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?

Good idea 👍

Have you tried Paul Knight? There may be something in the Used Parts store.

P.

If you have another look at the Shop, you will find the correct washer for the OHV models from 1927 to 1938. It is listed as S1-MB-07, and is Marston part number 3410.

P.

Greetings All
Need a bit of advice. I'm a newbie here on MSCR and not much good on forums tbh. I recently acquired a 500 Lion that had been asleep for a while. It surfaced at auction in Arpil this year, was bought by a dealer, who spruced it up a bit, then sold to me. It acutally seems like a nice bike. tank is clean inside and its an easy starter and all original.

I'm after any diagrams / schematics / drawings of available engine / gearbox internals / workings. I know the SV engines are quite basic but I'm a visual learner and this will help me decide if I want to take certain parts of the engine / gearbbox down to rebuild, etc.
Hope someone out there can help me
Ta