Have a look at:https://marston-sunbeam.org/sunbeam_shop17/index.php?id_category=7&controller=category. We can supply good quality copies of all 1935 Marston manuals, instructions, spares list and catalogues. Although not workshop manuals in the modern sense, these booklets will be very helpful in maintaining your machine. Although not illustrated, the spares list gives you a good idea of what should be on your Lion, and the illustrated 1932-34 list shows what they should look like.

P.

Have you tried F.W.Thornton in Shrewsbury?

Hi everyone,

Would anyone have a spare 7.5:1 piston for a 1930 machine they would be willing to part with? My cylinder is +30 thou so I can take the bore out if necessary.

Thanks
Michael Thearle

https://cyclesautomoto.files.wordpress.com/2011/07/1927-amac-catalogue.pdf
Some similar non needle pictures and parts lists at the end of this manual.

I've had no trouble with the short 18mm plug..you could always use a 14mm with an adapter.
I'll keep an eye out for the needle less type and I'll ask a friend who i think might use one.

cheers John...that manuals for an M type with throttle needle mines a PJY no throttle needle anyway not sure what the issue is.....I'm sure has to be with the needle and float levels.....I'll persevere....I've also stumbled upon the fact that my vintage spark plug is only 1/2" long reach but the actual plug hole is 3/4" or there abouts so that's likely the issue with difficult starting....I know 18mm long reach plugs are like chickens teeth Green Spark plug Co had a batch of KLG ML50's made but they've sold out and they're not getting anymore made either sadly....I'll have to scour the jumbles etc....cheers

Russ

https://rickparkington.co.uk/amac-carb-query/
Found this on Rick Partingtons site.
I also found an Amac manual on Flickr, if you Google amac manual and search Images you should find it.

Petrol still floods out of the small air intake hole below the mixture screw....it has to be an issue with the float chamber the float needle is spot on 76mm the copper float looks good....I'm just wondering if the tickler is the right length does the needle need to sit inside the tickler tube and use it as a guide? I get the feeling the needle misaligns with the short tickler tube and gets stuck inside the float cap and stops the needle shutting off the fuel...of course I might be talking total tosh anyone got any thoughts by the way The tickler on my carb is flush with the inside of the float cap see if you can make out what I'm trying to convey from my rubbish sketch I did on my phone LOL 😆 cheers 👍

Cheers Paul I'll order one ASAP 👍

How can I reach him?