I had some old couplers and made my own tool. I wanted the 80 dollar one but was tuff to pay that when the Yamaha tool looked the same and sold for 40 bucks.
I have yet to fix mine either. I plan on installing a sxr tunnel so wasn't really concerned with it. Ski doesn't hook the same even with the stuffer. I lost a nice worx mail loader intake grate. I will use 2 part epoxy when i put new inserts in.
if you pick up a x2 with a 750. look for a blaster limited chamber or a nynja c4. it will have all the bottom end grunt you want, you also want to make sure you run 2inch exhaust like said above. i've ran a mild ported sp 743cc 93sx (best low end port timing Kawasaki cylinder) with the cases...
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