Craig Whipps, our resident expert and soon to be our resident inspector, showed me how to do a bearing clearance test by sticking his gizmo in the PTO (power take out - the spark plug port closest to the prop) and got a very respectable reading of 0.013mm. It can be anything up to 0.081mm, so that is very good. As good as on his engine, he said. And that is a very good recommendation because everything on his plane is top spec.
We also checked the spark plugs which were also good: chocolatey at the centre. The gaps were as tight as they can go. But Craig suggested that to improve starting I replace them with Iridium plugs, and I have since ordered a set. They are called BR8EIX and are equivalents of the standard BR8ES plugs I currently have.
"Iridium IX Spark Plugs are the most technologically advanced high performance plugs available. Featuring a 0.6 mm iridium center electrode tip, they offer superior ignitability without sacrificing durability. The tapered ground electrode increases flame kernel expansion, while the superior heat range design is ideally suited to the demands of high performance environments."