if that's the case and you have enough good threads at the top to seat a plug nice and square, you could chase it out - if the threads are a little bent the tool will move them back into place. I would mark this plug with a paint pen though to remind you to be super careful in the future.

your call - if you feel the plug is in enough to hold, and there's no leakage, you might just leave it as is - add another washer or two maybe so it bottoms down firmly - you want the plug to go down easily until the washer hits the top of the head, then tighten it a quarter turn.

If there's ANY leakage - it will flame-cut the head and your problems will get much worse.

 

the tool to chase it spark plug threads is coming today hopefully it gets the job done.

 

I'm worried that lower threads are actually good ones and upper ones are crooked. Plug just happens to go in easily because it was forced in after tester and has formed new angled threads. Then when plug encountres original threads 1/2-way down, it doesn't match and gets tighter.

Put plug in 1/2 way until it gets difficult. Take photo from top with lens centred over hole. Print out photo and measure distance between corners of plug hex to outer-wall of plug-hole. Are they exactly same all way around?

 

you always save me I got the chaser tool today but didn’t end up doing it today.I’ll do that tomorrow.

 

looks straight to me I don't have a printer.I will be comparing it to another cylinder and seeing.Let me know your thoughts.
https://imgur.com/a/MIghYFU
here’s a video from different angle

 

Sure, looks good!

 

dude - be VERY careful when you chase out those threads - use lots of grease to capture any shavings, make sure you have the piston down in the bore so you don't ding the top of it, and get it in straight - this is a one-time deal, bugger it up and you're looking at having an insert fitted. Once you're done, turn the engine over a few times to blow any shavings out before you install the plug.

 

I shouldn’t have the piston tdc I was told i should.Also curious what would happen if you dinged the piston.

 

ding the piston and you risk having a hot spot that might cause detonation, carbon build up etc. Just don't - you want your pistons to be pretty like they came from the factory.

 

my friend said he fell some resistance when putting a screw driver down there.He had to put some pressure for the screw driver to move down more.You think he dinged it.If I put a camera down there do you think I would see it.I am never letting someone else work on my bike again.