I use a tool from Kowa Seiki, it is a clutch hub nut socket for old honda atv four stroke crank shaft nut removal socket, it works great, K&L supply Co. sells the kit, the part number for the set is 35-9458.
Be real careful removing the compression valve, and make sure you grind the ping dents out, or it will ruin the treads when you screw the valve out !!!
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[This message has been edited by DesertDog (edited 04-20-2001).]