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Old 02-13-2016, 05:59 PM   #1
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Oil to Gas ratio for 2 strokes

What are y'all using for the forest... Apparently I'm not running a lean enough mixture.
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Old 02-13-2016, 06:16 PM   #2
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You're on a cr125 correct? I'd still run 32:1 but whist the jetting if I were you. It isn't necessarily an ideal trail bike though. Always stick with the 32:1 regardless or you'll be rebuilding your crank sooner than you expect.
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Old 02-13-2016, 06:18 PM   #3
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You're on a cr125 correct? I'd still run 32:1 but whist the jetting if I were you. It isn't necessarily an ideal trail bike though. Always stick with the 32:1 regardless or you'll be rebuilding your crank sooner than you expect.
Yessir... Will do, and hitting Rio tomorrow
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Old 02-13-2016, 06:19 PM   #4
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Yessir... Will do, and hitting Rio tomorrow
Sounds good! If I can kick this stomach bug I'll be there as well.
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Old 02-14-2016, 03:58 AM   #5
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40.1, unless your gonna be on the pipe.
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Old 02-14-2016, 06:09 PM   #6
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KTM's run 60:1 but, the older bikes should be ran at 32:1 for sure. whether you ride the forest or 610 loop doesn't matter at all on mixture, look up the specs for your specific year model bike and go with it.
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Old 02-14-2016, 06:24 PM   #7
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Exactly as James said. KTM bikes are weird and run 50:1/60:1 but a 125 should ALWAYS be 32:1 or really close. The manual will definitely confirm but don't ever adjust your mixture to eliminate spooge or lean it out. That should always be done with jetting. You go running leaner mixtures in the fuel and you're going to detonate your crank. 40:1 would be a really dumb move unless you enjoy splitting cases or even replacing them.
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Old 02-14-2016, 06:42 PM   #8
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Gotcha, running 32:1
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Old 02-14-2016, 07:34 PM   #9
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Gotcha, running 32:1
I heard Rio was "da bomb" today. Did you make it out?
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Old 02-15-2016, 09:52 AM   #10
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I heard Rio was "da bomb" today. Did you make it out?
It was really nice, the weather was perfect except for the wind (felt a little sand blasted in the pit)...

Sore as today, but that's a good thing..
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Old 02-15-2016, 03:59 PM   #11
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I put a JD jet kit in my CR125
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Old 02-15-2016, 08:34 PM   #12
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just run a gallon of motorex at 40.1 .put a new plug in first. Try it at Rio. Chances are you are going to spend a lot more time on the pipe there than you ever will at the forest. Ride couple laps and see how the spark plug looks. If you don't like it put a few drops of premix in the tank and top it off with the 32.1 and start buying spark plugs in bulk.
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Old 02-16-2016, 12:42 PM   #13
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It was really nice, the weather was perfect except for the wind (felt a little sand blasted in the pit)...

Sore as today, but that's a good thing..
Sweet, glad y'all decided to get back out to the track! We went for a little bit yesterday and it was really dry and a little rough (good practice, lol). Wednesday night should be amazing as usual when Vernon puts his magic on the night track.

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I put a JD jet kit in my CR125
Soooooo you just rejected the carb? Exactly what you should do instead of changing your oil mixture.

Last edited by 40acres; 02-16-2016 at 12:46 PM.
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Old 02-16-2016, 12:49 PM   #14
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Quote:
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just run a gallon of motorex at 40.1 .put a new plug in first. Try it at Rio. Chances are you are going to spend a lot more time on the pipe there than you ever will at the forest. Ride couple laps and see how the spark plug looks. If you don't like it put a few drops of premix in the tank and top it off with the 32.1 and start buying spark plugs in bulk.

Please stop giving bad advice. This is the wrong way to go about it. Your plug doesn't give you the entire story. If 32:1 is too much oil then your jetting is off or you have a bad crank seal.
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Old 02-16-2016, 02:23 PM   #15
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Not too well versed in dirt bikes but I am very in two smoke CR motors, you should not change oil mix ratios to lean or richen your motor. You should really not ever have to change the mix. If you do, adding oil will LEAN the air fuel mix so be careful with that. Mains and needles is the only proper way to adjust a/f mix. The oil mix just lubes the motor.
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Old 02-16-2016, 03:26 PM   #16
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Sweet, glad y'all decided to get back out to the track! We went for a little bit yesterday and it was really dry and a little rough (good practice, lol). Wednesday night should be amazing as usual when Vernon puts his magic on the night track.

Soooooo you just rejected the carb? Exactly what you should do instead of changing your oil mixture.
The night track looked like concrete, I stayed away from it. Can't hit Wednesday nights until the time changes, not enough daylight to get out there after work...

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Please stop giving bad advice. This is the wrong way to go about it. Your plug doesn't give you the entire story. If 32:1 is too much oil then your jetting is off or you have a bad crank seal.
Keeping at 32:1, it was fine at the track, just going to need to keep it high enough for the times we hit the forest. Looks like we are back at the tracks full time now.
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Old 02-16-2016, 03:29 PM   #17
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Yeah the night track always looks like unless it's Wednesday. The quads REALLY polish it up nice, lol.
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Old 02-16-2016, 03:36 PM   #18
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Not too well versed in dirt bikes but I am very in two smoke CR motors, you should not change oil mix ratios to lean or richen your motor. You should really not ever have to change the mix. If you do, adding oil will LEAN the air fuel mix so be careful with that. Mains and needles is the only proper way to adjust a/f mix. The oil mix just lubes the motor.
This is the case for every single 2-stroke motor. Run the correct mix specified by the manufacturer and adjust jetting to accommodate based on riding conditions, temperature and altitude. No shortcuts, exactly that.
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Old 02-17-2016, 08:34 AM   #19
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Soooooo you just rejected the carb? Exactly what you should do instead of changing your oil mixture.
Huh?

I just changed the jetting so it wasn't so rich. Been running great for the last 20 hrs. Still running the Honda recommended 32:1 ratio.
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Old 02-17-2016, 09:10 AM   #20
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Huh?

I just changed the jetting so it wasn't so rich. Been running great for the last 20 hrs. Still running the Honda recommended 32:1 ratio.
Rejected is probably an autocorrect from rejetted.
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