« Reply #1 on: May 21, 2011, 10:50:45 am »
go to any automotive store and run what the manufactor calls for. I won two champonships on stock Briggs plugs and I might be a little harder on them than your son mayt be.
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VLMRA Singles Points Champion 2006
VLMRA Mini Champion 2007
VLMRA Sportsman Champion 2007
VLMRA Pro-X Champion 2008, 2009
ARMA Sportsman of the Year 2008
ARMA South East Region Mini 2009, 2010, 2011,2012
ARMA National Champion Mini 2009, 2010, 2011,2012, 2013
Maxton NC Model A Record Holder 118.54
VGMR 1932 Model A roadster world record 165.8