In the Jabiru engine maintenance manual (JEM0002-7) it indicates (on page 48 of 106) item 17 says replace spark plugs. Now, I'm doing the annual but only flew about 10 hours since the last annual. I'm not replacing the plugs. Do I tick the box or what? Reading the previous posts here, at my current rate of flying, matter transporters will be in common use before I get 500 hours or so on my Jabiru. Bruce, I'll swap a nice red for a leak-down test, how about it?