Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: El__burro on September 25, 2015, 03:08:11 PM

Title: Chain problem
Post by: El__burro on September 25, 2015, 03:08:11 PM

Good day.
I made the rear wheel spin a bit and soon realised that something is wrong.
Looking at the chain something is not right.
Can you tell me if you can see something wrong. I think is the chain link.

Thanks
El__burro

Title: Re: Chain problem
Post by: 750rideruk on September 25, 2015, 05:22:31 PM

chain looks tottally fubarred

Title: Re: Chain problem
Post by: Nurse Julie on September 25, 2015, 08:50:35 PM

Well, I'm no expert but that chain looks completely shot to pieces to me. Why not treat yourself to a new chain and sprocket kit, it will be worth it in the long run (which is something you won't get out of that chain)  ;D ;D ;D ;D ;D

Title: Re: Chain problem
Post by: hairygit on September 25, 2015, 08:59:34 PM

Agree with Julie on that one (surprised myself there!) Get a new chain and sprocket set, and keep it well lubed and adjusted, if a 750 snaps it's chain under load it can destroy the crankcases in a split second (seen more than a few do it over the years! )

Sent from my D2303 using Tapatalk

Title: Re: Chain problem
Post by: Nurse Julie on September 25, 2015, 09:06:41 PM

Quote from: hairygit on September 25, 2015, 08:59:34 PM

Agree with Julie on that one (surprised myself there!)
Sent from my D2303 using Tapatalk

 ;D ;D ;D ;D ;D

Title: Re: Chain problem
Post by: mike the bike on September 25, 2015, 09:33:07 PM

It happened on my GS1000, Don't risk it.

Title: Re: Chain problem
Post by: MCTID on September 25, 2015, 10:40:56 PM

Some years ago I had my ZXR1200 (I know...... I'm sorry) in for a service at Fins in Redhill. When I picked it up and was paying, there was a chap at the counter bemoaning his bad luck that his Aprillia Mille had thrown its drive chain and locked the rear wheel on the M25 when he was doing about 100MPH. Luckily when it blew the tyre and see sawed down the road he managed to stay on and he lived to tell the tale. I could see that the Service Receptionist was a bit peeved at this Guy as he just wanted to scrounge the loan of a 19mm Allen Key to fix his bike, so he calmly mentioned that he should have followed my good example when having my bike serviced and that I had asked them to change my 12K mileage chain for a new one. I just smiled and said that £80 was a small price to pay for piece of mind. The Guy looked a bit sheepish and promptly shut up.

Moral of the story: is your life worth the price of a new chain and/ or sprockets. You're dead right it is.

Title: Re: Chain problem
Post by: El__burro on September 25, 2015, 11:04:19 PM

Thanks for your advices.
Need a new chain and sproket.
What should I go for.

Thanks
El__burro

Title: Re: Chain problem
Post by: MarkCR750 on September 25, 2015, 11:07:49 PM

You can't beat busters!, not sure which model yours is but they do a kit for various years.

http://www.ebay.co.uk/itm/CB750-K-Sohc-1976-K6-O-Ring-Chain-and-Sprocket-Kit-/300572972891?hash=item45fb8b975b

Title: Re: Chain problem
Post by: El__burro on September 25, 2015, 11:16:51 PM

Price wise is ok,
Quality wise?
Mark thanks,the link is for k4 is it the same as K2 (mine)?

Thanks
El__burro

Title: Re: Chain problem
Post by: MarkCR750 on September 26, 2015, 08:03:17 AM

Quality wise it will be better than whatever Honda fitted 😀, you could get.a more expensive set but given that it's only got to deal with 67bhp what's the point, you can email them through the eBay page and ask if it will fit yours, they are very helpful.

Title: Re: Chain problem
Post by: El__burro on September 26, 2015, 08:56:05 AM

Thanks, I'll do.
El__burro

Title: Re: Chain problem
Post by: MCTID on September 26, 2015, 09:10:48 AM

Busters and M&P (I think they are possibly owned by the same outfit) are both very good, and their chains/ sprockets are good value for money at approx £80.

As always....see what else you might need (brake pads/ shoes, bulbs, cables etc) and save on postage.

I ask for this kind of stuff for Xmas/ Birthday pressies off my family otherwise I get things I never use (I have drawers full of tat...........you should see the Reindeer xmas jumper one of my darling Daughters bought me last year....DOH).

