Loose Starter Clutch Bolts...

[KoenigsTiger]

Hi Everyone,

I had the bike for 20 years. 32,000km, I don't ride much. I wanted to check the bolts. Some one had peened all of them before, but clearly not peened enough. They are 12.9 grade, but no Loctite was used. Some rubbing on the gear, and the backed out bolt head. All three bolts were loose, one was rubbing...

Gene

[fret not]

Apparently there needs to be a bit more deformation of the end of the cap screws.  Your nice photo shows what looks to me like a mark from a center punch, so maybe there should be another one or two punch marks just like the first one.  The idea is to deform  the end of the screws so they can't easily come undone.  This takes some force and effort to make it happen, then likely need to drill out the center of the screws if you ever need to remove them.  Use these screws one time.  Replace with new ones.

[KoenigsTiger]

Yeah, whoever used a center punch attempting to prevent them to back out, failed. One bolt did get more then one strike with a center punch, but nowhere enough. I got new longer screws and a went a bit over board with the punch an hammer. I am too embarrassed to post those pictures. :) But they are definitely not going to back out...

[fret not]

Just be aware the deformed "flange" of the screws needs to be relieved to remove them in the future.  Drill the center of the "mushroom" to make room so the surrounding threads can collapse onto the new hole as the screw is removed.  Remember that these screws are to be used only one time because of the necessary deformation. 
Also check the rollers and the ramps they wear on, as there is significant force involved in their function.  This force causes wear and then failure.  If you see ripples in the surfaces of the rollers or the ramps they run on it is then time to replace them before they finally fail and cause more damaage.