The Honda Owners Club

Hi there,

I wonder if anyone can help me?

My brother was looking at my bike this morning and noticed the chain was very "saggy", He tightened it up and off i set only now the problem is there is a VERY loud bang every now and then from the rear of the motorcycle (and no i havn't been eating too many beans ), I came home and asked my brother if he had tightened it up to tight, Been a machanic hiself he wasn't too pleased of me asking that question and he said "sort it out yourself" So now im in a big bit of a pickle basicly...

Arghh, I have no idea, Don't even know what the bang is, Someone has told me that it could be a tight spot in the chain or could be wheel baring's, My uncle has just told me it could be the chain on its way to snapping... If that snap's will it damage my engine?

Please help me if you can

Ride safe
Wendy xxx

P.S The bike is a 1992 (J) CB750

Hi Wendy

It could be that the chain is too tight. Have you a friend or another biker local to you who could have a quick look at it for you? If you put the bike on the centre stand and turn the back wheel by hand there should be no tight spots in the chain. At the tightest point you should be able to move the chain (in the centre of its run) up and down a total of about 25mm or one inch.

Hope this helps.

Regards

Chimpy

Chimp Boy wrote:Hi Wendy

It could be that the chain is too tight. Have you a friend or another biker local to you who could have a quick look at it for you? If you put the bike on the centre stand and turn the back wheel by hand there should be no tight spots in the chain. At the tightest point you should be able to move the chain (in the centre of its run) up and down a total of about 25mm or one inch.

Hope this helps.

Regards

Chimpy

Hello Chimpy,

Thank you for your reply, Much appriciated

My freind is coming round tomorow to have a look at it, I have put the bike on main stand and spun the wheel and WOW i can hardly move the rear wheel with my hands Don't think ill be riding that tomorow When i can finly find the strenth to move the rear wheel then there is a terrable sound from insside the wheel at the chain side
I can move the chain up and down abit yes, I really am confused i only know about engine's but this really does baffle me

Yes your reply has helped matie, wonder why the rear wheel is so stiff now to move

Ride safe
Wendy xxx

Sounds like the chain has one or more tight spots in it and the tension has been set at one on the slack areas.

Consequently when it gets to a tight spot it locks up. If you continue to ride you could cause damage to the wheel and final drive bearings or worse still the chain could snap causing damage to casings and even you. You're right not to ride it.

Only cure is a new chain and sprockets and then regular maintenance and it should last for many miles.

Dave M wrote:Sounds like the chain has one or more tight spots in it and the tension has been set at one on the slack areas.

Consequently when it gets to a tight spot it locks up. If you continue to ride you could cause damage to the wheel and final drive bearings or worse still the chain could snap causing damage to casings and even you. You're right not to ride it.

Only cure is a new chain and sprockets and then regular maintenance and it should last for many miles.

Hello Dave, Thank you for your reply I do try to look after the chain and sprockets but these ones on this bike seem to have "had it" they are buggered (sorry about the language), My freind is coming down this morning sometime (any muinite now) with a new set of DID chain and sprockets (hopefully) and taking the bike to his workshop but i AM riding it there *bites nails* (really bad rain today) it isn't far to ride though TBH its bout 7 miles so should hold up ok, There are no fast roads there just 20s and 30s and one 40 zone but i think i will be taking it easy on there too..
I was reading about what could happen with the chain and if it snapped it said they have a habbit of hitting legs That mixed with britail bone disease does NOT match so will be wearing extra padding on my left leg and then it goes on to snap the crank case (or whatever it is) and that not goooood

So will be taking it VERY easy, Shame realy

But can't wait to get my new chain on her

Ride safe
Wendy xxx

Could be a combination of events..Overtightening the chain and by chance at a slack area could have resulted in excessive strain to already worn wheel bearings which have failed hence the 'bang'...dont ride it again till someone checks it out thoroughly as it may be dangerous now!

..Cant really see how a worn chain would make such noises, If you can wiggle the chain excessively at the rear sprocket its probably needing replacement....check the teeth of the sprocket as well for wear and signs of missalignment.

Also get your mate to check crush rubbers as these could be warn too

Cush rubbers worn or gone? That would account for some noise on take up in the throttle during acceleration. Sprocket knackered would give movement in the chain again when tension changes. Rear Brake sticking on could account for stiff wheel movement and if sticking the bang or clatter sound. Sounds Wendy like you need a good rear end service ---- OOh err Missus! ----- but I think you know what we mean.

What mileage has your CB done. I had one of the '92 models and did 72,000 before selling it. I did replace wheel bearings after 60,000 and chain was maintained with a Scott Oiler so chains and sprockets did 30,000 or more each set.

Let us know what happens.

By the way bearings were readily available and not difficult or expensive to fit.

When the chain was adjusted it may be that the wheel alignment was not correctly set. If the sprockets are out of line the chain will try and jump causing a loud bang.

Regards

Chimpy

Chimp Boy wrote:When the chain was adjusted it may be that the wheel alignment was not correctly set. If the sprockets are out of line the chain will try and jump causing a loud bang.Chimpy

..Ive never known that Chimpy.....the alignment must be seriously out for that to happen surely (almost incompetently out I would say) I think between us we have come up with just about every possibility! Interesting now to see what the problem is! Wendy, please let us know the final outcome!?

i had a simular problem when i first brought my old bike,

changed the chain and sprockets and all was ok afterwards,,,,

some of the teeth had started to wear away.

Bev

Brother had a look today,

Found out that the front sprocket was missing a tooth and the rear break pads were metal on metal so just got a new sprocket and new breaks and now...... Still not done But my brother is going to do this after he comes home from work
The cush drive's are fine they look brand new as do wheel bearing's

Take care and THANK YOU ALL SO MUCH for all your advice and your replies

Ride safe
Wendy xxx

Sounds like this is a well looked-after machine, with no expense spared on it's maintenance. Not.

Red V Four wrote:Sounds like this is a well looked-after machine, with no expense spared on it's maintenance. Not.

Thats a little harsh but it does seem to point to minimal maintenance and I would certainly recommend that the whole machine is inspected. what about front brakes? tyres, clutch and brake lever, suspension etc