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this is how I built catch can into frame on my YZ - similar should work on KX or most frame designs -

drilled 3 small holes into top of lower frame cross member-

milled a aluminum plate with a channel in it to allow fuel to flow freely - drilled holes in channel and used rivets as hose nipples -
JB welded nipples in place-let dry-
one nipple has a small tube that fits inside the frame to lowest point to drain fuel -siphon action -

Bottom of plate is coated with JB weld and clamped on place till dry - works well -

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what are the notches in the crank for ??
 

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used to stuff crank holes and crank pin with cork and epoxy
to Up crank case compression -

it did work
 
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