Hi MattTDM!
The service manual states:
1) plugs - verify - clean and adequate distance from the electrodes to 10k, 30k - replace every 20k
2) Air Filter - Check and clean 10k, 30k - replace every 20k
I clean and check items 1 and 2, less often than recommended.
However the substitution is 20 to 20k.
The frequency of inspection and cleaning air filter, is intrinsic where you wheel
(only asphalt, dirt / dust?)
I wish you a pleasant journey.
Cheers!
Thanks for that info, generally I think if I am going to spend the time to remove the plugs, I would just replace them, given they are cheap and that the fuel tank needs to come off.