replaced the plugs today - wow

[GMbusa]

I use the butt dyno. I'm not talking a drastic difference in power. My bike feels slightly better, it starts up better, the off idle response is improved. It's more of a drivability thing.

 

[Mr Bogus]

I use the butt dyno. I'm not talking a drastic difference in power. My bike feels slightly better, it starts up better, the off idle response is improved. It's more of a drivability thing.

this is where the fuel mileage decrease comes from on tired plugs.. Usually hard starts and a drop in fuel mileage are the keys.. funny WOT and peak power are rarely affected unless the plug goes completely out..(dead miss)