you can not call ahead for a voucher, you have to get them at the voucher center in person. if you haul it in your truck you can usualy get a dune ready voucher, drive out to the dunes and unload and ride.
http://www.toomey.com/components/com_virtuemart/show_image_in_imgtag.php?filename=resized/Spark_Arrestor_3_4d60824a4ef89_150x150.jpg&newxsize=220&newysize=150&fileout=
why not run theese? they breath better.
a leak down test will tell you if or where those gaskets are leaking. don't use silicone it doesn't take fuel well. I use coppercoat spray on those gaskets or yamabond.
some people on ebay are scammers, keep doin what your doin, you have nothing but great feedback on here. looking to get one of the chariot coolheads soon.
put the case halves together empty and check the alignment of the holes for the bearings, to make sure they all line up, case halves are machined in pairs, but sometimes you get lucky. you may be ok if your lucky.
you will be happy, Jeff is great to deal with and does awsome work. I called him on a holiday weekend with jetting and timing questions and he was happy to help me.
I got my cyls back from him the weekend before an event, he told me to call him. to make sure everything was rite and help with tuning.