The stock axle is another weak link on the Spiderbox and WILL fail-also it's WAY too narrow.The stock spiderbox sprocket is very stout. After breaking 2 stock axles,bending 2 of the HD axles from a non-sponsored vendor and one I had custom machined, I salvaged the 1-1/4" hex axle & components from my trashed JEHM BX-125 kart.The hex axle is 6" wider,a lot stronger and allowed me to position the sprocket and disk rotor anywhere by using spacers. You can see my axle set-up -http://buggymasters.com/forum/showthread.php?t=1159
I made my own swingarm even though my wife's kart is still using the Howhit- I made it generic so I can put something larger on it in the future!!
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