Wednesday, July 22, 2009

Pop The Top

Engine disassembly has begun. To remove the top end which houses the overhead cams and the valves, you have to remove the cam chain that feeds through it. I had to buy a chain breaking tool since the master link on the cam chain is riveted. Once I received that, and figured out how to use it, I was able to get the cam chain off. The directions in the motorcycle manual say to make sure to tie off the cam chain so that it does not fall down into the engine when you break it. I did this with electrical wire, which I quickly discovered was not strong enough. Luckily, I had not pushed the chain link pin out all the way and the chain got caught on something before it fell all the way down. I got some wire hangers and bent those up to hold the chain. I took the head off and took a peek inside. The pistons and cylinders didn't look too bad. The valves looked pretty cruddy though. I could see the valve that I bent would not close all the way. Definitely going to going to need to be replaced. I also notice that the pin for one of the cam chain rollers was loose. I was actually able to pull it out and I couldn't figure out how it was supposed to stay in. After looking it up online, I realized that one end was supposed to be deformed like a rivet. Apparently that deformed part had broken off of mine. How did this thing not explode when I took it up to redline?
Breaking the cam chain

The broken cam chain roller pin

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