Seal kit

Hell, that's easy!...There are various seal kits on the market. A google search or Ebay search will easily find them.
However...

My favorite seals to use are the "Factory OEM Yamaha" seals.

There are nothing like factory original parts!

You can get them (link below) here along with other things you know you want, such as porting, head re-chambering, machine work, other parts for you build, etc

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http://www.kenoconnorracing.com/

Or... go directly to the "Blaster parts section" here \/ \/ \/
http://www.kenoconnorracing.com/OEM Blaster Parts.html