Restoration of a Stuart 600 - Nigel Mcburney      
                                            Part 4


Perhaps at this point I should mention that the Stuart 600 was not supplied as a finished engine, only as a set of castings, for the enthusiast to machine and assemble, Stuart's offered to machine certain items ,at some cost, which were too large for the builders lathe, also optional were a second flywheel, a cast sub base, ignition was by wipe contact and trembler coil ,they did offer a magneto kit, with mag, mag bracket, chain and sprockets though the cost was over half the cost of the engine casting set ! The engine would run on gas or petrol and  again a Stuart carb was an extra. I do not know when the engine was introduced but I have a page from a catalogue that builders had completed engines before 1923 and its generally thought that it was taken off the market around 1940 . Why build your own engine? well prosperous amateurs at the time usually had to treadle their lathes, building an engine meant youcould  stop tredalling, mains electricity was not generally available and electric motors were very cumbersome and expensive ,mains coal gas as a fuel was available, plus if you could obtain a small dynamo it was possible to charge the lead acid glass cased accumulators to power your new radio, other wise it was a trip to the local radio shop to get the accumulator charged. I have seen a set of 600 drawings, so cannot comment if our engine is built exactly to drawing though it does appear to be similar to other Stuarts I have seen, screw threads are BSF with a few BA threaded screws. I spoke to Charles about this engine many years ago, he told me that when running on gas the hit and miss governor did not work that well and was not suited to evenly drive a dynamo, so he had about three experiments with petrol carbs regulated by the fly ball governor and eventually succeeded in getting an even running engine, he said to me that his work was a little Heath Robinson but it works very well, I did try it on propane gas but as Charles found it is not ideal.

So I decided to continue with the reliable late 1930s Amal carb, after all it did run for a very long time with this arrangement. I was also very lucky in finding a fellow enthusiast who had a Stuart sub base and got me a new casting using his base as a pattern, the sub base certainly improves the appearance of the engine by raising the bottom of the flywheels above the base level.


Nigel Mcburney

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Last Updated: September 2020
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