I sold my '98 M900 almost 2 years ago to an acquaintance. Just before the sale, I installed a slightly larger rear aluminum sprocket. The bike has been ridden less than 1200 miles since then. Total mileage is about 5500.
The new owner recently called me and said that a shop had told him the aftermarket aluminum sprocket "had not been installed correctly" and that he needed to replace the chain and front and rear sprockets at a cost of $300. I asked him what was wrong, and he said he didn't know. Apparently he didn't feel like getting more details from the shop, but since I installed the sprocket myself, I felt obligated to see what was going on.
I took a look at the bike, and there is definitely some strange wear as the chain has basically worn a shelf into the left side of the sprocket and the teeth are already showing a fair amount of wear. Chain tension and rear wheel alignment are fine, and the rear wheel spacer is installed correctly. The front sprocket looks great, and the chain actually looks okay too.
Has anybody seen anything like this? I didn't see anything wrong with the installation, so I'm guessing the sprocket was either the wrong size (too narrow?) or maybe the aluminum alloy was too soft.
The new owner recently called me and said that a shop had told him the aftermarket aluminum sprocket "had not been installed correctly" and that he needed to replace the chain and front and rear sprockets at a cost of $300. I asked him what was wrong, and he said he didn't know. Apparently he didn't feel like getting more details from the shop, but since I installed the sprocket myself, I felt obligated to see what was going on.
I took a look at the bike, and there is definitely some strange wear as the chain has basically worn a shelf into the left side of the sprocket and the teeth are already showing a fair amount of wear. Chain tension and rear wheel alignment are fine, and the rear wheel spacer is installed correctly. The front sprocket looks great, and the chain actually looks okay too.
Has anybody seen anything like this? I didn't see anything wrong with the installation, so I'm guessing the sprocket was either the wrong size (too narrow?) or maybe the aluminum alloy was too soft.