Rebuilt starter drive

[Stan C]

I am getting an ahhh-ooooh-gaahhh noise when starting my 79 CB 750K. It only makes this sound when I start the bike and it begins to run with the starter button pushed for just a second. I have replaced the three bolts on the drive with higher quality bolts and use blue thread locker. I also installed new rollers, pushers and springs in the drive. It still makes the ahh-oooh-gaahhh noise after the work. I am suspecting a worn or dry bushing at the opposite end of the starter drive gear. Once the bike starts to fire up, the load on the starter drops and the shaft is free to "bounce around " inside the bushing which I think causes this noise. I have not been able to find any detailed drawings of the starter motor to see the construction of it. Anyone had any experiences with this, I would like to hear.

 

[ScottishBadger]

Sounds like a dry bearing in the starter motor. It's easy to remove and dismantle, I took mine out and fitted new brushes last year. Strip it, clean it out and check / lube the bearings. Personally, I'd fit new brushes whilst in there.

 

[Stan C]

Sounds like a dry bearing in the starter motor. It's easy to remove and dismantle, I took mine out and fitted new brushes last year. Strip it, clean it out and check / lube the bearings. Personally, I'd fit new brushes whilst in there.

That's what it sounds like to me as well. I have heard this similar noise in some of the places I worked as a millwright mechanic and it usually turned out to be a dry bushing in need of lube. Thanks for your comment.