Kawasaki Concours Forum

The C10, aka Kawasaki Concours - The Original => The Bike - C10 => Topic started by: Noho Drewster on May 31, 2011, 06:03:17 AM

Title: spark plug thread size??
Post by: Noho Drewster on May 31, 2011, 06:03:17 AM
Bought a $20 compression tester from Harbor Freight and the 12 mm adapter almost stripped out #4 plug.  Anyone know what the tread size is, or where I can find an adapter??
Thanks, Drew
Title: Re: spark plug thread size??
Post by: T Cro ® on May 31, 2011, 07:04:23 AM
14 mm thread and the pitch I think is 1.25 pitch.
Title: Re: spark plug thread size??
Post by: Noho Drewster on May 31, 2011, 03:03:34 PM
OK, Thanks Tony!!
Title: Re: spark plug thread size??
Post by: Noho Drewster on June 15, 2011, 04:04:36 PM
Just an FYI Tony,
the plugs are 12mm.
Drew
Title: Re: spark plug thread size??
Post by: Mettler1 on June 15, 2011, 05:13:22 PM
Quote from: Noho Drewster on June 15, 2011, 04:04:36 PM
Just an FYI Tony,
the plugs are 12mm.
Drew
  Funny. I thought so too but I would NEVER question Tony. He knows everything!!! :yikes: ;D ;D
Title: Re: spark plug thread size??
Post by: T Cro ® on June 16, 2011, 05:42:02 AM
Quote from: Mettler1 on June 15, 2011, 05:13:22 PM
  Funny. I thought so too but I would NEVER question Tony. He knows everything!!! :yikes: ;D ;D

NOPE .... I make mistakes too.... Funny thing is I double checked across a chart and I'm fairly sure the chart is correct so I can only blame my old eyes and being eager to post an answer. Must have crossed my B's & D's
Title: Re: spark plug thread size??
Post by: Dan on June 17, 2011, 10:41:56 AM
Do u guys run ngks?
Since I am trying my first valve adjustment, figure I will put in new plugs as well....

Dan
Title: Re: spark plug thread size??
Post by: gtr1000 on June 17, 2011, 12:09:24 PM
Quote from: Dan on June 17, 2011, 10:41:56 AM
Do u guys run ngks?
Since I am trying my first valve adjustment, figure I will put in new plugs as well....

Dan

Yep, Iridiums at the moment and before that, standard NGKs. Never rated Champion or Nippon Denso but have occasionally used Bosch.
Title: Re: spark plug thread size??
Post by: Jet86 on June 17, 2011, 02:50:45 PM
Over the last few months my bike was getting harder to start and once it was running and going down the road it was good but if i turned it off to run in the store and come out 15min later it did not want to start until a big backfire out the right tailpipe, i thought it was my carb's cause i know they need cleaning but after adjusting my valves and putting in a new set of NGK D8EA this girl woke up, she now starts Immediately, there was only 2 valves outta spec so i don't think that was causing the backfire, now i know what to do when she gets hard to start or backfires.