I never had any problems with my Suzuki 4 -strokes but I run them every day. I think that is the secret. The worst thing you can do is only use your motor every 3 or 4 weeks. Maybe the charter guys can chime in. They run em every day. I put 900 hours on my first one and sold it still running strong. Ive put 800 hours on my new (3 year old) one with zero loss of performance or repairs. Ive talked to bridge surveyors and comercial clammers who have put over 3,000 hours on Suzukis with out any major repairs yet. I imagine any 4 stroke from Honda or Yamaha will hold up as well. The e-techs have been around now about 4 or 5 years so there should now be a history on them. Maybe some owners can chime in.