Cylinder head thread broken.
 

Hey just bought honda cbr 929rr model 2001
and the cylinder head thread is broken so im thinking of making new thread 12x1.25 normally its 10x1.0 so what you think will the bike for normally if one of the spark plugs is different ofc the heat number and lenght of the spark plug will be the same as other 3 stock spark plugs
any suggestions?

thank you

Did it
 

Made new threads and added larger spark plug,
working like a dream!

Congrats on getting on top of your issue. Glad to hear you got it sorted out.