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CB500/550 / Re: Plugs fouling at idle
« Last post by K2-K6 on Today at 09:26:13 AM »
Quote from: davidcumbria on Today at 06:28:43 AM
Interesting thread. This fouling at idle - is this when the revs drop after running steadily for 20 seconds and can be cleared by revving the throttle to restablish the steady idle?  Mine does have that tendency on the denso plugs but also one cylinder which is cooler than the others so I’m guessing that’s the one that fouls.

I have found on many different bikes cars  lawnmowers-that iridium plugs give better starting, smoother idle  and avoid fouling on two strokes.  It seems there isn’t one available for the 550 - why not ?

Think I'd initially swap the plug lead with it's paired one to see if the cool running transfers with that lead. If it stays where it was, then looking more at that cylinder condition, compression analysis to count that out, idle jet system to ascertain if there's any impairment.
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Other Bikes / Re: BMW R80
« Last post by DomP on Today at 09:24:47 AM »
There's something about those engines I love,  they look so neat, who'd have guessed they were German.
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Other Bikes / Re: BMW R80
« Last post by Laverda Dave on Today at 09:16:45 AM »
Matt Hull the editor of Classic Bike Guide has spent the last year or two restoring a RS100. Every month there's an update and a how to type feature. He got it back on the road but after a few hundred miles he had the death knock and has had to strip it down again. Problem turned out to be a failed main/big end bearing, something he didn't attend to in the first rebuild as he was told these never give problems!
He's made some home made tools along the way such as puller's etc.
I know it's not the R80 but probably transferable information between the two. Well worth a read & subscription 👍.
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Other Bikes / Re: BMW R80
« Last post by Bryanj on Today at 08:34:40 AM »
The early K's had some problems but they were inline 3 or 4 cylinder bikes, i was taught by a good bm mechanic how to stop tappet rattle and will pass that on if you wish
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Other Bikes / Re: BMW R80
« Last post by Johnwebley on Today at 08:27:48 AM »
I have a thought, the joints and the  splines on the shaft drive,

I know a friend that had a K brick had issues

Sent from my SM-A546E using Tapatalk

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Other Bikes / Re: BMW R80
« Last post by K2-K6 on Today at 07:59:32 AM »
No experience on that bike from me either.

Does the gearbox have any problems now  ?

If not, then an oil change to look a what's in there (presuming it's seperate lubrication? ) and check through for specular particle etc would be worthwhile prior to the general restore.  Could be fine without strip and attention, with dedicated gearboxes unlikely to be compromised if lubrication has been OK through life.

If it's EP oil spec in there, my "favourite" oil is Motul EP 75w80 if that's in compatible range from specification.
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Other Bikes / Re: BMW R80
« Last post by Bryanj on Today at 07:47:18 AM »
Only ever had to do clutch and pushrod seals so cant really help there as they were always reliable
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Other Bikes / BMW R80
« Last post by davidcumbria on Today at 07:03:41 AM »
Wanted to try something different to restore after the 550k1 so have got a slightly unloved but running 1986 R80,  not the faired touring rt  one just the naked lighter bike. My daily rider is 1999 1100 GS and I’ve owned several 1200 GS so I could see the lighter lower R80 as a bike I could enjoy long term. The 800 has a reputation as the smoothest airhead and it does have that feel.  Restoration will be next winter but my initial research makes me think self restoration of the gearbox is probably out due to special tools, intricate shimming and a press needed which is slightly disappointing and makes me reflect wistfully on the ease of doing the 550. Anyone here with any experience or thought on a BMW airhead ?
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Project Board / Re: Doms CB550F1 project
« Last post by DomP on Today at 06:51:45 AM »
Thanks David, it's been a bit of an evolving project really, it was meant to be a budget build!😄

It would be good if you could find the details Roo, ive just looked on Louis moto and there are a few different cables so I may give them a call to see which I need, they all appear identical.  One other question, have you blanked off the tacho drive on the cam cover?  I was looking at that very gauge too but now I'm thinking of a smaller 64mm koso
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Project Board / Re: Doms CB550F1 project
« Last post by davidcumbria on Today at 06:40:19 AM »
Good progress Dom I like the way your design really gives more emphasis to the engine/ exhaust than the stock bike. Shame about the Daytona ( I have a street triple ) but unless you never ride your bikes or do anything in the garage these minor damage issues seem to be an annoying fact of life for most of us.
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