In the immortal words of Steffi Graff when a spectator shouted "Will you marry me?" She replied "How much money do you haff?"
If your a skinflint like me, repair it. If you've got the dosh get a newer model with a warranty. The increased output is not a problem.
You can do the starter motor from the top. Easiest to take off air filters and side panel (if you have it!). Once you've got it off clean up the shaft but, do not grease or oil it, this attracts crud and makes it worse than before. I'm told graphite, pencil lead, is good to lubricate it.