Do you have a puller to pull a motorcycle flywheel with a 27mm x 1.0 left hand thread on the end of it?
If not, you'll need one of those to work on the left crankseal on the blaster.
Once you've got the flywheel popped off the taper, you pull it and use an impact screwdriver to remove the two screws holding the stator plate to the case. Once the stator plate is off the quad, you pull the seal out by any means necessary EXCEPT damaging the case. If you nick the case, you'll have a leak around that seal forever and you don't want that. Lather it up with 2 stroke oil before you drive it in and use a FWD axle nut socket to drive it in straight. Once it's seated, you need to leakcheck your engine to make sure it's not still leaking there (or anywhere else for that matter)