yep theres a choke plate screw MIA. Pulled all plugs,rotated engine over bumping starter, hear the noise when #1&amp;6 cylinders are both at TDC. eyeballed the piston tops best i could thru plug holes, couldn't see the screw, but #6 seems to have some marings on it. So guess its time to pull the head &amp; get it out. Who has head gaskets for this waukesha gas motor? Meaning what companies?