Title: Re: Chain problem
Post by: El__burro on September 26, 2015, 01:57:34 PM

done.
just bought the Buster one, the K2 is the same price £69.99 free delivery.
cant wait to fit it then only rear tyre to replace.

thanks
el__burro

Title: Re: Chain problem
Post by: El__burro on October 08, 2015, 03:09:12 PM

Chain and sprockets arrived, a week late but they eventually did.
I put on the rear sprocket and new chain but kept the old front sprocket as I am not sure how to replace it.
After having completed the job I have realised that the chain is very loose, i pushed the wheel to the very end but still way too lose.

Shall I cut some links off the chain or..

thanks
el__burro

Title: Re: Chain problem
Post by: MarkCR750 on October 08, 2015, 04:03:06 PM

Is the front sprocket currently fitted the correct one?, has it the same number of teeth as the one that arrived in the new kit?

Title: Re: Chain problem
Post by: El__burro on October 08, 2015, 04:21:15 PM

Not sure, I guess it's probably a stock 18; rear is 48.
Still it wouldn't make that much difference.
What's the k2 chain lenght?

Thanks
El__burro

Title: Re: Chain problem
Post by: Chris400F on October 08, 2015, 05:08:03 PM

DS part is 100 links
http://www.davidsilverspares.co.uk/CB750K2-FOUR-1972/part_104917/

Title: Re: Chain problem
Post by: El__burro on October 08, 2015, 05:21:29 PM

I'm going to count the links on the old one.
Do the 106L on the chain box means 106 links?

Thanks
El__burro

Title: Re: Chain problem
Post by: mike the bike on October 08, 2015, 07:07:46 PM

Yup

Title: Re: Chain problem
Post by: El__burro on October 08, 2015, 08:05:52 PM

I guess the supplier has got mistaken the box says 106 but it could be 104 as there is another sticker.
Sent a message to the supplier hopefully he would sort it asap.

thanks
el__burro(http://images.tapatalk-cdn.com/15/10/08/b26bedd1fc67ad03f4e616f2c8c5d9af.jpg)

Title: Chain problem
Post by: El__burro on October 09, 2015, 11:45:42 AM

A bit of headache with the supplier.  He's saying that the 100 link chain is for the US market (picture in blue) and 104 for EU (picture in black).

What's the real (http://images.tapatalk-cdn.com/15/10/09/0fca9bf7c880cc6dc39e27fae4775b0a.jpg)(http://images.tapatalk-cdn.com/15/10/09/5f7a07bc00e8c2a9b428e7b0defa1cce.jpg)story?
Thanks

Title: Re: Chain problem
Post by: hairygit on October 09, 2015, 12:47:58 PM

Motor vehicles in the u.s. have emmissions per mile measured, and it is actually illegal to deviate from the manufacturers original spec, even when the manufacturer does modifications owners must stick to what was originally fitted. It is actually a federal offence to fit alternative size sprockets to a bike to improve performance as that would alter the emissions per mile, an offence under e.p.a. regulations. It seems ridiculous that they enforce such stupid rules. and then march uninvited to other countries and start firing depleted uranium shells and bombs at them. Land of the free? I don't think so!

Sent from my D2303 using Tapatalk

Title: Re: Chain problem
Post by: El__burro on October 09, 2015, 12:52:19 PM

so, is it 100 link EU, US or generic?
the old chain is 100, new one is 104 and way too long.
seller wont take it back as he thinks is in the right.
DSS sells a 100 link ones (as per link above).
thanks
el__burro

Title: Re: Chain problem
Post by: Bryanj on October 09, 2015, 12:55:07 PM

As long as you have a split link just shorten it

Title: Re: Chain problem
Post by: MCTID on October 09, 2015, 02:17:46 PM

The Seller obviously won't admit that the mistake is his.........they never do.....but why not ask if you can return it for an exchange and you'll split the postage (or you'll pay it if you are really desperate).

Good luck.

Title: Re: Chain problem
Post by: totty on October 09, 2015, 03:33:09 PM

It's so easy to shorten I wouldn't bother with a return.

If you don't have the right tool then just grind the head off a pin then tap it out with anything appropriately sized - even a nail will do.

Title: Re: Chain problem
Post by: El__burro on October 09, 2015, 04:00:56 PM

Thanks, it would save me £5.50

Title: Re: Chain problem
Post by: mike the bike on October 09, 2015, 04:54:24 PM

If you put in a vice with an M6 nut behind the rivet, you can press the rivet out using the force of the vice just to start it off and then use a punch on it.

