I split the case, and looked at the gears inside but I don"t see any broken teeth. Something is knocking in the transmission really bad, what else should I look for?

 

What kind of bike do you have? If it is a shaft drive you might wanna check out your rear end ring gear and pinion in the shaft drive. My 85' Big Red was making the most aweful noise that sounded like it was coming from the trans/left side engine case area but later found out that a couple of teeth had been sheered off of my ring gear [img]i/expressions/face-icon-small-shocked.gif[/img] and were floating around inside my shaft drive. So that might be worth a check if it is a shaft driven bike. If not totally disregard this post. Later.

 

It's a 1980 185, as far as I can tell. I have the tranny case open and can't figure out what is making the banging. When it's running it's real hard to get into nuetral. It knocks the loudest in first gear but not that much after that.

 

Check all the bearings that both the main shaft and the counter shaft ride in.

There should be NO slack in any of them. If you do have slack, be sure to replace the bearings on BOTH ends of the shaft with the bad bearings.

Your problem is definately transmission related from near as I can tell with the decription that you gave. If you do have any broken teeth on any of the gears, check the bearings that I mentioned and also check the clutch basket bushing. Also check the bushings of each gear for wear. A bad bushing will generally, but not always, have a blue coloration on it.



Something is slightly misaligned and that is why the noise is more pronounced and more of a problem at low speeds rather than at higher speeds...where the worn parts tend to "float".