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Old 06-28-2012, 03:26 PM   #1
That_Boy_J
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Got a question about Gas for a 125cc

I am about to buy a Kawasaki KX 125cc 2 stroke from my uncle and so far what i know is that it is bored over. He uses C12 gas and the previous owner did aswell. I am going to find out how big of a bore and what type of piston was put in but my question is:

Do i have to use C12 gas or can i get 93 octane with the mix?

Thanks for any help or advice!
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Old 06-28-2012, 03:28 PM   #2
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My buddy and I both use 93

But if previous owners have used c12, might as well keep it up with that...
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Old 06-28-2012, 03:29 PM   #3
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Depending on what engine work was done, it may not run right on lower octane gas.
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Old 06-28-2012, 03:38 PM   #4
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Do you think C12 would clog the carb up as bad as regular gas if its been sitting long?
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Old 06-28-2012, 03:51 PM   #5
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Without a compression test, its nearly impossible to give you an accurate answer. Test compression and report back please...
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Old 06-28-2012, 05:52 PM   #6
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Quote:
Originally Posted by jetcycles View Post
Without a compression test, its nearly impossible to give you an accurate answer. Test compression and report back please...
This and it's going to be jetted to run c12, so If it's not a high comp motor you would most likely still need to rejet the carb to run 93.
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Old 06-29-2012, 08:00 AM   #7
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Thanks for the help and I will do a compression check. I do believe that it is jetted and high compression because the guy my uncle got it from decked it out and was serious about it. The guy used to race it in the Highlands i believe. Anyways i will check back in when i get the test done.
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Old 06-29-2012, 08:30 AM   #8
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I should add...If it was my bike, I would run the race gas until it was proven that I didn't need it. A 5 gallon jug should last you a little while, and should be far cheaper than a premature teardown due to top end damage.
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Old 06-29-2012, 08:39 AM   #9
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^^^ Thats very true!!!

Is there any local places other than Smiley's that sale C12 that anyone can recommend?
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Old 06-29-2012, 08:52 AM   #10
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^^^ Thats very true!!!

Is there any local places other than Smiley's that sale C12 that anyone can recommend?
I don't know your exact location other than NW so its hard to say. Call your closest cycle shop and ask about fuel...if they say no, ask who does have what you need. I would suggest calling the MX track as well, they should know.
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Old 06-29-2012, 10:20 AM   #11
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check with Motorcycles Unlimited, I got my "race gas" from them.
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Old 06-30-2012, 04:53 PM   #12
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Cut to the chase and just call VP. They do have a list of suppliers who sell their product. Someone will be close to you.
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