Post by: Richie 550/4 on September 01, 2019, 06:41:42 PM
New member here, looking for help/advise.
My cam chain has busted on my new toy😩
I am having trouble finding a new top cam sprocket. Anyone out ther got any suggestions?
I've tried David Silver, CMS, Wemoto and have generally searched the internet, but. To no end.
Any suggestions would be greatly appreciated.
Many thanks
Richar
Post by: Nurse Julie on September 01, 2019, 07:00:03 PM
Post by: Bryanj on September 01, 2019, 07:29:01 PM
How many bent valves/ broken valve guides are there in the head?
Post by: Richie 550/4 on September 02, 2019, 08:13:21 AM
Thanks for the response to my cry for help!
I am having trouble with posting a reply. So if 3 appear I do apologies.
It seems so far that the chain broke on a link and has done no extra damage other than taking the guide out with it. The top sprocket is damaged on the teeth edges and I have not got to the bottom one yet. Next job is to split the crankcase and have a good look around at what may need doing whilst in there retrieving parts.
Thanks for the offers Oddjob and Brynanj if either of you do dig a top sprocket out of your stored, I would be very happy to part with beer tokens for your efforts. Let me know if you have any joy on that front.
Richard
Post by: Greg65 on September 02, 2019, 08:37:36 AM
Fingers crossed for you,
Greg
Post by: Bryanj on September 02, 2019, 09:35:39 AM
The bottom sprocket is cast as part of the crankshaft and not replcable seperately.
Post by: Greg65 on September 02, 2019, 10:25:42 AM
Cheers,
Greg
Post by: Richie 550/4 on September 04, 2019, 08:28:43 AM
Update:
Bryanj. You were absolutely right, I do indeed have a couple of bent valves.
Greg. Yes I did read the rebuild post by Nurse Julie. Very interesting.
It seems I may have other issues too. A friend has had a look over the parts and there are other areas of concern. It would appear the fellow that did the top end rebuild on this machine recently before I purchased the bike had cut a few corners on the rebuild.
General opinion is that I have bought and subsequently opened a big can of worms.
I bought this bike to go out and enjoy with my son who is 21 and rides his..... Cow O Saki ?? I think they are made by Bovine Japanese Alchoholics or something like that. But upon finding these issues it is looking like I will be putting the bike to bed for winter.
Since I've had it I've already rebuilt and cleaned out the carbs and tank as they were both full of debris. And now I'm into a full engine rebuild!! So much for getting out with the boy!
i will keep any interested parties up to date as and when things progres. Got to take the cylinder block, head and rocker cover in to have it all measured to see if we still have something worth working and spending more money on!
Hope I haven't bought a pretty lemon!!!!
Richard
Post by: Bryanj on September 04, 2019, 08:37:01 AM
Post by: Richie 550/4 on September 04, 2019, 09:19:37 AM
The main problem it seems I may have is that the cam seats may be worn and it is suspect that some of the rocker arm spindle seats may also be worn. Couple that together with what we may find in the bottom end and it's looking as though it could be an extremely expensive rebuild.
It would be good to know if any of the later model lumps would fit straight into my 1976 frame?
I am maybe looking down the route of a later doner bike that I can rob the engine and rebuild before fitting back into my new/useless toy.
Any info on this as an option would be greatly appreciated.
Richard
Post by: Laverda Dave on September 04, 2019, 11:46:09 AM
To be realistic, there are probably a couple of months decent weather left to go riding, it will take you that long to find a donor bike/engine and slot it into your frame. You would be better off stripping your engine down before the weather gets bad, seeing what you need (the cost will go on rising!) and start gathering the bits together for a rebuild. As Bryan has said the bits are out there to rebuild these engines and what else are you going to do over the winter whilst the O/H is watching Strictly on the TV? You could spend it in a cold garage getting to know the innards of your motor and come spring it will be rebuilt and you'll be proud of what you have achieved :).
