I ran in to problem with 42 cc's engine.When i read about 'bolting out' an engine from chainsaw and use it for airplane i was about to jump in it.It,indeed sounded sweet.Went in the same place-Ebay and found a ton of cheap ,relatively cheap chainsaws.Then made some search here and found out about the problem with magneto...Gave up on it.You see I think electronic ignition is nice and cool but if I buy motor for 40-50 $$ there is no way i spend another $$100-150-200 for electronic ignition.