Fuel

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Apr 22, 2001
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#1
I just bought a used 2000 YZ426 and have a question.

The owners manual recommends using 95 octane unleaded gas or higher. I Live in the Dallas Fort Worth area and 93 octane is the highest I have seen.

Is this OK?

Will I experience knocking?

how much difference will a high octane racing fuel make and where might I find it?

Thanks
 

Boit

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Sep 5, 2000
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#2
I also have the '00 YZ426. From my personal experience and following Rich Rohrich's advice, I started using VP C-12 and took the time to jet the bike properly. The rewards have been nothing but extremely satisfying. C-12 typically calls for slightly leaner jetting than pump fuel. If you are willing to do the jetting, it's definitely worth it. Since it has turned to warmer temperatures outdoors, I'm running a #158 main jet and the engine totally rips! I'm using the stock pilot jet at 1 3/4 turns out. My engine never stumbles, hiccups, hesitates, or gets hard to start. Throttle response is phenomenal. :cool:
 

Boit

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#4
I used to pay $4.25 per gallon until my supplier sold out to another dealer. I'm paying around $5 a gallon now..GRRRR!
 
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#5
I was under the impression that you were not supposed to use race gas in the YZ-F's, something about the seals or bearings in the carb...
 
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#8
Originally posted by Boit
Carb bearings??
The Keihn FCR series uses bearings to locate the slide.
 
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#9
That was great steve, and Rich is as succinct as ever.:) I stand corrected, and a little smarter (not a hard accomplishment;) ).