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Bigsi15
Sunday 17th June 2018, 10:22
Hi all

So how long do you go between replacing spark plugs? I run genuine plugs on a nearly stage 2 tuned 850 which generally get driven like an old person but they have been in there a couple of years maybe 30k miles. Don’t really want to replace them unless needed! Do they give any signs when they are old??

Thanks!