Author Topic: 1977 750 DRIVE CHAIN (clicking noise after adjustment)  (Read 3665 times)

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Offline Sitarz84

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1977 750 DRIVE CHAIN (clicking noise after adjustment)
« on: August 07, 2012, 04:43:18 AM »
I did some investigating on my drive chain. I adjusted it the other day because there was
too much slack on it. Minimum is 5/8 in and I noticed I was at about 1.5 in.
After the adjustment I took it out for a ride and when I came back I walked the bike into the garage.
As I was walking it I noticed a clicking sound.
I put the bike on the center stand and spun the back tire with my hand and noticed that within
each revolution the chain was tighter in a certain spot and more loose in another.
The tire obviously didnt turn as freely in the spot where the chain was tighter.

I checked to see if both sides of the drive chain indicators were on the same spot and they matched up
very very close.

My question is why does the chain get tighter in one spot?

thanks

Offline Terry in Australia

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #1 on: August 07, 2012, 04:55:56 AM »
G'Day Mate, be very careful not to "over tighten" your chain or you'll ruin your countershaft bearings, and they'll make an annoying clicking noise as they slowly disintegrate..............  Rather than me waffle on about correct maintenance, chain tension etc, have a read of this article, it seems pretty good at a glance, and answers your questions. Cheers, Terry. ;D

http://canyonchasers.net/shop/generic/chain.php
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So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Sitarz84

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #2 on: August 07, 2012, 05:32:09 AM »
awesome link....I'm afraid I may have overtightened the chain a bit. The problem is that I wasnt able to bring the settings back. I'm able to tighten but not loosen it.

Offline MCRider

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #3 on: August 07, 2012, 06:27:37 AM »
awesome link....I'm afraid I may have overtightened the chain a bit. The problem is that I wasnt able to bring the settings back. I'm able to tighten but not loosen it.
A great article. I read it and may have missed these points, but they'd bear repeating. When you notice the chain getting tighter and looser, that is because in one section of the chain there has been more wear (stretch) than another and as it revolves it gets tighter and looser. This comes from an inconsistent lubing of the chain. If its an ORingchain, perhaps ther has been a section of ORing failures. Nevertheless it is not recoverable and you're in line for a new chain.

The article did mention this, though not completely, test for a  worn chain. With the bike on the centerstand, in neitral, press up on the bottom row of the chain. Now at 3:00 O'clockon the rear sprocket, pull the chain away from the sprocket. If you see daylight between the chain and the sprocket it (and possibly the sprckt) are shot.  In your case, youcan do this at different points on the chain and probably notice some sections pull away more than others, since you have the "tighty loosey" condition.

Finally, when you adjust the chain, it should be done with weight on the bike. As the wheel moves up, it gets further away from the engine. You want to adjust it at the furthest point. It may take 2 people to do this. Then once its adjusted, put it on the centerstand and note the slack. It will probably be much more, but thats OK cuz you know at its tightest point its OK. From then on you'll adjust it on the CS at the slack specific for your bike.

Since you have the tighty loosey condition, until you can score new chain and sprckts, you should adjust the chain at its tightest run.

Or so I think.   :D
Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline Sitarz84

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #4 on: August 07, 2012, 06:45:40 AM »
Wow....thats the best advice I've had so far. Seriously thanks.
So if I overtighten how do I correct that? So far I've been unable to bring it back.

Offline madmtnmotors

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #5 on: August 07, 2012, 06:51:37 AM »
Wow....thats the best advice I've had so far. Seriously thanks.
So if I overtighten how do I correct that? So far I've been unable to bring it back.


Back off the adjusters first, then loosen the axle nut, shove the wheel forward (don't shove it off the centerstand though!), snug the axle nut (just snug to add some holding friction, not final torque), begin adjustments again. Once it's right then torque the axle nut and recheck. Repeat as often as necessary.
« Last Edit: August 07, 2012, 07:04:25 AM by madmtnmotors »
TAMTF...


Wilbur



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Offline MCRider

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #6 on: August 07, 2012, 06:59:50 AM »
Wow....thats the best advice I've had so far. Seriously thanks.
So if I overtighten how do I correct that? So far I've been unable to bring it back.

What he said.  :D
Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline Sitarz84

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #7 on: August 07, 2012, 08:31:02 AM »
OK right on....thats kind of what I thought but wasn't sure. If I loosen the axel nut then does that mean my alignment
will likely be off once I'm ready to tighten everything down again?

You guys are badasses by the way....this helps a ton

Offline madmtnmotors

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #8 on: August 07, 2012, 08:34:15 AM »
If I loosen the axel nut then does that mean my alignment will likely be off once I'm ready to tighten everything down again?

Yes. Alignment is addressed as you tension the chain. Use the hash marks on the swingarm as a guide while you tension/align the chain.
« Last Edit: August 07, 2012, 08:49:59 AM by madmtnmotors »
TAMTF...


Wilbur



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Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
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http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
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Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
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Offline DJ_AX

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #9 on: August 07, 2012, 08:48:51 AM »
.... (don't shove it off the centerstand though!) ...
I almost did that once... scared the bejesus out of me!

To move the wheel forward, after loosening the axel nut and the tensioners you can also push the tire side to side a bit to kind of walk it forward. You can also use the chain... (push it hard like you're checking the tension, only harder) to pull the left side forward... push the rear brake to pull the right side forward.

Also  when I've got it lined up and just making minor adjustments... I count the flat spots on the adjuster nut as I turn.. turn the left and right equally. Most of the time they only need to turn one or two flat spots (1/6th+) to make the adjustment.

~ Vincent . . . '75 CB750 K5 . . . '97 BMW r1100rt . . . had; '75 CB550 K1 (sold) . . .  '73 CB350G (gifted) HELL YEAH!
Disclaimer: I could be wrong. :)

Offline lucky

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #10 on: August 07, 2012, 08:51:30 AM »
When you adjust your chain you need to be sitting on the motorcycle when you check the slack. When your weight is on the motorcycle the swing arm moves towards being level and that is when the chain is stretched out the most .

When your weight is off of the motorcycle the swing arm is not level and the chain is shorter. And the chain is loose.

The clicking noise is not the countershaft bearing usually.
The clicking noise is from the chain not making contact with all of the teeth
on the sprockets with the same amount of distance between rollers.
It is a sign of worn out chain and the sprockets may not be concentric anymore.
It is called tolerance stack up.
All of the little thousandths of an inch of out of roundness looseness etc.,. add up.

It needs to have new sprockets possibly AND a new chain. The two sprockets and chain all start out life together. If the chain gets dry in one spot and is tight then the sprockets start to get worn unevenly.

You probably need at least a new chain and new FRONT sprocket. The front sprocket can get out of contricity much faster that the rear sprocket.

IF any teeth on the sprockets are curved they need to be replaced.
Inspect the chain for rollers that are cracked also.

Offline madmtnmotors

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Re: 1977 750 DRIVE CHAIN (clicking noise after adjustment)
« Reply #11 on: August 07, 2012, 08:52:53 AM »
.... (don't shove it off the centerstand though!) ...
I almost did that once... scared the bejesus out of me!

I had to edit my post and add that advice... since I've nearly done it too!  :o
TAMTF...


Wilbur



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"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

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