Solve this chain mystery
OEM chain. 0-27,800 miles
All it ever saw for cleaning and lube was WD40.
At 17K miles I replaced the front sprocket with an identical 15T from suzuki.
At about 25K miles, the chain was getting noisy and continued to get worse untill I replaced it.
There were no kinks, no signs of rust.
I was not having to adjust it.
The only reason I replaced it was the noise.
Second front sprocket looked OK, rear sprocket looked very good.
2nd chain. 27,800-45,040 miles
OEM exact replacement - D.I.D VM 8
Suzuki OEM sprockets replaced with same, along with chain.
Now we're back with the same brand new stuff we started with at 0 miles.
All this chain ever saw was used motor oil from my vstrom.
At about 42K miles (14.2K for chain) I replaced the 15T front sprocket with an aftermarket 14T.
At about 43K miles (15.2K for chain), I had 2 kinked pins.
At almost 45K miles (17K for chain) I had 9 kinked pins, some worse than others.
I cleaned the chain every day from here on out with WD40 - it did not help. The kinked pins remaned. None of the kinks involved the masterlinks.
No rust. No noise. Chain did not need adjusting. No unusual wear noticed.
Front sprocket looked ok. Rear sprocket looked very good.
I replaced this chain at 45,040 miles, for a lifespan of 17,240 miles.
This is over 10K miles difference between the 2 chains.
Both chains were kept adjusted the same.
I have a 3rd identical chain on now and going back to 100% WD40. The difference here is I'm not going to start out with new sprockets.
So, any ideas what went on with the first 2 chains - why the difference in life and the differences in how they failed, and why?