Maintenance & Technical > KX500 Original

Knocking Noise?

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HULKSTER:
When I bought the 2003 KX500 he told me that the knocking noise was normal. He said he was told that the powervalve had something to do with it. I dunno.

I have had other KX owners tell me the same thing about thiers making the knocking noise.....


Is this normal?

Everything seems fine.....

When ya crack the throttle....everything sounds fine....

Paul:
Hmmm... the only noise I've ever had come from mine was due to detonation and that cleared up as soon as the fuel was over 95 octane like the manual recommends. OR, you can go the modded head route and run 'em on pump gas.

I have one thats modded and one thats on 100 octane all the time and neither make that noise.

HULKSTER:
What modded hear route? Enlighten me.

I don't think there is any race gas around here....I will check soon though....

Paul:
The inside of the head looks like it was formed around a nipple, the head modification smoothes the transition from the edge to the center where the sparkplug electrode is, this in turn drops the compression alittle and allows you turn run lower octane fuel

HULKSTER:
Thanks....

I'm gonna ask today about the race fuel. I was told yesterday that one place has it...

If they do...I can run that at like 50/50 mix with Super...

If they don't...who does these head mods?

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