Spark Advancer Stuck

[kMoto]

I ran into something assembling my engine that raised a concern. Is the spark advancer suppose to be able to rotate on the cam shaft when the bolt is out? Mine is solid as a rock on there. I didn't think anything of it when I pulled it apart, just because I wasn't sure it's function. As I read more about it, there should be some adjust there, correct?


I guess I'm not really sure how the spark advancer functions, so I'm unsure how to remove it.


Should I try rotating it on the cam to break it free, or should I try to press it straight out?

 

[frogman]

The cam has a locating pin in it that lines up with a notch on the back of the advance unit. SO NO. The little advance lobe on the front of it will move about a 1/4" inch.

It should just slide off the end of the camshaft if its not rusted on.

 

[kMoto]

Thanks. I got it off last night after studying the diagrams some more. I saw that little pin in there. It was pretty corroded on. I ended up sticking a punch through the hole in the plate from behind (cam side) and tapping it straight off. After some WD-40 and some scrubbing, it works flawlessly.

I'll post some pics of the disassembly later (left my memory card at home), for anyone who might have this issue in the future.

 

[frogman]

May look at finding new springs for it as well, mine were shot and I managed to find some at my hardware store that had the close to the same pull. I haven't put a test light on it but it feels like its advancing right.

 

[kMoto]

I'll look into that when I know these ones are bad. Not really sure how it's suppose to feel. Everything moves and turns nice and smooth after a good clean and lube.


Here are some pics for reference.




It felt pretty stuck on the cam shaft, but it came off with some pretty easy taps with a punch from the back.

I tapped the outer off from behind, through that rectangular slot in the plate, with a small round punch. (sorry for the fuzzy pic)...

Everything disassembled before cleaning...

 

[kMoto]

Btw, what is the function of the little plastic liners on the inside radii of the arms? Mine were pretty brittle and fell right off after this pic.

 

[frogman]

Polish it up nice and grease it and go looks like. The little things are rubber stops that are there to keep the weights from banging back against the center. Mine fell off right after I took mine apart and I'm prolly just not gonna worry about them.

Your springs should be tight enough to pull the weights back snug against the center at an idle. If not the bike will idle funny. The manual has some specs on advance start and full advance ending. Once you get it running take a timing light to it and check to see what you have. If it is in spec then run it, if not the springs need work or replaced.

 

[kMoto]

Gotcha. I'm not to worried about the pads either. I did remove all of my start junk and plugged the oil passage from the crankcase to the alternator, so getting it timed in w/ a light shouldn't be too bad. I'll scope those springs when I get it running.

 

[SpottheDogg]

A person could possibly make bumpers with a small dab of silicone??