Maintenance & Technical > KX500 Original

What gas do you run?

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teamgreen500:
My last "Mod-head" was in '91. It was done by Jon Stoodley, my first and best race mechanic! He "Bumped" my KDX up and "Bumped" my KX down on compression.

You can find him over at the Gas-Gas Trials Bike/U.S. site: www.gasgas.com (Go to right side of the homepage,"GasGas Guru...)He's the "Tech-Questions" guy over there!

Go ask him and have him do it. You won't find a better engine tuner. He treats every motor like a works motor.

Best of luck,

Manny

Robsauto:
Thanks for the info. Sharc I am amazed you don't ping on pump gas. You wont hear it ping if you ride mx, but in the desert, when it gets hot as in a long hi-speed sand wash, mine pinged no matter how i jetted it. Kawasaki sells 3 different head gaskets for the kx5, so i will try the thick one (1mm) and see if it will help.

Rick:
It's important to remember that the farther you are from sea level the lower Octane required.  For instance, in my Corvette, I have a 327 small block with 11.5:1 forged pistons.  At 4000 feet elevation, I can get away with 92 Octane Chevron.  However, when I take a little drive towards the coast, I'm  looking for Octane boost just so she'll idle.  I did try and use 85 Octane once, but had to siphon it out and add the good stuff, as it wouldn't even idle.

Same goes for the 500.  Higher elevation means the bike is less sensitive to Octane rating.  I used to run VP exclusively, riding and racing.  After several years, I switched to 92 Octane Chevron for the bike.  If we head for Southern California for a race at sea level (or close to sea level), we step up to VP one again.

Rick

John:
I seem to recall  :idea:  that the octane level is (relative to / indicative for) the point of self combustion. The higher number the less likely to self combust. The higher octane - the more you can compress the air / fuel mixture before it self combust. Pinging engines where everything is OK benefits from an octane boost (high compression setups).

This is something I remembered from school; maybe some aviation techie can correct me if I'm wrong?  :wink:

/John

HULKSTER:

--- Quote from: Sharc ---I run Premium anything gas in my 2002 and no pings...I'm a crazy old-school guy though - Golden Spectro at 50:1, any brand premium gas from any station thats open....havent fouled a plug, pinged, or fried a top end since the bike was new 4/02...the sweet K5 sucks it up and spits it out...!!

Sharc
--- End quote ---


Me too....me too....

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