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Old 02-17-2013, 12:19 PM   #1
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fuel mixture....

ok, 2smoke guys... i bought a cr85 for a project down the road... in the mean time it is all set up for tmgp and i figure i might as well use it to add a class to what i ride now...i know nothing about 2 strokes....i was all set to mix some fuel and realized at that moment that i do not know what the proper fuel ratio is...
so what is the proper ratio of oil to gas?
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Old 02-17-2013, 12:26 PM   #2
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32:1
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Old 02-17-2013, 12:28 PM   #3
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thanks...i checked on google and that is what most of the posts it referenced suggest too.
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Old 02-20-2013, 03:07 PM   #4
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Thats a safe mixure but it also depends on your jetting. is it a stock carb with stock jets? I would never run it any leaner then that. Just play with it. Buy good 2 cycle oil dont use weed eater . I use motul. its $20/ quart. That shoukd last a while these small engines use little gas. Mix small amounts of fuel at a time so you can play with the mixture without wasting.
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Old 02-20-2013, 03:12 PM   #5
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anywhere from 32:1 to 40:1 when I was riding 2t. If you stay on the pipe, fouling plugs shouldn't be an issue.
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Old 02-20-2013, 03:12 PM   #6
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32:1 - 36:1 would be great for that bike.

I've ran 40:1 in my old CR80 for a while with no issues but it's always better to be safe than sorry.
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Old 02-20-2013, 03:17 PM   #7
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Steve jetted mine for 28:1. This sounds like alot but it also has to do with your jet sizes. I get no drool out of the pipe at all and the bike makes great power. No plug fouling either.
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Old 02-20-2013, 03:19 PM   #8
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Quote:
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Steve jetted mine for 28:1. This sounds like alot but it also has to do with your jet sizes. I get no drool out of the pipe at all and the bike makes great power. No plug fouling either.
I can see running a very lean carb as justifying a 28:1 ratio. I'd bet Obed's carb hasn't been touched, though.
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Old 02-20-2013, 03:25 PM   #9
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True for stock jetting id say 32:1 ish is good.
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Old 02-20-2013, 03:49 PM   #10
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I heard from the previous owner and he ran 32:1, so that is where i will start.
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Old 02-20-2013, 04:27 PM   #11
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Mike are you bringing it out on Sunday??
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Old 02-20-2013, 04:51 PM   #12
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http://www.3wheelerworld.com/archive...p/t-53212.html

Good read.
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Old 02-20-2013, 05:10 PM   #13
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I am pretty sure Obed should be trying to run it as rich as possible, especialy since he is road racing the bike.
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Old 02-20-2013, 05:19 PM   #14
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Quote:
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I am pretty sure Obed should be trying to run it as rich as possible, especialy since he is road racing the bike.
Good point. 32:1 with a quality premix sounds like the ticket.
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Old 02-20-2013, 10:30 PM   #15
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It is usually 32:1. But if you use high quality racing/synthetic oil, you can use less oil. Keep in mind, if you change the ratio, you might have to change the jetting..
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Old 02-21-2013, 09:18 AM   #16
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The old rule of thumb for making the most power when jetting a two stroke you are racing was to lean out the mixture till the motor seizes then back off a little bit. Seeing how seizing the motor ruins it, might just wanna run a lil on the rich side.

That 85 is going to be eye opening on the track im sure. heh
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Old 02-21-2013, 09:33 AM   #17
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Keep in mind what it means to be leaner/richer.

32:1 is richer than 24:1.. just like 20:1 is leaner than 40:1.

Lean/rich refers to fuel in the mixture, not oil. If you are jetted for 32:1 and run 20:1 because you "want to be on the safe side" and have more oil in the mix, you will be running lean, and thus hotter, and could face over-heating issues and the like.

If you lean out the mixture by running more oil, you will need to fatten up jetting to account for the smaller amount of fuel in the mix so more fuel is consumed.
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