5th Gear Problems On 06!

I am having problems with my bike when I shift into 5th. It kind of lurches and almost seems like that it cuts out. I can hold it wide open in 1st through 4th with no problems, it just pulls and revs out. I even tried a fresh filter just to make sure that it was not plugged. I have not ever lost a gear before that did not either seize up or make a racket when it popped in and out of gear. My next step is to tear it down but I thought I would see if anyone has ever had these same descriptions of a blown gear.

Can it be ridden in fifth gear under any condition or does it lock up?

Yes it can be ridden in 5th. It just kinda of lurches and revs.

Is the clutch slipping because of unsuitable oil oil? Fifth gear will have most traction & might show a slipping clutch when you don't notice in a lower gear.

The clutch is a full Hinson and is definately not slipping. I have been very regular with oil changes and have been using Delo 400 with fresh oil after every other ride.

i would try switching your oil. even though everybody says those deisel oils are ok, I used rotella and had to put a new boss and pressure plate and clutch plates because my clutch started acting up, not sure if it was the oil or not, but I am not gambling again.

My bet is the oil. If not, does it seem like the engine is bogging temporarily? If it was a gear problem you would notice it jumping out of gear or worse, a nice trip over the bars!! I would suggest finding a nice open track and do some testing, fifth gear slowly wind the throttle on then build up the accel until you figure out exactly what is happening. ie clutch slipping,motor bogging etc.

Bel-Ray 4-Stroke Thumper Oil.. That stuff is really good.

The problem is not the oil and it is not the clutch. It is jumping in and out of gear making the bike kinda of lurch and rev back and forth. I have got the motor out of the frame and on my bench. After lunch I will tear it down to have a look see.

Well I got it all tore down, The dogs on the 3rd pinion gear are rounded where they match to the 5th pinion gear. In addition the center shift fork is worn where it mates to the 3rd pinion gear. Everything else is in perfect shape. It still makes me wonder why it would do that, 5th gear is used the least.

Does it sound like you are fanning the clutch..? If so mine did the same thing..What you have done is rounded the dog pins and it is disengaging and re-engaging into gear,mainly under load...Mine was only 10 hrs old when it did it and Yamaha told me i was on my own and no warranty would be given.( I was spewin")

Sad to hear of another coz they are an awesome machine.

Yamaha need to address the problem coz it happened a lot on the 5 speed WR's as well...

I opened mine up for 1/2 mile in 5th and I didn't notice anything wrong, it flat out hauled.

this makes me nervous!I still have a deposit on my 2007 ,but this has got me thinking.

yeah same here. My 04 250f has given me years of problem free use. The last thing i wanna do is spend 6500 and start having to tear my bike apart every year.

Well I got it all tore down, The dogs on the 3rd pinion gear are rounded where they match to the 5th pinion gear. In addition the center shift fork is worn where it mates to the 3rd pinion gear. Everything else is in perfect shape. It still makes me wonder why it would do that, 5th gear is used the least.

You most likely bent the shift fork at some point and it is just now causing a problem. A simple slide out that catches the shifter can bend the shift fork slightly, it may not be a problem until the dogs on the gears get worn enough to let them pop out and then the gears are done.

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