rebuilding that motor is easy, can be done in like 2 hours even as a first timer.
Use an impact drill to pull the clutch and stator nuts (or a rope or some other piston stop to keep the crank from turning) flywheel puller is the only special tool you need. buncha 5mm allen bolts on bottom, pull it all out slide off the seals and pop off the bearings, replace it all. shits are cheap and easy to come by. goop it and reassemble bam bam bam. I just rebuilt 2 sachs motors in my basement last week, doing a third maybe tonight.