oil n plug?

I don't know what the manufacturer calls for but its only gear oil in there so I wouldn't think you should have to very often, kinda like transmission oil in your cars. And your spark plugs can last a long time if you have proper jetting. If your jetting is off, you can ruin a plug pretty quick. They are $2 plugs so I typically just go ahead and change them any time I'm working on it or notice something off just so I can rule out a bad plug when trying to diagnose a problem
 
I don't know what the manufacturer calls for but its only gear oil in there so I wouldn't think you should have to very often, kinda like transmission oil in your cars. And your spark plugs can last a long time if you have proper jetting. If your jetting is off, you can ruin a plug pretty quick. They are $2 plugs so I typically just go ahead and change them any time I'm working on it or notice something off just so I can rule out a bad plug when trying to diagnose a problem
ok cool thanks