Nahom
Member
- Local time
- 8:06 AM
- Joined
- Sep 23, 2016
- Messages
- 229
My method for removing debris from the crank case. If you are unable to get the pieces of broken ring out of the bottom end you may want to try this before splitting the case.
1. Remove the magneto cover. Remove the 4 screws holding the magneto. Remove the nut holding the rotor magnet, and the magnet itself. Mark the magnet rotor before removing so you get it on the right way when re-assembling. Be careful not to lose the woodruff key. There should be tutorials on youtube to cover this.
The reason for removing all this stuff is to protect the magneto from getting wet, and the magnet magnetizes the crank wheel making it hard to get all the pieces out of the bottom end.
2. Pour gasoline into the bottom end and slosh it around. Spin the crank around using the rod. Dump and repeat. If you have a old towel do all you dump outs on it so you can see what comes out. If you have all the pieces to the ring you have saved yourself a lot of work. If you don't have them all you can try blasting them out holding the engine upside down with a garden hose and pressure nozzle.
Again try to do it in a way you can retrieve what comes out. When you are all done use the fuel/oil mix for a final flush to get things lubed back up again. Good luck, and don't forget to order a case gasket if you have to split the case because the one in use will most likely be destroyed.
I would also suggest replacing the broken ring with a new one. It's a shame to do all this work and have the old ring you were talking about using from the old motor break after a short time. Or not seal properly.
Hmmm... this method isn't working for me- it's also a waste of petrol if it's not working. I broke some piston ring into 4 tiny pieces put them into old engine and 1 came out- I shook as hard as I could and I heard nothing as if nothing was inside but I'm certain 3 pieces are still inside. I'm much more comfortable just waiting for everything to arrive and taking the whole thing apart.
It's been a nice week though I've learned so so much thanks to this site + youtube and if I started again- I know I could make a working bike. I'll be back!