Chain is slipping and jumping gears

No, they do not - a chain tool has to be used. Also, a 10 speed (2 gears in front, 5 in the rear) would be quite old, so the rear gear cluster (freewheel) will be worn as well as the chain, and also takes a specialized tool to remove. Replacing both on a Huffy will cost more than the bike is worth.

Sometimes all it takes is a master link or "quick link," but you can't count on that. How to fix it depends on several factors. There are different chains for the various number of cogs/gears on the rear of the bike, and an older chain may require a different procedure than a newer one. Further, if the chain is badly worn it may need to be replaced, but then may not mesh well if the gears aren't replaced as well. Finally, just taking out the rest of the link (one full link is one outer and one inner) may make the chain too short, which could damage the bike.

It's best to take the chain and bike into a bike shop, or a bike co-op if there's one available. If you really want to know all the in's and out's see this link: Chain Maintenance

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

Tight chains cause all manner of problems, not heard of this one before but I would suggest the best option is to find out how many links are in the chain originally fitted by the manufacturer. Chains are quite cheap I would get the right size and length and fit it and see.

Good luck.

The rear derailleur needs adjusting, once to establish limits (so it can't go past high gear or low gear). Everything else is up to you fine-adjusting the shifter to make the bike run quietly. If you're careless about your gear changes, you'll get MOSTLY into one gear but not quite perfectly, so the bike is always trying to start shifting into another gear - that's the sound you hear, the sensation you feel. Fine-tune your shifter positions each time you shift - you'll find a "sweet spot" where the bike runs almost perfectly silently.

No, they can't readily do that at the factory, not with chain drives. There are just too many things that can affect gear changes, and things are in a slightly different position every time you remove & replace the rear wheel, or even loosen & retighten it. Unless you're ready to spend vast dollars on a foolproof shifter system, shifting cleanly is going to be your job and your job alone. It's one measure of your bike riding skill... and the better you get at that skill, the better you feel about it.

...and your bike will like you for it.

one of 2 things.if your spockets are worn the travel distance has shortened and where the master link connects replace the link that connects it with a half link.also is there chain tighteners on it?if so and they are on both sides of a spocket or just 1?if there are 2 they must be tightened together in unison and not 1 side or the other as that will throw the correct alignment on the chain and it will jump the spocket.also check the spocket alignment to make sure that is correct.

If the chain broke and thus fell off the bike compleatly, take it to the bike shop for a SRAM master link to be installed. Should be about 5 bucks. If it is still intact but isn't on the gears, just shift to a gear farthest away from where the chain came off.

You haven't actually asked a question, so I am guessing that you want to know how to replace a bicycle chain on a 21 speed bike. To remove the chain you need to use a chain tool that presses one of the pins out of the one of the chain links (any link, there is no master link). To put the new chain on you use the chain tool to press the pin in. This is just a little tricky with a chain tool, but it's just about impossible without it. They sell these tools at bike shops and maybe even at Wal-mart. Take a look at this link to see a what I'm talking about. http://www.parktool.com/blog/repair-help/chain-installation-derailleur-bikes By the way, Park tools are very good quality for the money.

if the bike has gears it does not have a master link, that is for single speed bikes only.

You will need an 8spd chain for your bike (1/2" x 3/32), these will fit any 6,7 or 8 spd bike. This requires a special tool to install ($8-$25), I would recommend taking into a bike shop and have them do it if you have no experience with this type of chain.

Side note: if you do own the tool, you can repair a broken chain for a temporary fix in the future, so may be worth buying. Check around, many bike shops offer basic repair classes and cover this.

It's possible that you have the bike in a gear combination that it should not be in. It's a little hard to explain here but I'll give it a try. There are certain combinations of gears that cause the chain to be a bad angle to the front and rear gears. If you are in a front such that the chain on the front gear is closest to the bike frame center and the chain on the back gear is furthest from the bike frame center, it means that the chain is at a too severe angle to the gears and that the chain may slip. The reverse is also true. If the chain on the front is on the gear furthest from the bike frame center and on the gear in the back closest to the bike frame center, you will have the same problem. In summation, this means that not all gears in the rear should be used with all gears in the front. This isn't a great explanation but you should be able to find some articles about appropriate gearing combinations on the internet. It is also possbile that your derailleurs are out of adjustment or that your chain has a stiff link as well as several other problems. I'd focus on the gearing and see if that solves the problem. Good luck!

If it has not broken or jumped timing you simply remove the valve cover and timing chain tennsioner. Then cut a link out of the old chain on top of the cam gear, then you attach the new chain with the supplied master link and slowly rotate the engine until the old chain has run out and the new chain is in it's place. It's best to have a helper to rotate so you can hold the chain against the cam gear. Once this is done recheck the can timing and do not let the chain slip or you will have to pull the injection pump and retime it. Even if you do it's easier than removing the front cover! Good luck!