Over-Advanced Automatically?

[PHeller]

I have been fighting charging issues for awhile now, mostly the old regulator on my bike. Finally picked up a PMA, so that issue should be solved.

However, the other night I took the bike out for a quick clear of the pipes and it was running like crap with a full battery. Bogging after half throttle.

I checked the timing, and it was advanced wayyyyy too far. Fine at idle, but swinging right past the advance mark. I set it a month ago, locked the valves in perfectly, and tightened the cam chain.

What happened?

 

[weekendrider]

Is the ATU new? If not search for Retiregentleman post on peening(spreading) the part of the weight that sits in the notch. I can't remember the measurements for sure...........

 

[PHeller]

It's not a new ATU, but it was recently working fine, holding advance right at the mark.

Should I peen the weights or just adjust the spring tension?

 

[weekendrider]

Well I dunno. Retiredgentleman gave a base measurement to check but tighter springs may do it.

 

[gggGary]

Spring tension will change WHEN the advance occurs but not the upper limit.

 

[retiredgentleman]

It's not a new ATU, but it was recently working fine, holding advance right at the mark.

Should I peen the weights or just adjust the spring tension?

Peen the weights for a tight fit in the slots of the slotted disk. Spring tension has nothing to do with the range of the advance.