I m rebuilding the top end on my 1991 XP, It has the yellow motor in it. Currently its bored out .50mm. I plan on boring it to .75. I m not sure what is the best place to buy everything. I have seen a few things on ebay but I m always a little worried that I ll end up with junk. Any good rebuild kits out there that anyone would recomend? Also being that i have the top end ripped apart is there any thing I should do to the bottm end? Any recomendations would be greatly apperciated.