If it comes down to doing a insert name brand being a Time-Sert like nick said I would say would want someone with some past experience to do this or help you with it. Here is a link to the Time-Sert site. The head WILL need to be removed to do this.

http://www.timesert.com/html/sparkplug.html

xtreamedrtbker;224313 wrote:
Well I'm pretty sure that the plug for that bike is a NGK-CR8E and it has a 10mm thread with a 16mm reach, so if only a few threads are damaged you have nothing to worry about as long as you can get the plug started and not cross threaded. As for repairing it you would want to do an insert on it and not a helicoil on a spark plug thread because of the fact that you will be removing and installing the plug and a helicoil will not stand up to that over time. I would do whatever you have to to avoid having to insert in though, because once you do that to a head you run a chance of cracking from the spark plug hole to a valve seat. (I’ve seen it several times on older Harley castings) Try a thread chaser first like black2g said and see if you can get the threads straitened out. I saw that goodnbuzzd said to use anti-cease and that really is not as good as an Idea as it sounds… This is because if you put anti-cease on the plug every time you replace the plugs you will build up a lot on the treads of the head and gall the threads in a aluminum head. (I’ve also seen this a lot on Harley heads, cause people think that it needs it every time they put plugs in it.) The right stuff to use is clean motor oil on the threads, just a drop. Look in many manuals and this is what you will see. If you pull the head off you will need to pull the cylinder off also because you would have released the clamp load on the base gasket and it will need to be replaced then.

That's the thing, I can't get the plug started at the proper angle. So I would want to do an insert then? What's the technical term so I can buy the proper tool(s)?