The best thing about this forum is the number of experts on here, advice is free and willingly given, all we ask for is plenty of photos (we like photos over the winter months to keep us all going ;)) and the occassional donation to keep this great forum alive and kicking.
Good luck with whatever you decide to do.
Post by: paul G on September 04, 2019, 12:20:37 PM
I think before I invest in another engine of unknown condition I would strip down your existing engine first to determine the condition of it and to determine what is salvageable and go from there. If you buy another engine it will be at least 30+ years old, countless owners, probably no history and you could slot it into your frame and get the same results.
To be realistic, there are probably a couple of months decent weather left to go riding, it will take you that long to find a donor bike/engine and slot it into your frame. You would be better off stripping your engine down before the weather gets bad, seeing what you need (the cost will go on rising!) and start gathering the bits together for a rebuild. As Bryan has said the bits are out there to rebuild these engines and what else are you going to do over the winter whilst the O/H is watching Strictly on the TV? You could spend it in a cold garage getting to know the innards of your motor and come spring it will be rebuilt and you'll be proud of what you have achieved :).
The best thing about this forum is the number of experts on here, advice is free and willingly given, all we ask for is plenty of photos (we like photos over the winter months to keep us all going ;)) and the occassional donation to keep this great forum alive and kicking.
Good luck with whatever you decide to do.
+1 on the above. Go for it :D
Post by: Bryanj on September 04, 2019, 08:37:00 PM
Post by: Colonial-Clive (yindi) on September 04, 2019, 09:26:52 PM
Post by: matthewmosse on September 04, 2019, 10:03:17 PM
Post by: Richie 550/4 on September 08, 2019, 09:38:56 AM
Thanks for all the suggestions.
I have been stripping down and cleaning up parts over this weekend, getting the Rocker cover, head and block ready to go to a local engineering firm for the once over and to get an estimate on the work required.
I still have yet to crack the crankcase open and see what awaits me inside. I am pretty sure the bottom cam chain sprocket will be in a similar state to the top one, so in order to get ahead of the game: does anyone out there know of any good condition Crankshafts available for a 1976 550f1, I have found a new one but the price is very scary!!!!!
I have been trying to add some photo's for those who are interested, but so far I cannot get the post to send with pics? any suggestions? I live on a boat and only have interweb via a mobile phone hotspot. Maybe this could be the problem?
Bryanj. Still interested in that cam sprocket, as and when you may find it.
Richard
Post by: Laverda Dave on September 08, 2019, 10:04:25 AM
There maybe a better way to reduce its size but that's always works for me.
Make sure when you post the photo to yourself you are in a wifi spot otherwise you may get charged.
Post by: Richie 550/4 on September 08, 2019, 01:34:00 PM
That all sounds a bit long winded for this technophobe! Not even sure I have messenger.
Thanks for the suggestion though. I checked the file sizes and they were well within the plaited KB stated on the site?
I'll give it a go and see what happens!
Richard
Post by: Richie 550/4 on September 08, 2019, 01:36:22 PM
Don't know how Spell Check changed Allotted to Plaited!
Post by: SteveD CB500K0 on September 08, 2019, 01:52:19 PM
)This stops the most blatant spammers.
Steve
Sent from my iPhone using Tapatalk
Post by: Richie 550/4 on September 08, 2019, 03:01:45 PM
Thanks for that info Steve. Sensible!
You may all regret me passing the initiation proc as though!
Richard
Post by: Richie 550/4 on September 20, 2019, 05:57:37 PM
I am pleased to report that the top end has returned from the engineering firm with a full bill of health. They have honed the bores, skimmed the head, seated the valves and checked the valve guides.
Now I cannot put of the inevitable bottom end rebuild! The part of this saga that worries me the most. Gonna need to free up a little time for this part. Don't want to go away and come back to it with no idea where all those bits go and in what order. Here's hoping the bottom cam sprocket is ok🤞
Will post some pics over the weekend. It all looks shiny and new😁
Richard