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Messages - Ashdowner
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76
« on: April 14, 2017, 08:09:19 PM »
Where abouts are you MG?
77
« on: April 14, 2017, 06:55:05 PM »
I'm not that delicate. Just trying (and failing) to inject humour into yet another frustrating day.
78
« on: April 14, 2017, 05:45:59 PM »
Thanks for looking Julie and I can guarantee that unless you've put it in a vice and hit it with a sledgehammer it's not more knackered than mine. It's like Jaws (a la James Bond) decided to snack on it. They're bathed in oil all the time so they shouldn't really be knackered. (Is knackered a technical term? Never found it in any workshop manuals).
79
« on: April 14, 2017, 05:22:18 PM »
For goodness sake. I love my CB but it does cause me pain. Always wondered exactly why my 550K3 engine had been rebuilt and now I know why. The cam chain must have broken which makes sense of the damage to the head in one cylinder, but what I didn't realise and have only just noticed is that the thrashing chain had taken a big chunk out of the camshaft sprocket. It has worked fine up to now and may last forever more but I'd just be worrying about it if I put it back. Has anyone out there got a sprocket please? I think the sprocket was standard on all 550F and 550K bikes.
80
« on: April 12, 2017, 11:09:30 AM »
Final comment. I've had to use the old oil control rings (although I'm not sure they're that old) with the new Riken top and 2nd rings supplied by DS. IMHO there is absolutely no way that the new Riken rings would compress down to fit the bore.
81
« on: April 12, 2017, 11:06:47 AM »
With thanks to Gerben in Holland, I just want to share that Viton rings with an outside diameter of 9mm and an inside diameter of 5mm absolutely fit the bill. They're a smaller id than the originals but a bigger cross-section at 2mm, but they feel like they've really seated solidly when you put the tubes into the carbs and I've leak tested them today with 100% success. They're available from the major stockists.
82
« on: April 10, 2017, 09:55:05 PM »
I have no option but to discard the new oil-control rings I got from DS and use the old ones. The new ones will not fit - period. If my bores have got cross-hatching on them does that mean they've recently been honed?
83
« on: April 07, 2017, 09:51:12 PM »
The gap when the ring is in the bore is less than 1mm. Maybe 0.7. Anyhow everything is on it's way back from DS and they maintain the rings are right. I'm going to borrow some ring compressors and if they still won't go in then I'll put the old ones back in.
84
« on: April 05, 2017, 12:18:42 PM »
Julie where did you get your rings from?
85
« on: April 05, 2017, 12:06:15 PM »
Seabeowner - by compressing them by hand what sort of ring gap can you get down to?
86
« on: April 05, 2017, 09:29:44 AM »
Right. Are those new rings? What manufacture are they?
The rings I took out are 1.92mm across so we're in the same ball park whereas the rings DS have supplied are 2.24mm across which makes a difference of 0.6mm difference in the ring diameter which in this context is absolutely massive.
87
« on: April 04, 2017, 09:15:25 PM »
It's 3 parts. Spacer and top/bottom rings. Outside the bore, with the rings in the grooves and under pressure from the spacer, they jut out from the piston about 2mm. To compress them down to cylinder size involves also compressing the metal spacer and I've tried to do it by hand with the piston away from the bike, and ok I'm not superman, but it's impossible. (Tells me I won't be doing any arm wrestling with Nurse Julie if she can do it by hand). The real issue to me though is that the rings I've taken out are much thinner than the new ones and I'm struggling to believe they could have worn down 0.3mm. Hence I was asking if someone had some rings lying around that they could measure for me.
88
« on: April 04, 2017, 08:45:06 PM »
DS confirm that the oil control rings are correct but that they can only be inserted with ring compressors because of the force required to compress them. It strikes me that with the spacer compressed and pushing against the rings they must exert a mighty force on the bores. People have been telling me that they've been inserting CB550 rings by hand, but they must have fingers of steel to do it.
89
« on: April 01, 2017, 09:03:59 AM »
I have a mark on 1 of my pistons from the inlet valve having hit the piston, and the head of that cylinder shows past major trauma. I don't know what it was because someone rebuilt it and all is now well.
90
« on: April 01, 2017, 09:00:38 AM »
Now sent the new rings back, including one of my pistons with the new oil control rings fitted to demonstrate the problem,and the existing rings to show DS the difference in width. DS thinks that Riken have possibly packed the wrong rings
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