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[Kevin Wood]

Figuring out why a simple motor doesn`t work is a good stepping stone to the bigger stuff

I think the first engine I tried to strip & rebuild was a 4 stroke Suffolk Punch L/mower engine
Made loads of mistakes & broke one of the piston rings & forgot to keep tabs of what went where.   I learnt a lot from that project.

I`ve tackled outboard motors & motor cycle engines.
 
now I can`t stand seeing ppl binning petrol strimmers & mowers at the tip 

Yep, I was about to say that an old mower would be a good place to start. They are cheap / free as most consumers buy a mower, never service it, then bin it or chuck it on freecycle the instant it fails to start. The principles are exactly the same as for a larger car engine yet you can play with very little cost.

[tunnie]

I found it very interesting and satisfying fixing the Briggs & Stratton engine on the lawn power, stripping it down and cleaning the carbs etc.

The joy at in then firing straight back up  (once i realised I had to re-attach the spark plug lead)