Title: Chain problem
Post by: El__burro on October 09, 2015, 08:10:27 PM

After grinding off both ends i used the old chain link to push it through with a vice using a large bolt on the other end;
that worked fine.
next..
How easy is to replace the front sprocket?
thanks
el__burro

Title: Re: Chain problem
Post by: hairygit on October 09, 2015, 08:19:23 PM

Very! Remove the two short bolts from the locking plate, turn it slightly and it will align with the splines and can be pulled off, then the sprocket just lifts off. Put the new sprocket on, and fit the locking plate, rotate it until the bolt holes line up, then replace the bolts. And yes, it is meant to wobble about when fitted!

Sent from my D2303 using Tapatalk

Title: Re: Chain problem
Post by: El__burro on October 09, 2015, 08:48:35 PM

Quote from: hairygit on October 09, 2015, 08:19:23 PM

Very! Remove the two short bolts from the locking plate, turn it slightly and it will align with the splines and can be pulled off, then the sprocket just lifts off. Put the new sprocket on, and fit the locking plate, rotate it until the bolt holes line up, then replace the bolts. And yes, it is meant to wobble about when fitted!

Sent from my D2303 using Tapatalk

thanks, but i meant the step just before that.
what covers I need to remove first?

Title: Re: Chain problem
Post by: hairygit on October 09, 2015, 08:51:48 PM

Just the small rearmost cover over the sprocket, held on with 2 screws. You do not need to remove the gearlever  or the cover under it

Title: Re: Chain problem
Post by: El__burro on October 09, 2015, 08:53:17 PM

Thanks, I'll try tomorrow.

Title: Re: Chain problem
Post by: royhall on October 10, 2015, 09:57:12 AM

Quote from: El__burro on October 08, 2015, 03:09:12 PM

Chain and sprockets arrived, a week late but they eventually did.
I put on the rear sprocket and new chain but kept the old front sprocket as I am not sure how to replace it.
After having completed the job I have realised that the chain is very loose, i pushed the wheel to the very end but still way too lose.

Shall I cut some links off the chain or..

thanks
el__burro

Same here. Just had a chain and sprocket kit off eBay from M&P for the CB750F2 
http://www.ebay.co.uk/itm/HONDA-CB750-F2-1977-SOHC-O-RING-CHAIN-AND-SPROCKET-KIT-/271025338194? (http://www.ebay.co.uk/itm/HONDA-CB750-F2-1977-SOHC-O-RING-CHAIN-AND-SPROCKET-KIT-/271025338194?) 

Fitted it last weekend and like yours the adjustment is past half way. So tomorrows job is to remove the required links and put in a soft rivet link. Don't like split links on 630 chain, although I don't know of any problems so I'm probably being way over cautious. Was always told from my teenage years that 65hp was the limit for split links (this may have been true of 70/80s chains). Its probably bullshit but what price your crankcases if it breaks.

Not even going to bother with the ringing M&P as they will only say "we've sold thousands and this is the first report of a problem". That will just piss me off. So out with the link remover again.

Title: Re: Chain problem
Post by: mike the bike on October 10, 2015, 11:19:25 AM

If you've got a link splitting tool, why bother with the soft link? Couldn't you just join the two ends together,  deleting the split link.

Title: Re: Chain problem
Post by: MarkCR750 on October 10, 2015, 11:32:07 AM

Quote from: royhall on October 10, 2015, 09:57:12 AM

Quote from: El__burro on October 08, 2015, 03:09:12 PM

Chain and sprockets arrived, a week late but they eventually did.
I put on the rear sprocket and new chain but kept the old front sprocket as I am not sure how to replace it.
After having completed the job I have realised that the chain is very loose, i pushed the wheel to the very end but still way too lose.

Shall I cut some links off the chain or..

thanks
el__burro

Same here. Just had a chain and sprocket kit off eBay from M&P for the CB750F2 
http://www.ebay.co.uk/itm/HONDA-CB750-F2-1977-SOHC-O-RING-CHAIN-AND-SPROCKET-KIT-/271025338194? (http://www.ebay.co.uk/itm/HONDA-CB750-F2-1977-SOHC-O-RING-CHAIN-AND-SPROCKET-KIT-/271025338194?) 

