Hello sir, ryobi trimmers and other models removal of the bell housing,removal of the metal bell housing,or clutch drum, on models 780R & 790R, here is what you do. after removing the trimmer & shaft assembly.remove the spark plug insert a screwdriver in the cylinder to keep piston from moveing. to remove the bell housing twist off the spring and using a T20 TORX screwdriver unscrew the retaining screw in the center of the bell housing (normal r/h thread) . push down firmely try not to strip screw head . you should be able to remove clutch housing.remove clutch using a pair of channel locks,works for me, (normal r/h thread) you should be able to remove front engine cover to repair what you need to.coil,pull stsrt, hope this works,. this solution applies to all trimmers with clutch removal~~~hope this helps,,any comments welcome,thank you. 11
SOURCE: replacing pull cord on 4 cycle gas trimmer, troy bilt
these usually are threaded counter clockwise need a pair of channel locks to hold the flywheel then with the other hand crack nut open
SOURCE: Replacing pull cord --After clutch drum
This is the clutch. It is threaded onto the crankshaft (r/hand threads)..get a smaller size flat head chisel and a mediium size hammer and give a few good whacks on the raised solid part near the middle of the clutch...not near the springs nor on the outer edges. This should loosen it and it will unscrew right off the crank..If it's stubborn, spray penetrating oil (Liquid Wrench or PB Blaster) on it and let it soak overnight. Hope this helps you.
SOURCE: how do you remove the clutch drum assembly for model #316.791890
rycgl gave a great solution for removing the clutch drum, but after the clutch drum is removed, you have to remove the clutch itself from the shaft. It's threaded on, and there's an arrow on the clutch assembly that tells you which way to turn it to remove it (CCW). Once that is removed, you can take the casing off the motor, remove a cover plate, and get to the incredi-pull assembly. Mine went south, to, and it was because the incredi-pull loops the cord around two plastic rollers that rotate around plastic shafts. Of course plastic doesn't hold up very well, so over time, one of the rollers stopped rotating, and the cord cut a slot in the roller and its supporting shaft, which in turn bound up the cord so it wouldn't retract. Fortunately, I caught it before it cut all the way through the shaft, and I replaced the roller with a short piece of 3/8'copper tubing. It works OK, but I'm not holding out too much hope for it to last a long time. Hope this helps.
SOURCE: Homelite trimmer ut 15151 How do I replace pull
Remove the tube that holds the flex-drive shaft from the front of the motor cover.Remove the rear engine cover. Remove the throttle cable from the carburetor. Mark and unplug any wires for the on/off switch that go to the ignition coil (underneath front cover) if possible. Now if you have pulled the driveshaft tube out of the way, the clutch drum is up next. Inside it, screwed into the very end of the engine's crankshaft is a Torx #25 screw. Before you loosen it, you will have to lock up the engine. To do so, remove the spark plug. Pull on the starter until the piston is down, then insert a length of clean, soft rope into the engine. The engine will come up and compress the rope, thus locking it in place to allow clutch drum and clutch removal. Loosen the T-25 screw inside the drum.. You may be able to remove it with a long thin-blade screwdriver also.It probably won't come completely out...it is made this way. Next, remove the clutch. It is screwed onto a small threaded section of the crankshaft Removal is counterclockwise.. It will be pretty tight. To help, apply peneterating oil. Whack the ears of the clutch near the center with a dull flat-blade chisel and hammer unless there are bolts. then use wrench. It will turn counterclockwise for removal and there will probably be a removal direction arrow on it's face. After getting that off, remove the Torx screws holding the cover to the engine. The starter unit should be mounted inside as it mates with the top of the flywheel to start the motor. Remember to preload tension (5-7 turns) on the starter unit. Make sure the handle is installed. Jam the unit with a screwdriver or vise grips so you can insert and tie off the new rope. Then remove jam device and let recoil pull your new rope into place while holding the handle. Reassemble and you are done. Disassembly requires Torx head drivers
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