Can't remember exactly when, but part way through the early stages of the build it was thought a good idea to see if the engine would run. It had only been roughly assembled up to now so carb cleaned, new fuel pipe fitted, bolts tightened and so on. The recoil starter was a problem. I had 3 of these, 1 complete and 2 in pieces. The complete unit was fitted but locked up when the cord was pulled.
I had this apart 4 times before finding the problem. A missing spacer washer. Wasn't sure if this washer should have been there but it did the trick. One of the other units had one, the other didn't. After the 4th assembly I was getting the hang of fitting the recoil spring.
Clamped to the bench, petrol in the tank, starter pulled, and pulled and pulled, nothing. No spark. Cover off, points cleaned, they were furred up, and away it went. There was a knock which appeared to be from crankshaft end float. A PM to Richard ( Anglo Traction ) who suggested that the knock might disappear when the engine was under load. This proved to be the case. Thanks Richard. A few bench test runs followed and the engine appeared good to go.