drive chain question

[Muscle racer]

Hey guys.

As soon as I solve one probelm, another one comes up. this time its my chain.


The chain is really loose, so loose that it falls off when I turn left slowly. I followed the instructions on how to tighten it, but its still loose. So im guessing I need to replace it.  I checked the manual, but it doesnt show how to remove the chain from the crankshaft.

whats the easiest way to remove the chain???

Can I remove links from the same chain??

It says if I replace the chain, I must also replace the rear sprocket. where can I find both at a reasonable cost??

any help would be greatly appreciated.

thanks in advance

[TOOLS1]

If your chain is that bad, you need to replace it, and both sprockets. My local Honda dealer gave me a good deal on sprockets. I already had a chain. I would recommend using an O-ring chain, but use a clip type master link. That way, you will not need a special tool to install it. Also, you will be able to remove the wheel easier if, you need to fix a tire.
TOOLS

[seestheday]

I hope it goes without saying that you should not ride a bike with a chain that loose.  I'd say it is very dangerous.  A chain failing or coming off at speed could be catastrophic.

[Re-run]

What year is you cb? The 69-76 bikes used a 530 chain, the 77/78 used a 630. So you need to make sure you have the right chain and sprockets.
I can only give setup for the sohc, I dont know the others but it should be in your owners manual.
 the 69-76 is a 17/48 sprocket combo and I think the chain is 106 links.
The 77/78 is a 15/41 with 88 link chain.

You can remove the rear wheel with the chain still on, I know, I have done it. Ther is NO WAY I am getting my master link off without still using a chain breaker, it is NOT going anywhere!
You might be able to remove it off the front sprocket but I forget.
There are tons of sites to get chains and such from and there should be a sale somewhere.

[cdaiscool]

Manual for my 1981 CB750K says its a 90-link 630.

Giving input for the DOHC. Mileage may vary.

[shinyribs]

Muscle racer,you said you followed the instructions on how to tighten it and it was still loose.Did you run out of room for adjustment?If you are at the end of your adjustment then it sounds like you definitely do need a chain.

As far as getting it off the front sprocket-if you replace the chain(sounds like you will) once you cut the chain,or release the master link,just put the bike in nuetral and the sprocket will roll and you can just slip the chain out.

[Muscle racer]

My bike is a 78k.

So I have to replace the back and front sprockets?

I'll start looking online for a good price.

Needless to say, doing it my self will be way cheaper than getting a mechani, right? It sounds like a lot of work.

Is the front sprocket hard to remove?

I'm very hands and love to work on things my self, but I have a short temper, and would hate to cause further damage.

Please assist

Tks

[cdaiscool]

Download the manual from the front page. It will tell you precisely how to swap 'em out. 78 is SOHC, 79 is DOHC I believe.

Can't help you much on the actual repair; I haven't done it, and am bike stupid. So the manual will help you much more than I can!

Also, stay comfortable while working on the bike. I find I'm a LOT more patient when I'm comfortable, than when I am getting frustrated and have something poking me where I don't wanna be poked. Good luck!

[rrgunslinger]

If you can get the wheel of it's easy.

On Wed, Mar 28, 2012 at 2:44 PM, Muscle racer [via Honda CB750'S] <[hidden email]> wrote:

My bike is a 78k.

So I have to replace the back and front sprockets?

I'll start looking online for a good price.

Needless to say, doing it my self will be way cheaper than getting a mechani, right? It sounds like a lot of work.

Is the front sprocket hard to remove?

I'm very hands and love to work on things my self, but I have a short temper, and would hate to cause further damage.

Please assist

Tks

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[Dw07u]

Maybe the sprockets are still good and you just got a bad/wrong chain?

[TOOLS1]

Changing the chain, and sprockets is easy. I would however recommend, you get an impact driver (the kind, you hit with a hammer. $12.00 at most hardware stores.) to remove the screws that hold the cover on.
TOOLS

[shinyribs]

Yes! If your bike still has the factory phillips heads screws,an impact driver is a must IMO. I think they made those screws out of butter.Replace them with allen heads,will save you trouble in the future.

If you can post some pics of your sprockets we may be able to look at them and tell if they need replacing or not.

[k9shag]

How do I get the bolt holding the sprocket to loosen is there a way to hold the sprocket so it does not turn.  also is it traditional counterclockwise to loosen or reversed.  I am trying to remove the engine from the frame

[shinyribs]

Yes,it is a traditional thread.Counterclock wise to remove it. Put the bike in first gear and it should hold it tight enough to remove it. If not,and the chain is still on,hold the rear brake while in gear also.

[k9shag]

got it thanks. any tricks to removing the engine by yourself. Or is it a two person job?

[shinyribs]

I got your email/PM.Check it,or just go to this link.It's how I did mine.

http://honda-cb750-s.456789.n3.nabble.com/One-man-engine-removal-in-ten-minutes-td3248305.html

[Lucky 1]

Get rid of that 630 chain before it goes through your engine case!!!

Change to the #530 chain and sprockets. Perfect opportunity.

[Lucky 1]

Deadly in fact.

[Lucky 1]

You must use the correct phillips bit in the impact driver.
Philips #3 for those large screws.

[k9shag]

Ribs

The Ribs frame tilt method worked great thanks for all of the help.

shag