I had trouble with an 18RG all year. The engine ran okay at low revs but sounded like it had a rev limiter fitted at high revs. Everyone said it was running lean and I did everything I could to fix that but I couldn't find the problem. I took it too PBE Dynotech in Newcastle and he found the problem straight away. Coil was dying. Installed a Bosch coil and it runs the way it should.
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