new piston install question

sooo i was reading the directions on the new wiseco piston i just got for my 220,and it tells how to mark and drill lube holes in the piston???do you guys do this?theres 4 small holes in the front of the piston already,2 to either side of the area they want you to mark and drill:bonk:

I go up a drill size and large chamfer after that, had too many failures in our early days across the exhaust bridge.

Only necessary if your bike has an exhaust bridge. The KDX does not.

Only necessary if your bike has an exhaust bridge. The KDX does not.

hahahaha juliend i dont even know what an exhaust bridge is:bonk:,but the KDX220 doesnt have one?so i dont have to drill extra holes in my shiny new piston?:busted:

No, no drilling required. Lots of 2t bikes have a narrow bridge in the cylinder wall that runs down the middle of the exhaust port. Yours does not. The extra holes are for a little extra cooling and lubrication of the exhaust bridge so it doesn't expand and tear up the piston and/or cylinder plating.

ahhh gotchya i ve seen those in cylinders never realized it was called a bridge

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