Maintenance & Technical > KX500 Original

I want more over rev

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jigggawatt:
I have a low hour 01 500 . I have a fmf gnarly pipe, reed spacer, procircuit 296 silencer. jetting is 168 main and 55 pilot. The bike starts , idles and runs well. I would like more rev. It signs offf pretty early and goes flat. I was thinking of a thicker head gasket . What do you think? I'm not new to 500's , but I've always had red ones. I rode a honda 500 in the Glen Helen 24 hour. I wish now it would've been a green bike , so much easier to ride. Do you think a thicker head gasket is what I'm looking for ?
                                               Thanks,Jim

Paul:
If you don't get an answer send Doordie a PM. He's got more KX500 secrets than Carter has liver pills.

gowen:

--- Quote from: jigggawatt on December 21, 2006, 01:25:05 AM ---I have a low hour 01 500 . I have a fmf gnarly pipe, reed spacer, procircuit 296 silencer. jetting is 168 main and 55 pilot. The bike starts , idles and runs well. I would like more rev. It signs offf pretty early and goes flat. I was thinking of a thicker head gasket . What do you think? I'm not new to 500's , but I've always had red ones. I rode a honda 500 in the Glen Helen 24 hour. I wish now it would've been a green bike , so much easier to ride. Do you think a thicker head gasket is what I'm looking for ?
                                               Thanks,Jim

--- End quote ---

Hi Jim,

I guess it depends on how much over-rev. You can get a thick gasket from Moose and will move more power up top. Also, lose the reed spacer and change it out for a Boyesen Rad Valve, which is excellent for more top-end range.

There are more pricey options too, like shaving the flywheel, or buying a PVL ignition. FMF makes a desert pipe, which moves the power more to the top.

doordie:
jigggawatt,easiest way is to lower the advance of ignition.
Take away flywheel and move ignitionplate counterclockwise to the last mark.

Raise cylinder makes more rpm and you get higher portimes and lose some bottom.
You have to shave head to avoid "pinging" when you do this.
1,5-1,7mm is safe squish(head to piston at edge).
Use search and type squish... :wink:

jigggawatt:
Thanks I'll give it a try

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