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Douglas Motorcycles - General Discussion / Re: Four speed Aero gearbox
« Last post by FN on 23 Jan 2021 at 17:17 »Inspection is not over now. What I found is, that the low gear pinion had a little bit more play than I would do it. The condition was not serious. The forks showed fresh surfaces especially in the regions, where the teeth could rub. All teeth showed rough surfaces. Sharp edges were present. I looked at the pinions.One had the DK mark on it in combination with D5. The other pinions got stamped with D5 also but not DK visible to me. The astonishing thing is, that bike got low milage after replacing many nuts and bolts. During that restoration the box was opened and sealed afterwars with plastic seal known from other components. If the flash was received over long time, it would have rubbed the forks completely down. I will continue my inspection. Below is the 4 speed spare parts list and I was checking for missing parts.