Parts are available, both new and 2nd hand, for the range of J.A.P. Staionary engines.
Sorry but not every part is available.
Do you know the age of your J.A.P engine?
Find the engine number stamped on the block, the first numbers are the model number, next is a letter. This is a code for the year of manufacture. Give me a call and I will be able to date the engine for you.