Need help for 2001 WR 426 engine noise
Posted November 22, 2007 - 08:06 PM
Posted November 22, 2007 - 08:53 PM
When you set the lash check and make sure you don't have a valve that is sticking. That might explain the loss of compression. It could also be a loose timing chain so make sure that the cam chain adjuster is working properly.
Posted November 23, 2007 - 01:52 AM
If the crank was reversing , then the kickstarter would try to push your leg back up when you stopped kicking downwards.
Posted November 23, 2007 - 02:10 PM
Posted November 24, 2007 - 09:55 AM
Posted November 24, 2007 - 10:49 AM
Posted November 24, 2007 - 01:59 PM
Posted November 24, 2007 - 07:25 PM
Posted November 24, 2007 - 07:51 PM
I suggest for all WR owners to set the engine at TDC with the kickstarter, by hand, when leaving the bike sitting even over night. Get in the habit of doing this and the valves are all in the closed position. If there is any condensation in the engine it can cause the valves that are open during engine off periods, to stick and cause compression loss. WR Dave.
This was a big problem for me, but the condensation would freeze on the valve stems, holding them open. I think that the engine will generally stop at TDC if you shut down from idle with the killswitch. Every now and then I'd kill the engine in gear and let the clutch out before it had stopped spinning, and that's when I'd lose compression.
I also lost compression once in a while as I was riding, and it seemed that flooding fuel was washing down the cylinder walls. The engine had a lot of miles on it so ring to cylinder seal probably wasn't great to start with. Since you have new rings, they may not be completely seated yet, same problem but caused by too new instead of too old. I popped out my spark plug and dripped a bit of oil in the hole and the compression came back instantly and the engine restarted, so I knew those times it wasn't the valves.
As for your other problem, does the engine sound change if you pull the clutch in and release it (sitting still, in neutral) ? One thing to look for on the right side is broken clutch basket finger or broken fiber clutch plates. Since you have an 01 you probably have a lot of miles on the engine. If you haven't replaced the clutch basket, it's very possible that the fingers are notched.
This happened to me and caused me to start breaking fiber plates. The first time my engine started rattling I noticed the sound changed with clutch pull. I opened it up and found shattered fiber plates. I replaced them and they broke a few days later. I noticed that the basket fingers were getting notched, and thought the tabs on the plates may have been getting hung up in the notches, causing them to break.
I filed the notches smooth and a few days later my basket grenaded. Now I run a Hinson basket and have no problems. You can pop off the clutch cover easily to see if the ends of the fingers are all there. To check for broken plates, you have to remove the clutch pack. My plates broke into large pieces and all stayed in the clutch pack. Looking at the pack you'd think nothing was wrong. I opened it up and the plates fell out in pieces.