I have a 2001 yz426 that I'm currently working on. It had been running pretty well the last few rides, but I went to fire it up the other day(it didn't want to start) and noticed I could kick through the compression stroke with out using the decompression lever. This can't be good I thought. Fast forward to me thinking this is the perfect excuse to tear down the engine because I wanted to put Hot Cam's auto decompression exhaust cam in. I currently have it down to the cylinder and the cyl. head I dropped off for valve inspection because I have no tools to check if they are in spec and I'm guessing I might have a problem with them.
going to buy these.
Unless someone can suggest a better product.
Once I get the engine all bolted back up, I need to work on clutch, it doesn't feather anymore and I think my friction plates are just worn out..
I'm using a service manual 426 man put on the web. Been going really smooth so far. This is the first work ive done on the bike so I'm no pro but I can at least share my experience with you if you have any questions. Good luck to you!