alright i pulled one of the spark plugs out of the h23 i got and i guess whoever put it in the first time crossthreaded it becuase it
was hard to take out.... well i was putting a new one in and got it about halfway and it started getting really hard to turn.... instead of trying to put it in i just took it out... is there anything i can do get the plug in there without breaking it.... please help..thanks....

 

retap......probably will have to pull the head.....cause trash will get down in the cylinder...good luck