jackpiner spark plug

[Mick Milakovic]

I'm restoring my brother's '74 Jackpiner for him, and last night I pulled the plug and it is a 3/4" reach plug.  My '75 Harescrambler is a 1/2" reach.  Is the JP really that size?

[tomale]

I don't think it is, every KTM motor that I have everseen has a 1/2" plug hole. best to check the head out and be sure. There is no worries to the piston hitting the plug but it is not a good idea to run the wrong size plug. hopes this helps

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)
78' 400 MC5