Accidentally drilled the last hole on a scrapped bike, a bit too big. At first I bought a regular set of spiral coils, but the larger hole caused oil to leak out of the stub and I couldn't tighten the screw properly. This kit, as designed, does not allow oil to seep further where the large kit mates with the crankcase. The instructions say to lubricate the insertion tool before inserting the large certificate, which I think is a must. I took this a step further and applied oil resistant silicone to the outside of the large bushing where it connects to the engine block and that solved my problem.
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