|Title: Countershaft bearing|
|The_XL_Board > THE XL BOARD > TRIALS, OFF ROAD, TRAIL RIDING, ENDUROS||Go to subcategory：|
Date Posted：05/24/2010 4:46 PMCopy HTML
Riding the bike on a trail at the weekend and on the way down the engine got pretty hot and started to squeal and chafe in and out of the gears, noise goes away when it cools down or the bike takes a right turn.Noise is also there when coasting.
The gearing means that I am running 8-9K to pull enough speed on the highway but this drops as I hit the trail and the noise goes away.
Just wondered could the countershaft bearing (the one nearest the drive gear) be spinning in the case as it heats up.
The drive is otherwise very smooth.
Date Posted：05/25/2010 11:40 AMCopy HTML
8-9k seems pretty high rpm's for extended periods... Not in red line but close. I guess you need to go that high to get to highway speeds.... But wow, that's a lot of cylinder wear.
I would think that most of the load on the countershaft would be on the bearing near the countershaft sprocket. I'm hoping that the countershaft bearing is always spinning, even when it heats up.
Could the noise be coming from the clutch? You say it is there when coasting? Coasting with clutch pulled in? How does it sound when coasting in neutral? When the bike takes a right turn more oil would pool into clutch casing.... Is the clutch slipping? Is the clutch cable too tight not allowing it to fully release? What if you shift without the clutch? Do you get the noise?
When was the last time you changed your oil?
Date Posted：05/25/2010 12:44 PMCopy HTML
Really I need another gear or I should carry this bike on a trailer.
It goes like the clappers but I think I should have changed that bearing when I split the cases.
Noise still there with clutch disengaged.Oil changed regular.
Its fine round town just extended high speeds, maybe I am asking a bit too much of it and should change that back sprocket!
Date Posted：05/25/2010 12:55 PMCopy HTML
Changing that back sprocket smaller would probably put too much of a load on the engine and it may not even make it to high speeds... I've never seen a transmission bearing fail on any of my honda sl's or xl's, but I guess its possible.