H-D Spark Plug Warning

[Big MAK]

Did a leakdown and compression test on a buddies bike today since we thought there was a problem.

Compression and leakdown were good.

He went to put the plug back in and it broke in two. Had a leak from the plug! The H-D (Champion) plug was in two pieces and barely holding together - it would have blown out of the head soon. Where it broke off you could see it had been blowing gases out. It was definitely not over-torqued.

So we checked the other H-D plug... the electrode was atleast 1mm off center - burning HOT on the close side and cold on the other.

So that was a lesson learned for the day - compression leak from a spark plug was a new one for me.

ANYWAYS... if you've put in H-D (Champion) plugs recently may want to pull and check them. Getting 2 bad ones at once seems really weird I'm thinking there's a bad batch out there.

[vafatboy]

Thanks for the heads up, I've heard of plugs leaking at the insulator, but never saw one personally.

[Fe Butte]

I run the ones for v rods is one step colder. That way the dealer won't freak when they see denso irrdium ones in there

Sent via FM (fookin' magic) it's all FM ain't it?