20-07-14, 05:45 AM
A bit of a warning, replacing a chain and sprocket isn't the hardest thing in the World to do but things can go wrong so I hope you've got a bit of experience/common sense with tools. What I'd do is first try and crack the front sprocket nut off as that's arguably the hardest part to do and if you do the nut first and it goes wrong you've still got a rideable bike that you can bring to a bike shop. If you've got an impact gun it should be a doddle to get it off. If not put the bike on the ground, put it in gear and lock the back brake and give the nut a good heave with a pipe on the end of your ratchet. Hopefully it'll undo and your threads will be in good condition. If it doesn't come undone and it's seized on you need to be very careful not to give it too much force and damage the nut. If you can't get it undone bring it to a bike shop and ask them to rattle it off. The other possibility is that the nut has already spun itself off :lol
If you get the front nut off you can move onto the rear sprocket nuts. Again lock the back wheel and undo the rear nuts with a pipe on a ratchet if you need the extra leverage. Some heat and penetrating oil will help. Once you've got everything loose then brake the chain. You'll obviously have to take the rear wheel off next to get the rear sprocket off so it's a good time to give everything a clean and grease where it needs it.
You should get the larger front sprocket nut and new tab don't reuse the old ones. Reassemble everything and use Loctite on the front and rear sprocket nuts. Torque them to spec using a torque wrench. Tighten the rear sprocket nuts gradually in a crisscross pattern like it says in the workshop manual. I assume you're using a rivet chain? If so they can be fiddly, don't expect to get it perfect the first time you rivet the link, just do a bit then check it, then do a bit. That's just a rough idea of what I'd do, it's not a how to. Use your common sense and stop if you think you're doing damage. To answer some of your questions you don't need to remove the clutch cable just let the cover dangle. You don't need to soak the chain in grease just oil it as normal when it's all together. Best of luck with it
If you get the front nut off you can move onto the rear sprocket nuts. Again lock the back wheel and undo the rear nuts with a pipe on a ratchet if you need the extra leverage. Some heat and penetrating oil will help. Once you've got everything loose then brake the chain. You'll obviously have to take the rear wheel off next to get the rear sprocket off so it's a good time to give everything a clean and grease where it needs it.
You should get the larger front sprocket nut and new tab don't reuse the old ones. Reassemble everything and use Loctite on the front and rear sprocket nuts. Torque them to spec using a torque wrench. Tighten the rear sprocket nuts gradually in a crisscross pattern like it says in the workshop manual. I assume you're using a rivet chain? If so they can be fiddly, don't expect to get it perfect the first time you rivet the link, just do a bit then check it, then do a bit. That's just a rough idea of what I'd do, it's not a how to. Use your common sense and stop if you think you're doing damage. To answer some of your questions you don't need to remove the clutch cable just let the cover dangle. You don't need to soak the chain in grease just oil it as normal when it's all together. Best of luck with it