 10:05:55 AM

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

Title: Re: Math Experts...Fuel/Oil Ratios Question
Post by: sandblaster on October 08, 2018, 10:54:35 AM

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:

Title: Re: Math Experts...Fuel/Oil Ratios Question
Post by: Foxx4Beaver on October 08, 2018, 11:01:23 AM

Exactly...prepare to change jets/jetting if you start changing ratios....or you can do some ugly damage.

Title: Re: Math Experts...Fuel/Oil Ratios Question
Post by: motorman455 on October 08, 2018, 11:32:21 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....

Title: Re: Math Experts...Fuel/Oil Ratios Question
Post by: txsteele on October 17, 2018, 05:09:53 AM

Quote from: motorman455 on October 08, 2018, 11:32:21 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.