monty_trials Posted January 9, 2007 Report Share Posted January 9, 2007 Wondering what grade plug everyone uses, i have a 03 montesa and the manual says to use a 6, but in the past ive been using anything from a 6 to a 9? For some reason a 6 sounds a bit soft?????? Quote Link to comment Share on other sites More sharing options...
hughesy Posted January 9, 2007 Report Share Posted January 9, 2007 Monty Trials, the number applies to the heat rating of the plug. The best plug IMO is the Iridium BPR6EIX, these are available here; http://www.spark-plugs.co.uk/index.htm I've had excellent service from them in the past. Quote Link to comment Share on other sites More sharing options...
monty_trials Posted January 11, 2007 Author Report Share Posted January 11, 2007 I am a mechanic, lol i know about plugs, what I mean is that a grade 6 sounds a bit low I would of thought a 7/8 would be a better heat grade than a 6 Quote Link to comment Share on other sites More sharing options...
neil king Posted January 11, 2007 Report Share Posted January 11, 2007 The smaller number is a hotter plug. Quote Link to comment Share on other sites More sharing options...
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