6th gear pitting

Anyone on here seeing their 6th gear on the primary shaft with pits? Seems to be a issue. Year, mileage, doesn't seem to make a difference. I have a thread over on SMJ about it. Now the problem is that gear isn't avaiable right now. Will any gears from another model swap over? Or the whole trans? I'm done rebuilding my motor and at the tune of over 2k I'm not risking a pitted trans gear to fail and ruin it.

Which gear is 6th? This is my 08 TXC250 --- ~950 hrs ---- Finally had to split the cases ...

Looks pretty good Ray, hopes mine looks as good as yours!

They look clean if nothing else ...

That might be 6th out on the right end of the shaft ...

6th is the second gear in on the shaft with the clutch. Opposite end of clutvh

When I inspect transmission gears, I look at the engagement surfaces of the dogs. The actual gear teeth are seldom damaged or show wear in normal circumstances.

I wonder if a 250 trans will swap into a 450-510

Here is my 06 510 trans with 12,500 miles. But it seems year or mileage does matter. There are 08's worse than mine.

Hey Pinittowinit, out of interest what sort of use over those 12,500 miles (20,000km)? E.g. Race, trail, commuting etc.?

Do you use the clutch all of the time? Servicing and oil type?
What was the rest of the engine like?

They were hard street miles. I wheelie everywhere and ride everyday. Oil and filter change 500 miles if that and valve check once a month. I only tore it apart as i figured i better do it before the lower rod bearing lets go.As for the rest of the motor... Well the lower rod bearing was "damm near perfect" according to halls. Here is the cylinder and piston

Oh yes I used the clutch all the time, and rarely went over 65. And rarely got into high revs

Oh yes I used the clutch all the time, and rarely went over 65. And rarely got into high revs

I was doing some of the vintage racing a few yrs back and the dog ears were a problem on bikes of that era (~33 yrs ago) ... not the gear teeth.... just the worn ears were causing the trannies to jump outta gear ....

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