The bike is in great shape and ran perfectly. Looks like it came out of a showroom. I put about 4000 miles on it. Now the right side slowly dies at idle.
I can blip the throttle and it will hit - clear out the cylinder and run and will continue at road speed above 2500 RPM. Back at idle the cylinder misfires then dies and I smell unburnt fuel in the air. I'm thinking it is fouled a plug. I've tried every plug wrench I own - won't drop down over the plug?? It looks like a standard 5/8 socket should do it - but it doesn't. Is there a extra special wrench needed for this bike?? What am I missing - no manual for it - yet. Thanks for any help

 

It shows to us a D8EA NGK Plug check with the parts store and make sure its not a 9/16 or maybe like mine it sits to close for a thick wall to fit.

 

Thanks for the answer - I do have the owners manual and the correct plug is as you say D8EA NGK - I think you are right - all my sockets may have too thick a wall. I've got 5 5/8 plug sockets and all of them won't fit - they do drop into the hole and sit on top of the plug. I can feel them just barely catching. So it must be the points of the plug are too close to the wall of the hole the plug goes into. Does anyone know of a brand that will fit?? Perhaps I'll have to put a socket in a lathe and turn it down. Why would a manufacturer do something like this??

 

Good luck I am getting my old 750 Kaw back this week

 

it is a tight fit even on my 89 ZX7, but the standard 5/8 still made it in. However, I just hapen to have a D8EA sitting on my desk right now (parts store listed the wrong size for mine) But those plugs take an 18MM, not a 5/8. Good luck getting an 18 down there, let us know if you get the right size.

 

You can pick up dirt bike tool kits for a couple of bucks for the D8 plugs. They are longer than a standard socket with thin walls.

 

AHH! 18mm. I didn't know such a plug size existed. Thanks!! that would have really bugged me if I had turned down a 5/8 plug socket and it still didn't fit. This is why I like the net - so much good help!! Thanks to all

 

I got the 18mm deep well. It did drop into the spark plug well ok - but no go still. It appears that some "stuff" has been thrown up into those wells also preventing the socket from fitting. I had used an air blow off to clean the wells before trying to remove the plugs just to avoid any thing from falling into the cylinder when the plug comes out. Turns out the stuff was small gravel that was tightly wedged around the plugs - what a PITA to get out!!. Finally success the 18 mm is the correct size and the plugs looked crappy - so now it is off to get a new set. Thanks a bunch for the info folks!!

 

keep us posted joe!

 

Sweet, let us know how it runs.