Small Engines (Lawn Mowers, etc.): connecting rod, hp briggs, vertical shaft

Question
i am wanting to build a racing lawnmower and would like to know what all i would have to do to my 12.5 hp briggs vertical shaft riding mower engine to  make it strong enough to withstand higher rpm's from adjusting governor. would a stronger connecting rod suffice? what difference would a lightened flywheel make rpm wise? thanks for any help!

Answer
Hello Gary:

It has been 20 Years Since I have Specifically BUILT a Mower or Chainsaw Engine for Racing. For More Up To Date Assistance, Please Try this Site Addy; http://golawnmowerracing.com/ . If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.

Respectfully

John