09-11-2014, 01:11 PM
(09-11-2014, 12:23 PM)furious_blue_imp Wrote:(09-11-2014, 12:22 AM)ClassicVW_imp Wrote: I agree. And I think they should be able to last a lot longer than the change interval listed. If my lowly Toyotas can have 100K mile plugs, why not a premium Honda motorcycle?!
my guess: typical car engines probably run at lower rpms than motorcycles. That means the the plugs in the car fire less often per mile so that might mean that they last for 'more miles' for the same number of times being fired.
my guess: typical car engines probably run at lower rpms than motorcycles. That means the the plugs in the car fire less often per mile so that might mean that they last for 'more miles' for the same number of times being fired.
You are right. See post #26
Quote:My experience with plugs tells me that if the electrodes are in good condition and the insulators are not cracked (normally by heavy handed changing, but also by heat) then the plug is as good as new. A good quality plug (platinum) should last anywhere between 30000 to 60000 miles and iridiums up to 120000 miles. High performance (revving) motorcycle motors and heat intense motors (as in air cooled maybe) may reduce the life of platinum plugs to maybe 20000 miles. Race bikes, for obvious reasons, to much less. But the CB hardly fits into those categories. As for heat control, I guess that is one reason that Honda oil cooled the galleries adjacent to the plugs. Plug wear should first become apparent by the rounding off and then erosion of the tip of the centre electrode. I don't see any evidence of that on my 12000kms old plugs. Polish them up, wrap them in tissue, put them in a box and you could sell them as new.
Cheers