I’m running 50:1 fuel mixture and wanna run 40:1

Question

Hey hey everyone good morning. I have a 2013 ktm 250 sx and I’m running 50:1 fuel mixture and wanna run 40:1. Would it be ok for me just to switch to 40:1 or do I need to adjust some stuff so the bike will run it


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Ryan 6 years 0 Answers 2453 views 0

Answers ( No )

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    How hard do you ride the bike ? Have you fouled plugs at 50:1 ?

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    It depends on the oil. Amsoil Dominator 2 stroke oil is made to be run at 50:1, if you are using Yamalube, it can be mixed at 32:1 or 40:1.

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    Leave it at 50:1 . Manual calls for 60:1.

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    If it runs good leave it alone. Change your jetting if needed. Also depends on the oil you buy. See what it recommends

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    Just curious why you want more oil?

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    Dirt Bike channel on YouTube has a great video on this very topic.

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    To much oil is better than not enough oil. I'd go 40:1… just keep an eye on plugs. U may need to bump up jetting. More oil means less gas because the oil is taking up more space than before

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    You can run 32.1 if jetted properly

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    Just think of your crank bearing! That is alot of rpm with little to no oil. But I also run the older 2000 model bikes.so they are on a 32.1 diet.

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    I used motul a 100:1 in the past the new blend 50:1 or 70:1 depending on the jetting. Don't be fooled think oil mixture is the same as rich or lean. That is all jetting

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    It more depends on the oil you are running. Read the label on the oil and stay in the range recommended by the oil manufacture. My KTM recommends Motorex at 60:1. Big changes in oil ratio will affect jetting. Too much oil can start to burn dirty and deposit carbon in the motor.

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    Anyone know a good jetting adjustment video?

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    Look up what pipe you have on it.reeds and so on. Do a plug chop.google it.start with clip in the middle air screw 1 1/2 to 2 turns out

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    I have the same bike . I run 60:1 amsoil saber . And she runs perfect.

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    Amsoil Interceptor, 100:1

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    I run 60:1. Do what you want. You can even go to 80:1 … the Beta and EFI KTM do.

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    First question is WHY? Use what they recommend 60:1 or 50:1 but would not go lower. The lower specs are for older 2T's and come from mineral rather than synth oil legacy. The new engines want a lean mix. The new TPI's are using 80:1 FI mixes.

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    I always ran 32:1

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    50:1 is kinda Lein

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    40:1 is better that's more oil in the gas u need to get away from 50:1 cal unless u wanna burn through top ends

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    No need to run 40:1 dude. You will have plug problems and will probably oil soak your exhaust packing. Stay at 50:1 better yet run 58:1 like me

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    I always run 32.1 and for gas I use supreme and amsoil

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    32:1 man

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    I have over 160 hrs on my 2014 250sx, been running motorex at 50:1 the whole time, original bottom end, due for its fourth top, still runs sweet and strong, no splooge!

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    you boys need to go to team green. my 06 250f had a top end at 170hrs and is at 230ish now only done valve clearences stock barrel .compression still at 90% do oils and filters every ride regardless of hrs

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    25:1 is more than enough

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    yes more than enough oil by double!

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