The same applies if any teeth are damaged broken. Bear in mind that alloy sprockets will wear faster than those made of steel. Of course, every rider is different so take this information with a pinch of salt and consider the other factors above. Lots of track days? In terms of miles on the bike, you are bound to need to replace them much sooner than a smooth-riding daily commuter.
Being experts in chain care, we advise replacing both the chain and sprockets at the same time to ensure both peace of mind and optimum performance delivery. Replace them! It can also consume a whole day better spent on the mountain passes! If the chain is worn, you'll reveal about half a tooth of the sprocket. A new chain will wrap around the sprocket snugly and won't pull away. The service manual for my Yamaha shows a more traditional approach for checking chains and sprockets for excessive wear.
Pulling the chain away from the rear sprocket like this is an easy indicator of worn-out parts. Other things to look for are binding or kinked links that cause tight spots put the bike on a rear stand or the center stand, if it has one, and spin the rear wheel to see if the chain maintains the same tension. Also, look for excessive rust. The front sprocket on my '70 Yamaha showing some wear. You can see the difference between the worn and new rear sprockets for the Yamaha.
If you've followed our advice in the articles and videos above about cleaning, lubing and adjusting your chain, you may find your chain and sprockets still have plenty of life left. Personally, I suggest cleaning and lubing street bike chains every other tank of fuel and more frequently on off-road bikes or after riding in wet weather. Chain tension is also very important. Too tight puts a ton of stress on your transmission bearings and seals, as well as accelerating the wear of the chain and sprockets themselves.
Adjust your chain tension as recommended in your manual or by the sticker on your swingarm or chain guard. Even the most pampered chain won't last forever, though. So if you've determined it's time for a new chain and sprockets, now what? While replacing chain drive components is a job most people can tackle at home, you have to have a way to securely lift the rear of the motorcycle to remove the rear axle and wheel.
So if you lack that, it may be worth having a local shop do the work for you. One thing to consider, if your bike is due for a rear tire soon, having the shop replace your chain and sprockets while they have the rear wheel off could save you some labor costs.
Joe loves wrenching on old bikes, especially when they have a factory center stand like this '70 Yamaha R5. Photo by Roy Kim. If you do the job yourself, determine the parts you need to order. It's never a bad idea to replace the chain and both sprockets as a set, but if you've stayed on top of chain maintenance, it's possible you could save some bucks and not have to replace both sprockets.
The rollers were loose on the rivets and I was just starting to be able to pull it away from the rear sprocket a little bit. Since I caught this early, I only needed to replace the front sprocket and chain.
The rear sprocket was showing no signs of wear, but you can see how the front sprocket is showing some wear in the photo. Irregular looking teeth that are hooked or sharp means that the sprocket is toast. The front sprocket on my KTM was just starting to show a little wear. My KTM with a new chain, front sprocket, slides and guide installed. Apparently gold chains add horsepower, so I had to get one, of course.
To give you the opposite example, last year Editor Lance replaced the chain and rear sprocket on one of his bikes, but kept the same hardened steel front sprocket because it looked OK. Unfortunately, the bike made a god-awful noise as the new chain meshed poorly with the worn sprocket. He quickly replaced the front sprocket and the noise disappeared. If you do need to replace both sprockets and the chain, what's it going to cost you? It really depends on the motorcycle you're working on.
O-ring chains have lubrication built into the links, held in by rubber O-rings between the side plates. Over-Stretched Chain stretch is normal over time, but there is only so far a chain can stretch before the links are weakened. Instead, the holes where the links attach to each other wear and get slightly larger over time, so the chain appears to expand.
For safety, make sure the motorcycle is OFF! With one hand, press down on the top of the chain to add tension. Then check the chain tension around the rear sprocket. The chain should be tight equally, all the way around the sprocket. If portions of it are loose, that means the chain is stretched.
When your chain is new you should measure the distance between links. Write it down and whenever you take the chain off to clean it measure again. When you can only fit 99 links in the same space you need to change out your chain and sprockets. Does it really matter if you ride on a worn chain and sprockets? The honest answer is yes, it matters a great deal. A broken chain while riding can be extremely dangerous. The best case scenario is when the chain breaks, you lose power, and simply pull over to the side of the road and call for a tow.
In the worst-case scenario, a broken chain can be potentially lethal, especially if it causes you to crash at a high speed. Imagine cruising at 70mph, your chain breaks and gets tangled in the rear wheel, ceasing it up.
Another possibility if for the chain to whip around your legs, ankles, and feet, potentially causing injury. Proper riding boots will help, but, any unprotected ankles or feet could end up cut or broken. A broken chain can be flung from the motorcycle into traffic, causing a hazard to other drivers. A common rule is to replace both front and rear sprockets every time you replace your chain.
This is a good rule to follow if your chain has lasted for its full life of, say, 15, miles. Nevertheless, you should inspect your rear sprocket for signs of wear during normal motorcycle maintenance days. If you were to replace your chain and keep your old, worn-down sprockets, it will wear out your new chain faster.
Likewise, if you replace your sprockets, without replacing your chain, both will wear out prematurely. So, how can you tell if your sprockets need replacement? You should replace your sprocket:. The teeth of a good sprocket should be evenly shaped, with equal space in between each tooth, and should have a flat spot at the tip, not a point.
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