2009 Phazer GT - spark plug blow out

[soo_smitty]

Anybody have this happen before? Was riding and the sled started running on one cylinder. Brought it home and took it apart and this is what I found.... bad news is that it also ripped the threads out of the head. Not sure how this happened - spark plug maybe got loose? I bought a helicoil for it - any tips? I haven't taken the head off yet, but was hoping I'm going to be able to do that without pulling the motor. I've also never taken apart a four stroke before - what do I need to watch for? I've already bought a head gasket, is there anything else I would need? I've read a few threads that mention possibly breaking head bolts on these when re-torquing them.

 

[maim]

helicoils can be put in without removing the head in most things. i would use a shop vac and a bore scope to make sure you get all the shavings you can from the tap out.

that plug looks like it vibrated loose as it was not tight enough. might still be threads at the bottom of the hole.

 

[soo_smitty]

helicoils can be put in without removing the head in most things. i would use a shop vac and a bore scope to make sure you get all the shavings you can from the tap out.

that plug looks like it vibrated loose as it was not tight enough. might still be threads at the bottom of the hole.

There's barely some threads at the bottom of the hole - enough for a tap to catch, but not enough for the spark plug to thread in

 

[blueironranger]

Good news it the plug looks fully intact, First time I've seen this on a Phazer (fixed a few 5.4L fords!) If it was my sled I'd pull the head to make sure everything looks good, and port it!

 

[ATV PRO #11]

Ouch. Never seen this before.