Your timing chest appears to be missing the drilling for the pipe to the oil gauge. This may be because it has come from a W/NG model which lacked the oil gauge.
If you look at the detail photo of my 1936 LG250 you will see the location of the banjo union of the oil pipe, on the next flat below the ...

I do own such a pump but it is on loan to a fellow AOMCC member who is having problems with the pump in his engine. I will alert him to your post.

Paul

Take the primary chain and sprockets back off, followed by the primary chaincase inner. Then fit the footrest support which goes through that large hole in the chaincase. You might want to think about a repair to the chaincase hole first, where the primary chain has worn it away on its lower side ...

The photo says it all:

I have been running my 1937 RH500 (with later cylinder head) for many years now with just the timing case breather. Why do you need to add a breather?

It didn't take long to find the first problem. The frame appears to be twisted. If you look at the bubble on my spirit level it shows almost level at the front of the frame but well away from this on the rear forks and it changes consistently as you go along the frame. The photos should enlarge so ...

To test any Ariel plunger pump, take it off the engine, raise the plunger above the upper drilling through the pump body and put some oil in down that drilling. Put on eye protection. Depress the plunger smartly. If the pump is working as it should, it will shoot oil in the direction of your eyes ...

Greg,

Don't be too envious of the front fender - it is lacework in places so needs quite a lot of attention:

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Nev,

Thank you for your kind words. These machines can be a great bike to ride - I did over 16,000 miles on my previous example.

Karol,

You have already ...

See:

https://www.ebay.co.uk/itm/128081299357

I wonder which year the bike is?

I bought the basis of this project about 18 months ago and decided today to do a loose assembly to see what is missing, at least in terms of the large parts. Although the engine is not yet assembled it came with new big ends done by Alpha and a newly rebored cylinder and pistons. I do have rather ...