Fitted it last weekend and like yours the adjustment is past half way. So tomorrows job is to remove the required links and put in a soft rivet link. Don't like split links on 630 chain, although I don't know of any problems so I'm probably being way over cautious. Was always told from my teenage years that 65hp was the limit for split links (this may have been true of 70/80s chains). Its probably bullshit but what price your crankcases if it breaks.

Not even going to bother with the ringing M&P as they will only say "we've sold thousands and this is the first report of a problem". That will just piss me off. So out with the link remover again.

Surprised at M&P's response Roy, I only ever had good service from them, but it just goes to show that all suppliers can be a problem once they've got the cash!, regarding split links yes you are being over cautious, but why not when its so easy to use the soft link, if anybody does want to use a split link though they shouldn't worry, I've seen them used on 500bhp drag bikes without an issue, there should be no side loading on a chain so the split link doesn't take any stress, I use a split link on my XJR1300.....famous last words? :)

Title: Re: Chain problem
Post by: royhall on October 10, 2015, 11:33:29 AM

That's the plan Mike. The rivet over link that I bought is called a Soft Link, as the ends of the link that get riveted over are soft so they can be worked easily. Probably me not making myself clear again. ::)

Title: Re: Chain problem
Post by: royhall on October 10, 2015, 11:38:54 AM

Just want to be clear on this Mark.

I didn't ring M&P as El-Burro had tried and got that response.

I to have never had a problem with M&P and I don't really consider this a problem as I can just shorten it so not worth the trouble ringing. If it had been too short I would have been on the phone in a second.

Just mentioned it as it was the same as El-Burro's problem.

I have a split link fitted at the moment, but the spring keeper on it is not tight and moves around slightly. That makes me nervous about it.

Title: Re: Chain problem
Post by: mike the bike on October 10, 2015, 11:56:03 AM

I know what a soft link is, I use them when replacing cam chains.  I was wondering - why bother.  if you're going to remove links anyway, why not just join the chain together?

Title: Re: Chain problem
Post by: royhall on October 10, 2015, 12:02:48 PM

Quote from: mike the bike on October 10, 2015, 11:56:03 AM

I know what a soft link is, I use them when replacing cam chains.  I was wondering - why bother.  if you're going to remove links anyway, why not just join the chain together?

Not sure I understand Mike sorry. Join the ends together with what, isn't that what the soft link does?

Title: Re: Chain problem
Post by: mike the bike on October 10, 2015, 02:10:22 PM

Make it into an endless chain using the link removal tool is what I meant.

Title: Re: Chain problem
Post by: El__burro on October 10, 2015, 04:01:33 PM

Eventually the people at Busters kindly offered to shorten the chain and send it back too for free, all I had to pay £5.50 for sending the chain to them.
I just think that they should mention on their page to choose EU or US models.
Considering how easy is to shorten, it's not(http://images.tapatalk-cdn.com/15/10/10/0abb22e908dd60b16d5061667889ecd7.jpg) worth leaving a bad feedback (the delivery was a week late too).
Price/quality ok.

By the way, chain and both sprocket are on.
Just need a test ride.

Thanks
El__burro

Title: Re: Chain problem
Post by: MarkCR750 on October 10, 2015, 07:51:36 PM

Looks a bit tight in the photo?

Title: Re: Chain problem
Post by: Trigger on October 11, 2015, 01:10:04 PM

Quote from: MarkCR750 on October 10, 2015, 07:51:36 PM

Looks a bit tight in the photo?

Maybe it will need 1 link putting back  ;D ;D ;D

Title: Re: Chain problem
Post by: mike the bike on October 11, 2015, 03:38:56 PM

1 pair.   You can't have 1 extra link.

Title: Re: Chain problem
Post by: El__burro on October 11, 2015, 05:21:55 PM

not sure if I should laugh along.
when i removed it from the stand got a bit better.
what should it look like?
thanks
El__burro

Title: Re: Chain problem
Post by: mike the bike on October 11, 2015, 06:26:58 PM

There should be about 20mm free play when on the wheels (not on the stand )

Title: Re: Chain problem
Post by: Trigger on October 11, 2015, 07:13:44 PM

Quote from: mike the bike on October 11, 2015, 03:38:56 PM

1 pair.   You can't have 1 extra link.

Are you sure  ;D ;D ;D

Title: Re: Chain problem
Post by: mike the bike on October 11, 2015, 08:41:32 PM

You know I'm right Trig.  Stop trying to confuse El Burro.

