Comp sprocket wear
Interestingly when one looks at the two aftermarket items and compare them to the sprocket in the 40 year old bike.
The 40 year old sprocket when made back then appears to have after maching when to a deburr bench were someone broke all the edges by hand.
That's a roller chain. With an occasional clean oil, there is not going to be much actual wear.
Harley gives a wear specs on chain with the manual adjuster to replace chain if you run out of adjuster travel. As much adjustment as there is, I bet by then you could twist the chain 90 degrees.
Now the chain can wear and get longer with all those links. If you beat on it will wear uneven and you can actually run out of being able to stay in the minimum and maximum tolerance setting.
When chain gets like that, the primary can drive you crazy with that uneven noise.
The 40 year old sprocket when made back then appears to have after maching when to a deburr bench were someone broke all the edges by hand.
That's a roller chain. With an occasional clean oil, there is not going to be much actual wear.
Harley gives a wear specs on chain with the manual adjuster to replace chain if you run out of adjuster travel. As much adjustment as there is, I bet by then you could twist the chain 90 degrees.
Now the chain can wear and get longer with all those links. If you beat on it will wear uneven and you can actually run out of being able to stay in the minimum and maximum tolerance setting.
When chain gets like that, the primary can drive you crazy with that uneven noise.
Last edited by Jackie Paper; Mar 22, 2026 at 08:15 AM.
Yes it is Bud...love it..
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