Hh120 plug requirements

[summatyme29]

HH120 spark plug requirements? Currently has ab6 but reach is too long and striking valves.l think it might have been bored out for this plug.
Help please l got it running but dinging the electrode.thanks Jim

 

[summatyme29]

Not the original motor believe 69 hh120 into 1974 tractor

 

[wore out]

HH120 spark plug requirements? Currently has ab6 but reach is too long and striking valves.l think it might have been bored out for this plug.
Help please l got it running but dinging the electrode.thanks Jim

Link to Tecumseh spark plug chart...

http://www.psep.biz/store/tecumseh_spark_plug.htm

 

[summatyme29]

HH120 spark plug requirements? Currently has ab6 but reach is too long and striking valves.l think it might have been bored out for this plug.
Help please l got it running but dinging the electrode.thanks Jim

 

[summatyme29]

Great thank-you for the chart,confirms right plugs,thread don't fit.So this machine has had the spark plug hole reamed out.NGK AB6 is in it 12mm reach.I need a 9.5 mm reach.I believe 18mm thread and 9.5 mm reach.Brian Wickie you got a plug # ?

 

[Fritz Maurer]

If the plug fits, other than hitting the valves, install another spark plug gasket or two and raise it up some.