Title: Re: Chain problem
Post by: El__burro on October 11, 2015, 08:53:05 PM

thanks, i've read it before about the 20mm play.
unfortunately, the bike seems to have a problem, the engine struggles to go even at idle.
i've looked into the tank and it is full of bits (looks like rust) could it be carburettor?

thanks
el__burro

Title: Re: Chain problem
Post by: mike the bike on October 11, 2015, 08:58:49 PM

I had a 400four tank that had rusted inside the tank.  There was hardly any fuel coming out of the tap because the filter was blocked.   Worth checking.

Title: Re: Chain problem
Post by: hairygit on October 11, 2015, 09:00:03 PM

Could be, but before you go ripping the carbs apart, it may be the internal filter in the fuel tap. You need to drain the tank and flush it out first, then when it is clean, check the fuel tap filter. If running doesn't improve after that, then it's time to strip and clean out the carbs

Title: Re: Chain problem
Post by: mike the bike on October 11, 2015, 09:59:34 PM

That's the filter I was referring to.   When I pulled the fuel hose off the tap, not much fuel came out.

Title: Re: Chain problem
Post by: El__burro on October 13, 2015, 08:29:58 PM

Removed the fuel tap (and destroyed it) emptied the tank, fuel is very dirty with a lots of these dark balls (of rust i guess).
I have flushed the tank a few times but now I need to replace the part in the tap.
Any idea where to shop for it?

Regards
El__Burro

Title: Re: Chain problem
Post by: royhall on October 14, 2015, 07:05:23 AM

Don't know if your in a rush for it but here's one   
http://www.ebay.co.uk/itm/HONDA-PETCOCK-BOWL-GASKET-CB160-CB350F-CB500-CB550-CB750-CL160-16958-268-010-/360499898953?hash=item53ef77ea49 (http://www.ebay.co.uk/itm/HONDA-PETCOCK-BOWL-GASKET-CB160-CB350F-CB500-CB550-CB750-CL160-16958-268-010-/360499898953?hash=item53ef77ea49)   
Cheers Roy.

Title: Re: Chain problem
Post by: El__burro on October 14, 2015, 08:20:26 AM

Last time I bought something from the US i had a nasty surprise with custom charges. DSS sells it for about £10 (hopefully will be in stock soon). Until then I will be on the lookout.
Good day
El__burro

Title: Re: Chain problem
Post by: Chris400F on October 14, 2015, 08:58:14 AM

Custom charges should only apply if the value of the goods is above a certain figure (currently £15).

Title: Re: Chain problem
Post by: El__burro on October 14, 2015, 02:51:43 PM

That's something worth knowing.
After reading this i have gone and bought one.
Thanks
El__burro

Title: Re: Chain problem
Post by: El__burro on October 14, 2015, 02:55:29 PM

SH*T
I've just realised that I have bought a gasket for the bowl not the bowl i need.

Title: Re: Chain problem
Post by: Chris400F on October 14, 2015, 03:23:24 PM

How about this one?
http://www.ebay.co.uk/itm/Honda-CB77-CB350-CB550-CB750-Petcock-Fuel-Bowl-16952-268-000-/381036911877
At least you will already have a new gasket to fit it  :)
Or cheaper still, this one also comes up when you search eBay by the part number:
http://www.ebay.co.uk/itm/Honda-new-petcock-bowl-seal-CB77-CB-72-77-CB72-Super-Hawk-/301744398682?hash=item46415e215a

Title: Re: Chain problem
Post by: Chris400F on October 14, 2015, 04:06:23 PM

Quote from: El__burro on October 14, 2015, 02:55:29 PM

SH*T
I've just realised that I have bought a gasket for the bowl not the bowl i need.

Thinks .... If you're quick and contact the seller before the item is dispatched you might be able to cancel the purchase if you're lucky.

Title: Re: Chain problem
Post by: El__burro on October 14, 2015, 04:07:39 PM

I did, not sure i need to spend that much for it.

Title: Re: Chain problem
Post by: El__burro on October 16, 2015, 02:26:17 PM

(http://images.tapatalk-cdn.com/15/10/16/cc3b828f290d90c364cbe94fbcbf3879.jpg)
The US seller refunded the transaction, then I found this German seller on ebay.  £12.59 including p&p.
It should arrive next week.