My WR450 won't select 5th gear
Posted February 02, 2011 - 02:47 AM
I have a '05 WR450F and the bike will not shift into 5th gear. It runs fine in 1st to 4th but when you try to shift into 5th the lever wont move like it has no 5th gear.
Just wondering if anyone has come across this before and what you did to fix it?
Posted February 02, 2011 - 04:36 AM
Posted February 02, 2011 - 06:57 AM
No I'm not the original owner, I do know the previous owner and he said that the bike ingested water on the trail, the bike was not riden after this, all oils were drained, flushed and refilled then the problem occured on the next ride. My mate stripped the engine/trans down but could see anything out of the ordinary and seemed to shift ok on the bench, but when all together in the bike no 5th.
Posted February 02, 2011 - 12:32 PM
Posted February 02, 2011 - 05:42 PM
Posted February 02, 2011 - 07:29 PM
Anyway back to the bike, I have tried what you suggested and was very deliberate with the gear changes and it selected all gears fine with the back wheel off the ground. I decieded to take it for another ride and now it will select 5th but has no drive so I'm thinking it may be a similar problem that other forum members have faced. possible bent selector fork and/or damage to 5th gear dog teeth??
Im going on holidays in 2 weeks so wont get a chance to tear down the transmission, but will do on my return, will let you guys know what I find.
Posted February 05, 2011 - 05:17 PM
Posted February 05, 2011 - 09:27 PM
Posted June 13, 2011 - 03:53 AM
Will post when it's all back together and let you guys know how it went.
Posted June 14, 2011 - 06:44 PM
Posted June 30, 2011 - 07:08 PM
I've added so pictures so everyone can see what went wrong with my bike and hopefully help others in diagnosing their bike.
This is the 3rd gear pinion, as you can see there is damage to the dog teeth and bits chipped out of the teeth.
This is the 5th gear pinion, you can see where the dog teeth from the 3rd gear pinion have been rubbing on it causing it to wear down about 1/2 to 1 mm
This is number 2 selector fork, I believe this is the cause of all the drama, you can see the wear marks on it.
Posted July 01, 2011 - 05:27 AM
I'm a member of a lot of different forums (mainly automotive), and it is frustrating to find a thread in which the OP is having the exact same issue as you are, but they never came back to tell how they fixed it. Kudos on a diligent diagnosis, repair, and documentation.
Posted July 03, 2011 - 12:01 PM
I have the same problem. A bent shift fork looking exactly as on the pictures in this thread. Gonna order a new one. Was thinking of replacing the gears for 3rd and 5th as well, but they were quite pricy (at least here in Sweden). How much of wear could I tolerate without needing to replace them?
My 5th gear looks like this:
This gear isn't really (in my opinion) in to bad shape, and should be usable. Or what do you think?
My 3rd gear looks like this:
What do you think? Is there to much wear on this gear to reuse it? I'm thinking about getting either a friend or some local shop to use a grinder and fix this gear if it is possible. Here in Sweden, this is a $250 part:foul:. I don't want to buy that one unless it is necesary. But I dont want to split the engine again either...