Maintenance & Technical > KX500 Original

Detonation and Octane boost

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ElliotG:
Hello all,

My 5 hunnie has some detonation going on, and am thinking about trying some higher octane fuel.

I haven't cracked the head open yet, my compression is just shy of 115, so detonation isn't related to high compression.
I am probably due for a new piston/ring.; I have a trip coming up for SandMountain, and don't have enough time to freshen up the top end (parts availablity).

I really don't want to purchase 6 dollar a gallon stuff, so am considering using tuolene or xylene, depending on what is available . I have seen this done for other applications, was just wondering if this might be harmful for a two stroke?

I am worried about running in the sand for extended rides, don't wan't to hurt the bike with too much detonation, so the octane boost is a temporary fix.

Thanks

mikesmith:
I wouldnt suggest using that stuff found in paint thinner,are you sure your jettings right?I would rather run my jetting a little fat (rich) and put up with the "blubbering" (how it runs)of the bike and not worry.

Kawadougie:
I would definitely replace the piston and de-carbon the head.  Also check your ignition timing.  For a quick fix you can use any commercially available octane booster.  I used to use them when I raced high compression 125's.  The only downside is that it will stain the inside of the tank an ugly brown color.

alan:
Here is a post on another site which talks about Octane Boost!

http://yz490.com/index.php?name=PNphpBB2&file=viewtopic&t=26&highlight=klotz&sid=3a79aaf81fbebcdcdfc9799ebae9de87

Klotz works great!

Alan

KXcam22:
I have had good luck with octane boost.  But....for riding in the sand I would definitely put a fatter main jet in.  The extra load is considerable in sand and you are better to be a tad on the rich side. Cam.

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