Trouble Trouble Trouble

[DGXSER]

If they had a heli-coil installed, you may be able to reinstall one, using some good lock-tite with it and try that.

[jetmechmarty]

Motorcycle Classics covered stripped spark plugs in their magazine a while ago. Have a look.

Spark Plug Rethread

[rdmcguy]

Stripped plug

I had a similar problem with stripped plug awhile back.
I was away from the house when it let go!
All I heard was a pop and a loss of power.
I frequent a GREAT Yamaha shop here that repaired it on the bike.
I'm sure someone will frown at that but these guys are magicians.
True enthusiasts not a bunch of monkeys turning wrenches.
It doesn't hurt that I have done business there for 37 yrs.
Good luck

[IanDMacDonald]

Great post Marty!

[skids]

BZ- Plenty of time left to get that bike going! The head takes an hour to remove. As far as the thread repair, helicoil? Dunno. I never over-tighten my spark plugs just for that fear.

It isn''t just about over-tightening. The steel plugs and aluminum head are "dissimilar metals" which tend to cause something like a chemical weld. I use a little Never Sieze on the threads every time the plugs are reinstalled.

[BZ]

Motorcycle Classics covered stripped spark plugs in their magazine a while ago. Have a look.

Spark Plug Rethread

Thanks for the info! it worked the hole was in real bad shape the last coil they put in was not at the right angle so it was a huge pain to get it to a point were it will work. the next time there is an issue its going to involve replacing the head. but until then

ITS ALIVE!

[Ken Talbot]

It isn''t just about over-tightening. The steel plugs and aluminum head are "dissimilar metals" which tend to cause something like a chemical weld. I use a little Never Sieze on the threads every time the plugs are reinstalled.

Remember too that the crush washer on a sparkplug is an important part of preventing over-tightening. When you install a new plug, you hand tighten it to the contact point, then turn it just a half-turn more. Take that plug out, put it back in like when it was new, and that 'half turn' more crushes the washer more again. Do that a few times and there's not much 'crush' left in the washer. I'm not saying to replace the plug after "X" installs, but pay close attention when you're tightening that half-turn more on an experienced plug.

[WMarshy]

If you read the instructions on the box the pugs come in it will tell you IIRC 1/8 turn past seated once the plug has been installed previously. That is important.

[jetmechmarty]

A torque wrench is always a good option for plug installation. Using one at least a few times should give you a feel for it. On a pre-owned vehicle such as this one, there seems to be no shortage of fasteners installed by a gorilla (over torqued).