Head case!!!!!!!!!!

GPZ coming along nice, most of the paint done, bit of polishing done to ally bits, wheels on, brakes on, engine painted and in, spagetie wiring nearly done, stainless 4 into 1 exhaust on, carbs in place, then last night while removing old spark plus for new, out came no3 plug along with thread from the head, a loud cry of fek must have been heard by half the village,,, anyone got any ideas,,,,, don't really want to take head off, seen these inserts on utube that can be done in situ, anyone done it or am I pishing in the wind......

might be possible to use thread lock on the insert, i would keep the plug out though till its set . i would have thought you must make sure its fully in so the plug goes down properly & seals. don't over tighten.

you should be able to helicoil the head in situ.

the mechanical side of our workshop have done this but i dont know the ins and out of it myself.

your local machine mart will do the helicoil kits.

i'd rather someone else confirm all this before you attempt it though.

In theory it can be done in situ with a helicoil. There are two problems that spring to mind.
1. Will the drill bit fit in your hand drill and make sure you are perpendicular to the plug hole ie perfectly in line.
2. Getting the swarf out of the cylinder and also the tag end of the helicoil.

In the past I have used a plastic hose that will fit down the plug hole connected to a powerful workshop vac.
Then I checked the cylinder with a bore scope to make sure there are not bits left.

Oh you will also need an extended tap wrench.

Hope this help and good luck.

Don't know if this will help? As Mig said, biggest problem is getting the swarf out of the bore and checking it's clean afterwards.

http://www.machinemart.co.uk/shop/product/details/armstrong-eco-kit-spark-plug-thread-repair-kit-3

Personally I'd bite the bullet and pull the head off mate, better in the long run than wrecking the motor with metal filings in the oil!

I have sent off for a kit that claims to be easy to use and a permanent repair, going to try it with the head on, plenty of grease on the taper reamer to collect swarf and a good hoovering via a tube through plug hole, run motor with no3 plug out for a min or 2 should blow the rest out, maybe a petrol wash too,,,,, will let everyone know if it is as good as it says,,,,,

Good luck, I'll keep me fingers crossed for you!