Iridium plugs arrived

I fitted the Iridium plugs today, again following the excellent guide provided here by JeffR. Although I have a workshop manual, it's much easier to follow Jeff's directions. 2 points to mention..........
1) The tickover went up by 400rpm with the new plugs. The bike was running fine before I changed plugs and the old ones I removed looked to be in good condition, so I wonder why the rpm increase? I've never used Iridium plugs before but I thought they were just longer lasting rather than better performing? Anyway, I adjusted the tickover back to 1300rpm.

2) In "JeffR's How to change plugs" the 2 screws holding the inspection flap on are replaced by 2 tiny plastic trim clips on my 2001. I've added a note to that effect below Jeff's instructions.

Ian

x

The thing I notice with iridium is I have to give it a little throttle to start the engine otherwise no rpm increase

Just installed 6 iridium spark plugs in my '03 4Runner. hee, hee, hee.

I was told the smaller electrode uses less voltage.

keithb wrote:

Just installed 6 iridium spark plugs in my '03 4Runner. hee, hee, hee.

My little 4 cylinder Ranger has 8 of them, 2 per cylinder, how inefficient is THAT engine! The guy at the parts store scanned 1, and only charged me for 1. 7 free iridium plugs, WINNING!

+1 for Bigbird
I have had to reseat new plugs in bikes before especially the NGK iridium. So loosen the plugs a bit and re tighten to fully seat the sealing ring on the plug. I remember something in the sportbike forums about them having a bevel, or a round or something like that on them. I could be wrong about that, but i would swear ive heard of it being a issue before. Anyway, ive had to do it, so . . . . . .