Originally Posted by dwoodward
OEM-quality spark plugs are cheap, and you may not be able to visibly detect functional issues. I once found one that would spark fine in open air, but not under compression at TDC.
Sort of like doing a timing belt on a car- most likely you have to muck with the water pump anyway, might as well replace it while you're there, and hey, crank main seals are cheap and you're right there- why would you not replace it?
I completely agree with this. I bought some Irridium plugs for my 955 but after 12K I hadn't noticed any difference in how the bike ran and I wasn't that confident about them going another 12K so I replaced them with new standard NGKs. For the sake of a £Tenner£ it just gives peace of mind.
2002 black Tiger955i, 72000 miles and counting.
2011 black Tiger800XC, The other British Land Rover. 40000 miles and counting.
2013 black Tiger800XC, The other British Land Rover. 500 miles and counting.