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One way: Make sure your quad is not running, take off the sparkplug and pour in about 1/2 cup of boring sand (basically play pit sand) and put sparkplug back in, then start your quad for 10 minutes and it will turn off when it is done. Then remove the head and clean off the sand and put in the new piston. Another way to do this right: Get a drill and half inch drill bit. first drill a hole from the outside where the cooling fins are all the way through to the cylinder, drill at least 3 holes so that the cooling oil from the boring process can escape, then take it to a machinist to bore it out and also he can laugh at you. Plug holes with bubble gum and semen.

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11y ago
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Q: How do you bore a Yamaha warrior?
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