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New noises??

  • Thread starter Thread starter Jerobi
  • Start date Start date
J

Jerobi

Guest
Hello everyone, I'm a real newbie when it comes to working on motors so this might be a dumb question but after cleaning and reassembling the carbs and airbox everything is running fine, much better than before actually... except I hear what I can best imagine is a slapping noise coming from the cam chain area when I'm slowing down, its really bad in 4th, and the noise goes away as soon as I pull in the clutch. Each day I ride it gets progressively more apparent. I've been looking up a lot of info on cam chain tensioners as I thought it might be that but not sure if I'm on the right track, any ideas?
 
A slapping nosie while riding is more likely your drive chain

Does the bike make the noise when you put it on the centerstand, start it up and rev it?

If not, it's not the cam chain
 
Big T said:
A slapping nosie while riding is more likely your drive chain.
Click to expand...
I have never heard a slapping noise from any of my drive chains. :-k




Oh, wait, I don't have any drive chains. :eek:

Can't make any assumptions, as the original poster has not yet disclosed what bike he is talking about. :-\\\

Jerobi, how about going into the User CP section and adding your location, then making a signature that shows your bike.
icon_shrug.gif


.
 
Sorry, thought I edited my sig but I guess it didn't work. I'm working on a '78 GS750.. Doesn't make any noise while idling or reving on the center stand tho
 
my buddy has a gs750 and if the chain is to loose it will have that slapping sound when slowing down
 
Jerobi said:
Sorry, thought I edited my sig but I guess it didn't work. I'm working on a '78 GS750.. Doesn't make any noise while idling or reving on the center stand tho
Click to expand...

I'll bet that if you check the chain while rotating the back wheel, you'll find a "tight" spot in the chain
 
If the noise goes away when you pull in the clutch while riding,
it is most certainly NOT the drive-chain.
Check that cam-chain adjuster setting.
I believe there is a rebuild tutorial in Basscliff's site if you need it.
 
Took a look and the chain was way too loose (about 4" of play) probably what was making the slapping sound. I've tightened the chain but while now while rotating the wheel on the center stand theres a spot where it gets real hard to turn. Is this because I didn't balance the wheel right and its still off center or something wrong with the chain?
 
What a bummer. I took out 5 bolts out that hold the sprocket cover on and set the gear shifter aside but still can't seem to remove the cover. Is there something else I have to remove before I can get this off
 
Also I'm not sure if the chain or sprockets have ever been replaced or serviced, highly doubtful, but there are 23,000 miles on the bike now so I'd assume it would be a good time to replace yeah?
 
Jerobi said:
What a bummer. I took out 5 bolts out that hold the sprocket cover on and set the gear shifter aside but still can't seem to remove the cover. Is there something else I have to remove before I can get this off
Click to expand...

Tap the cover around with a rubber mallet or piece of wood, should break free I would think providing all the bolts/screws are removed.
 
Jerobi said:
Also I'm not sure if the chain or sprockets have ever been replaced or serviced, highly doubtful, but there are 23,000 miles on the bike now so I'd assume it would be a good time to replace yeah?
Click to expand...

You should be able to determine how bad the sprockets are by looking at them. But you won't know how bad your counter sprocket is until you get in there.
 
Finally got into it. Sprockets don't look so bad to my very untrained eye. The tight spot occurs where theres a retaining clip on the chain that is different from all the rest. Must be something that was put there by a PO. Now that the chain is tightened is there any way to make absolutely sure my rear wheel is straight? I tried to measure from the axel to the swing arm nut but the exhaust pipes are in the way

Heres a pic of that retaining clip:
IMG_20121029_114902.jpg
 
That's the master link . Personally, I'd say your chain looks worst than my 40 year old chain on my dirt bike. Take the sprocket cover off and take a pic.
Can you see any marks on chain adjusters- just above rear axle both sides?
 
I can see that some of the links are binding, which means they don't rotate smoothly on the pin, or even rotate at all, that will sure foul up the works, create tight sections on your chain as it goes through it's rotation. You might be able to free it up once you lubricate it, but at this point it just might be toast.
 
That chain is toast, look at all the siezed links in that pic

Take another pic of the rear sprocket teeth and the front sprocket once you get the cover off

But, be prepared to get new chain and sprockets
 
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