Rusty30

Stick with the NGK's. Your experimenation with plugs can and has caused engine seizure and piston melt downs. It isn't worth the risk. You won't know you have a problem until it's too late. If you can't buy the NGK's locally then get them online.  We're talking thousands of dollars in damage. Just isn't worth the risk.

AS INDICATED STAY WITH NGK.  BE CAREFUL GETTING THEM ONLINE OR FROM AUTO PARTS STORE. ONLINE COULD GET YOU COUNTERFIT ONES AND AUTO PART STORE MAKE SURE TOP UNSCREWS.

BEST BET IS TO CALL LOCKWOD AVIATION IN FLORIDA THEY HAVE CORRECT ONE FOR YOUR ENGINE AND THEY ARE ACTUAL NGK. 

NOW IF YOU HAVE FUEL INJECTION ROTAX THEY MAY RECOMAND I BELIEVE DENSO BUT YOU ALSO NEED NEW CAPS. CALL LOCKWOOD AVIATION IN SEBRING FLORIDA BEST IN THE WORLD FOR ROTAX PARTS RECOMENDATION. THEIR NUMBER IS ONLINE.

SOME HAVE BOUGHT THROUGH AMAZON OR EBAY AND THEY HAVE TURNED OUT TO BE FAKE NGK BE CAREFUL, JUST MY OPINION. PAY A LITTLE EXTRA AND GET THE CORRECT ONES AS INDICATED BY LAST WRITER.

http://www.ngk-sparkplugs.jp/english/techinfo/fake/index.html

That's Roger I think it's the right way to go with the spark plugs, In fact I was looking for a long life spark plugs to suit the 912s

Thank you for your input,I'm talking all that on board,thanks for the spare parts promo it will come handy.