MAN. I want to jump in on this!!!!!! FIRST AND FOREMOST,,,, YAMAHA is in the MAKING MONEY BUSINESS,,, SECOND, If Yamaha has to pay $3.00 for EACH plug from its supplier, THATS 9.00 PER SLED... if they make 100,000 sleds, THATS $ 900,000.00 ALMOST A MILLION.... if Yamaha could save a MILLION DOLLARS A YEAR by putting the cheaper spark plugs in that motor without RISKING WARRANTY repairs,,, BELIEVE me,,, they would do it!!!!! Do you guys think that you are SMARTER than YAMAHA's engineers that figure this stuff out???????? NOT A CHANCE!!!!!!! The WARRANTY repairs on BURNING DOWN MOTORS all the time would almost put them out of business,,needless to say, NO ONE would buy the SRX!!!!!!!! IF YOURE SO WORRIED about SAVING a few bucks,,,, TAKE UP A CHEAPER HOBBY!!!!! NO,,, Its not a GOOD IDEA t o put in the WRONG spark plugs!!! In Fact , its downright STUPID!!!!! Why don't you just take out all the YAMALUBE and fill er up with 10w40?????? ITS CHEAPER AND ITS OIL!!!!!!! its like these IDIOTS BITChING about the GAS PRICES,,, HEY IDIOT,,, You are driving around probably the MOST VOLUMETRICALLY INEFFICIENT VEHICLE on this WHOLE PLANET... If you are worried about "saving gasoline" STAY ON THE COUCH!!!!!!! MOST OF US GUYS have a "loaf of bread" under BOTH ARMS and we are BitChinG about not having enough BUTTER!!!!!!!! Gary Oles nosboy