Yeah, so i checked the spacing, and it isn't even all around. I noticed that sound, too, but thought it was all part of the same problem. Anyway, that means of the three gear & shaft parts i have, all of them are warped. Each one also seems to have quite a bit of wobble on each end of the shaft... Is there any easy way to fix the spacing? Could it be a sign something is screwed up, or should i just keep replacing gears until i get a good one?
Even on our bigger heli's, there is going to be variances of that gap between the main motor pinion and the main-gear... When you set the gear mesh, make it a habit to check the mesh from a few points on the main gear. And then find the inbetween and go with that.... To help you maybe understand a bit further in detail here is a quote from RC-Heli magazine and the link to the tip :
Note that, since some gears are not a true circle, you need to check the gear mesh all the way around. If you find a point on the gear where it meshes more tightly, this is your high point. Mark this spot on the gear and set the gear mesh to this point. I like to set my mesh a little tight at the high point so that the rest of the gear is meshed properly. With a little breaking-in during flight, the high point should wear itself down to a good mesh. After a few flights, recheck the mesh and adjust if necessary.
http://www.rchelimag.com/pages/howto...owto=29&page=2
The gear mesh won't have anything to do with the wobbling your having on the heli, but will wear out your gears faster, and also creating excess drag and heat problems, reduced flight times, etc. etc...
What will make your heli wobble is your spindle / feathering shaft (same thing) and they almost always need replaced in a crash. Definately check it and roll it on a piece of glass... After a crash, I don't even check mine, I just replace it... Just a very slight tiny bend will cause havoc with your heli without a doubt.
To remove the spindle, it best to use 2 alan wrenches on each end of the spindle to break them free... Usually one will free up, and then allowing you to slide the spindle out as the blade grips should loosen up then to remove them also.
Most likely, if that spindle is bent then that is the big cause of your vibrations, following then by imbalanced blades. But the spindle would be the #1 cause at this point...