events in my life have caused me to drop my bonne project for a long time. but now i am able to start back on it a little at a time. i have the engine ( 76 OIF 750 ) down on the work bench and am working on splitting the case. I removed the the contact cover and also removed the contact plate. the bolt holding the advance unit was pretty rusty. i heated with a torch and soaked it with penetrating oil several times. and as with as much finesse as i could muster proceeded to snap the head of it off. I am guessing that the rest of the screw is in the camshaft. i am going to replace both of them so i dont "think" i have to worry about it too much. but how do you get the lobed cam off of the shaft so i can get the advance off? gear puller?

Wrap a piece of leather around the cam and grip it with vice grips. GENTLY work it up and down and side to side. The taper will let loose and you can remove the cam. You can then proceed with the take down.

The tool for removing this part is just a bolt with the threads removed at the end. There is a thread in the actual auto advance (probably UNF on your bike). When you screw the bolt in it presses on the camshaft and the advance pops off. In your case you would have to vary the unthreaded portion to allow for the piece of broken fixing bolt in the camshaft.

it broke off even with the end of the advance. so i spent the better part of the day carefully drilling ( and trying an E-Z out to no avail ) but have it down almost 1/2 inch deep and i can see the threads on the internal part of the advance. how much further do i have to drill to get to the end of where the advance meets the cam??

Sounds like almost an inch you have worried off the end of the bolt. The thread in cam itself is 5/16. Thread a 5/16 bolt into as far you can and it may bottom out on the stump you have left in there. It may break loose the taper. If not see the post I put on earlier, that does work.

If you can thread a 5/16" (UNF) bolt onto the AAU, a *light* but firm tap on the bolt head N - S - E - W. Unless the thing has been sitting underwater, it should fall off the camshaft taper into your hand.

Steve

i saw that and did try that. first i used rubber from a an inner tube...then i did heat the shaft and use leather. its not budging at all. hence why i posted again. i hate to strong arm something for fear of doing more damage than i can fix.

Dale,

Try the 'tapping' method. The shock of the tool hitting the bolt is what will release it from the taper....

Steve P