Maintenance & Technical > KX500 Original

MONUMENT TO THE 2-STROKE 2000 KX500

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delphipro5:

--- Quote from: snoopjonnyjon on November 30, 2010, 01:31:16 AM ---You can buy VP fuel from most race shops, but it is expensive. Last year when I was burning VP I frequently burned through $100 or more in a day of riding. This year I switched to just running 100LL av gas. I have no idea how the availability would be in your area, but if you have a pilot buddy, it might be an option.

Here is an octane booster that actually sounds very promising:
http://torcoracefuel.net/pro-accelerator.html
Most of the typical service station octane boosts don't do much. I've never tried the Torco Accelerator but have read some independent reviews that say it really does work. Just don't mix it with the fuel ahead of time. It has an extremely short life when mixed. Only mix up what you will burn that day. Apparently after as little as 24hrs, the higher octane component has evaporated out and you are back to the same octane you started with.

Belray H1R is a two stroke oil, not a fuel. It will be available from every motorcycle shop.

And just in case you didn't come across it in your searches, here is my rebuild from last winter. I did a lot of the things you are looking to do.

I didn't do anything to the suspension other than new fluid and fork seals. I didn't consider myself to ride at a high enough level really benefit from big suspension mods. I thought it would just be wasted on me with my ability. But then I bought a Gasgas with Ohlins at both ends, and wow... I can't believe how plush and nice handling that bike is. If I had money to burn, I would try to get a set of Ohlins forks and shock for my KX.
http://www.kxriders.com/forums/index.php/topic,7066.0.html

--- End quote ---

O.K. Egg on me, I thought he was talking about a mix of pump gas(93) and some type of racing fuel(belray h1r)! I have never used belray anything, have ran golden spectro my entire life and never had a problem. I just think 91 is too low and I want to find a mix I could use.
As far as the susp. mods, once you have sat on a bike properly set up for you with top line susp. components there is NO going back!

delphipro5:
What is 100LL exactly? I know it is aviation fuel, but what does 100LL mean? how would I run it, just regular mix 32-1? could I cut pump gas with it? I have a lot of fairly small airports around me, maybe I could get it there somehow.

don46:

--- Quote from: delphipro5 on November 29, 2010, 01:25:29 PM ---ALSO, What makes this bikes suspension so archaich? it's got a linkage shock(some KTM's still don't)?
and are the forks really that much different to now?(aside from the sff models)
WHY can't you just buy a brand new shock and forks 2010 tech, in the same sizes as the stocks and replace them?(trust me I know the cost involved with doing something like that!), BUT I have not even seen it as an option, i'm just saying......... I mean, that is basically the idea behind the AF and SF mod's is to update the erginomics and suspension but keep the power.
I'm just asking what makes this suspension so outdated?

No I am not going magura anymore.

let's see anything else.-nope

--- End quote ---

changes are made to improve action on both the forks and shock, and I'm sure there are many that will debate this issue and thats fine. You could buy some Ohlins stuff, but that would be very pricey. as an alternative you could use a newer shock, however the newer shock is longer than the stocker so you could swap the clevis or mod the newer shock clevis, I've done it both ways and they work equally well. the forks are another story, you can buy newer forks with the triples and swap them easy enough, however the neck on lets say a newer 450 is at a different angle and so if you were to use them, your rake would be greater, the way around this is to have a set of triples made for the 500 with the larger tube size, I think sombody looked into this and it was about $900, so yeah you can do it the question is at what cost.

alward25:

--- Quote from: delphipro5 on December 01, 2010, 01:40:38 PM ---What is 100LL exactly? I know it is aviation fuel, but what does 100LL mean? how would I run it, just regular mix 32-1? could I cut pump gas with it? I have a lot of fairly small airports around me, maybe I could get it there somehow.

--- End quote ---
100 octane low lead.  It also keeps longer than pump gas since it does not have any ethynol in it. You could cut it, I would run it straight.

flyingfitz:
Alward,

Do you run 100LL?  If so, what oil in what mixture? I am assuming that that the additives dont harm the fuel system??

Fitz

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