spark plug gap

[kwells]

Got new plugs...can anyone tell me what the correct gap is supposed to be...still waiting for the manual.

Kevin

[h2olawyer]

Hi Kevin -

The Haynes manual says the following - condensed but the pertinent stuff is here.

Your spark plug gap should be 0.024 - 0.028 in. or 0.6 - 0.7 mm.

Remember to put a little anti sieze compound carefully on the threads before you install them. (not in Haynes but have read it in several other places for spark plug install) ?Also, be sure to start the threads by hand to be sure they are not cross threading. ?Use your hands or fingers until they are finger tight then use the wrench to tighten them 1/4 turn.

Do not over tighten them. ?The heads are aluminum and can be damaged by cross threading or over tightening the plugs.

May be basic info but better safe than sorry.

H2o

[kwells]

Hey Thanks...I actually gapped them at .29....which was what the ones were that I pulled out....If still have backfire probs...I'll gap them closer...

DOn't worry about the basic info, it's always appreciated...I learned the hard way on a quad 4 motor on overtightening head bolts....

[gbranche]

The Yamaha manual has the following info in a box on page 2-9:

Standard spark plug:
  D8EA (NGK) or
  X24ES-U (NIPPON DENSO)

Spark plug gap:
  0.6~0.7 mm (0.024~0.028 in)

Spark plug tightening torque:
  20 Nm (2.0 m-kg, 14 ft-lb)


Greg

[Lucky]

here's a fool-proof way of preventing crossed plug threads:
slip a piece of fuel line a couple of inches long over the plug and use that to thread in the plugs. when your a few threads in, pull the fuel line off & finish with the plug socket. It's virtually impossable to cross thread them.

--Lucky