Amal 225/3

The carb for the Mark III is like no Amal I've seen before.
Wonder if it's possible to get spares if needed?
At least a visual inspection shows that the tickler is missing.

Newsflash

Got me another JAP engine project too as well as the Howard GEM Rotavator ( rototiller) it is attached to. The engine is a 600cc s.v. Mark III Type 5

Engine number is:
UCZ/Z
94433\5

If I'm correct that would be:
U = 600cc Side Valve Engine, 85.7 x 104mm bore and stroke
C = Sports Engine
Z = Dry sump Lubrication
Z = 1933 Model Year

U is a standrd 6hp (4½ hp nominal) engine, according to The JAP book so what with the C marking?

The JAP Engine Reference there are more alternatives and the Mark III engine is recognized as a Sports engine.

My hopes were that I could get it started. By lubricating with the famous Omega Omicron  636 penetrating oil. So far I have got the valve lifter, throttle and most other leavers and functions to work.

Unfortunately the next step is to dismantle the cylinder head to see how bad the cylinder and piston is since the engine is stuck.

Inspiration

Found a bunch of pictures on another blog. Obvious staged, the same chain-less Excelsior appear on many of the pictures with different drivers.

All together

Small step

Made some progress with the valves. Unfortunately I have a house and a garden and it's spring time and ...

Anyway, managed to mill the holes in the valve stems and cut them to the appropriate lengt. Since I do not have any valve grinding machine I will have to make a jig to grind the end of the valve stems. Hopefully this weekend (as long as the weather is rainy I can't do any outdoor painting).

Gearbox

Visited a swap meet today. My intention was to buy a Sturmey Archer 3-speed gearbox. For some reason I bought one Albion 3-speed and three Albion 2-speed gearboxes.

I maybe could use the 3-speed for the Baby Nut but why did I buy the 2-speed gearboxes. And I do not think I can get one working 2-speed out of the three of them.

End mills

Finally got the end mills I ordered all the way from China. Sold as Solid Carbide HRC60 and as such they should have no problem milling stainless steel stems, or...

Valves

According to an old James Catalogue, the valve dimensions are as follows.

According to my measurements the valves are somewhat longer.

Anyway I'm not patient enough to wait and see if any JAP valves will pup up so I scanned through some valve makers catalogues and found out that Manley GEN II exhaust valves are pretty close.

Found a set of eight valves for sale on eBay. These were custom made and the valve head was close enough to fit without modifications.

Valve head = 1.6" & Valve stem 7mm

Of course they will have to be shortened and modified with slotted stem ends.

The main concern is if they are too heavy compared to the original ones.

In case they can't be used I'll buy some used NASCAR titanium valves and try to modify them instead ...