[dm1605]

Good morning. 
I'm new to this forum so hope I'm in the right place.
Can anybody advise me please on a suitable spark plug for the 3.5 h.p. Aspera (Tecumseh) engine fitted to my M1.
Many thanks, David

[jezza]

Hello have you got the original spark plug as theres different thread ed widths and different spanner sizes, also the length of the central electrode is important as it can hit the piston uf it's too long Aspera used one size Techumse used another till they merged jezza

[dm1605]

Afraid not but think I've found what it is now.  So thanks anyway.