change?

When looking at the points of an old engine I've picked I sometimes see what looks like a little "cap" on the contacts of the points. To me this looks as it should look. Maybe more of it should be htere but it's still there. Is the general rule to change them when it's all worn away? Below...

Does anyone know a source for sprockets other than teeth # found on Baja 6.5 jackshaft? I would like to have a 9 and a 11, 12, 13 tooth sprocket to replace the 10 tooth sprocket. I would also like a 18 - 22 tooth sprocket to replace the 20 tooth sprocket. The problem is the shaft is 17mm and...

got my 6.5 clone installed- how long do I run the break in oil before changing it? I did dump out the shipping oil first before I ran it the first time- put some 10W-30 in there just for the break in period- I plan to run Mobil 1 fulltime once the break in period is over...

Is it better to change a tooth on your clutch or 6 on the sprocket?