72 CB350 and JT Sprockets

[fairfield]

Just got my sprocket set from JT Sprockets. As I was getting ready to install the new one on the rear, I hit a snag. The picture describes it better than I can. The lip on the new one is smaller than on the old one. Anyone ever encounter this?

JT lists the sprocket as a replacement...

http://www.jtsprockets.com/52.0.html?&L=0&sel_uid=292&p=

 

[Rocan]

does it not mount up ok?

 

[wfo guy]

As long as the number of teeth, offset, and mounting areas are the same, the rest is not important. Everytime I have changed brands there has been differences in machined areas. If I have missed what you are asking, elaborate.

 

[fairfield]

It fits great on the hub, all 4 holes lineup.

The issue is that the lugs that you see on the photo have threads on the other side. The notch on the lug fits tightly against the lip on the original sprocket in order to tighten the nuts without taking off the hole assembly.

Maybe this isn't an issue but I wouldn't want anything to happen to the sprocket while I was riding...

 

[wfo guy]

Is there enough threads exposed to put a thin jamb nut on them?

 

[fairfield]

There isn't a lot of thread at all. The nuts are held in place once tight with those foldable tabs.

 

[tweakedlogic]

I still do not understand the issue. I've been staring at the pic for several minutes trying to figure it out. The original lugs are not threaded on the other side? Can you use the original lugs? Or are the new lugs too short?

 

[fairfield]

Sorry for not being too clear. The lugs are old and have threads on the other side.

If you look carefully at the pic, you'll see a notch on the lug where it meets the sprocket. On the old sprocket, it prevents the lug from turning when tightening the nut on the other side. On the new sprocket, the lugs turn freely so that I would have to secure them on the side shown while tightening on the nut side.

The lip prevents the lug from turning once the sprocket is installed on the hub. This might not be an issue as there is a tabbed washer preventing the nuts from turning and a circlip holding the sprocket to the hub. If the lug ever got loose, it could turn maybe half a turn before bottoming out in the hub.

I can take more pics if things aren't quite clear yet.

 

[fairfield]

Alright, I talked to a local bike mechanic and he said to use red loctite on the nuts and I'll be good to go.