Maintenance & Technical > KX500 Original
What 2-Stroke oil do you use?
KXcam22:
Maddoggy,
I used to use Avgas(100/120) mixed 50/50 with unleaded regular in the old days when race gas was not available. I also had a cheap source and got it in 45 gal drums. It worked very well and gave a large increase in throttle response - not sure how much true hp it added. Now days there is so much excellent race gas available that I doubt using avgas in any form is worth it. A can of VP likely works better and is cheaper. I'm lucky since I get 94 at my local pump so my KX never sees race gas. Maybe it should! Cam.
maddoggy:
hey thanks stewart and cam, i will be looking into the vp fuel. i'm taking a trip to st. anthony id. in june or july and would love the extra boost. any extra horsepower is great in the sand. MADDOGGY
FuriouSly:
--- Quote ---i run bel-ray mc-1 @ 50:1 with the best fuel i can get my hands on (premium). i'd hate to run much more oil than that for fear of gunking up the power valve....maddoggy
--- End quote ---
You know 50:1 is -more oil to fuel- than 85:1? Just checking, no need to answer.
As far as St. Anthony Dunes, Idaho. You will be up around 5000 feet which means less power. June is good and July is hotter, less power also. If you have higher comp or have done some other engine mods you will notice a significant loss of power. Make sure to take some jets with you and also move the clip on the needle all the way to the top for crisper throttle response off idle (needle seating all the way in the needle jet). Main jet should go down around 10-12 pts from where you are if you are around 1000 feet now. I would also suggest mixing 50/50 with some leaded race gas (c-12) to get around 100 octane, you will be amazed, but may just get you back to normal feeling at 5000 feet.
Alot of the real riders up there on ATV 450's and 500's run nitrous foggers to make up for the loss of O2.
Sly
Hillclimb#42:
I alway use Super Techniplate oil and at a ratio of 44:1. 32:1 always fouled plugs on cold starts for some reason. I would be leary of straight VP gas. Alot of guys are using race fuels and really lean mixtures. Their bikes smell great , but need tuned more often. Don't forget these guys are rebuilding every month, not going for longevity. You would need to re-jet and, flush tank and re-tune. I mix Premium pump gas and Turbo blue in a 1 part race fuel to 2 parts pump gas mix (Still 44:1) for the rare occasion I want to change things up. I think its important to keep fuel types and ratios the same, for the sake of less tuning issues, and longer life of the piston and cylinder.
Good Luck and have fun out there.
maddoggy:
sly, but of course the 85:1 would be more fuel to oil. however i just can't bring myself to lean out the mixture more than 50:1. i just don't like burning down a piston. i also live @ around 4000 ft already and won't notice alot of change in performance there. a little due to heat and slight altitude change but not much. i will take a tuning kit so i can correct any issues that i may experience. went there last year on 4 wheels but the k5 this year should be awesome. :-P. i may use some 100 oct. vp fuel available at rexburg motorsports close to st. anthony's. $50.00 per 5 gal. so i'll have to sneek that one past the boss er...um...i mean my wife.
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