I have a prairie 400 and I can't find the spark plug to change them. Where is it??

 

I believe it is on the left side. (of cylinder?)

I know its not front.
Not rear.
doubtful right.
gotta be left, yes, that's it. One plug.

Make sure the hole is clean before plug removal. Squirt some air from a compressor or one of those keyboard cleaner cans.