daverclasper Posted August 28, 2018 Report Share Posted August 28, 2018 Hi. At cruising speed 3000 revs, when doing a plug chop, mine are a mid grey colour (rather than brown). I have read that this is ok with modern fuel?. Any help, great. Thanks, Dave Link to comment Share on other sites More sharing options...
NonMember Posted August 28, 2018 Report Share Posted August 28, 2018 I believe that is expected. The brown colour was down to lead compounds in the mix (lead oxide is brick red) so removing the lead leaves a grey colour. Link to comment Share on other sites More sharing options...
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