TY250A exhaust bolts buggered

Discussion in '2 smokers' started by r60man, Jun 24, 2016.

  1. r60man

    r60man Long timer

    Mar 14, 2013
    Centralish PA
    I have a 1974 TY250 that I am cleaning up and restoring to service. First sign of issues was when I removed the bolts for the exhaust flange. One was 10mm and the other was 11 mm. Now neither one will go in.

    Is there enough meat on the head to drill them out and heli-coil them? Can I go to 12 mm or do I need to go up to 13mm?

    Thanks !!