Carlos,
You MUST use the spec engine.  It's too late to order an engine
through the B&S sponsorship (although it doesn't hurt to ask).  You
may have to order an engine through a dealer (lawnmower shop or
perhaps a distributor will sell to you).
RPM limit this year is 3800.
And I'm the wrong guy to ask about centrifugal clutches.  Good luck -
will we see you at the Mini Baja 100?
-- 
Kevin Edwards
Mechanical Engineer
University of South Florida
kevindedwards@gmail.com
(813) 842-6030
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