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Topics - Hudson.
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« on: May 29, 2017, 01:08:38 PM »
Hi guys, A while back I made a post about the issue i was having selecting first gear, seen here http://www.sohc.co.uk/index.php/topic,9195.msg63727.html#msg63727I've only just gotten round to taking a look at the bike (bad I know), anyway I removed the clutch cover and found a chunk of alloy laying in the bottom, removed the clutch assembly and upon closer inspection have found part of the lower casing has 'chipped' off around the gear shaft plug at the end. I made a post on a CB550 facebook page and one guy in particular had also had this issue with gear selection and described the exact same culprit being a cracked part of the casing in the same place. The bit thats missing was retaining the shaft meaning there was no endfloat, however now the casing has cracked it means the shaft can move in sideways axis approx 3mm and this causes gear selection issues. Stole this picture from the internet to show you guys the bit i mean, this is what i should look like:  And this is mine!:  Has anyone else ever had this issue? If so how did you go about fixing it? The guy on facebook didnt have any reference pics but said he'd tapped the casing with M6 threads, made a plate/bracket up and put shims behind the retain the shaft. Before i have a go at it, i was wondering if anyone on here had seen it before and knew of any alternative solutions? Thanks in advance! Rich
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« on: November 19, 2015, 05:31:08 PM »
Hi, Having issues with my 550 not engaging first gear properly and making some pretty interesting noises. Brief history of recent events: - Was riding fine, clutch cable hopped out of bracket by clutch housing due to loose locknut - Re-fitted cable and adjusted to suit - Rode fine for about a day, then sometimes wouldnt take off in first gear (gear engaged, clutch out, revving free, then sometimes would bite and take off). Other gears fine - Decided clutch plates possibly sticking, fitted new clutch pack and cleaned up slightly corroded steel plates - Fresh oil with new clutch install - Rode fine for around 20 miles, then same issue started again - Started making strange rattling noise when engaging first, sometimes wont engage at all, sometimes does, but then rattles again with clutch released. All other gears are fine and clutch doesnt slip throughout any gear at any revs. Been pulling away in 2nd to get it home. I took this video to show you, rattles into first gear, start releasing clutch, rattle comes back: https://youtu.be/y3jD9-GKxuIIt appears the rattling noise and vibrations are coming from the gear selector spindle or something related. Quite certain its not the clutch. Could it be the gear itself, or the selector mechanism?? Any pointers appreciated, its my first time owning a bike like this and ive not taken the engine apart yet! Thanks
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« on: September 18, 2015, 08:38:05 PM »
I recently got my 78' 550 road worthy. Recent work includes a total carb rebuild (floats are all set, everything clean and clear), pod filters (I know!), larger main jets, valve clearences, cam chain tension, vacuum sync.
Bike easily starts without choke (too rich?), but idles very nicely at 1000rpm. Theres some slight spluttering at part throttle which im sure is down to fine tuning of the jets and needle positions.
However, after a 30min ride last night, most of which it was running great, i opened the bike up in 3rd gear when joining the motorway, revs up to approx 8k and the bike spluttered. I backed off the throttle and the bike misfired 8 miles home on what seemed like 2 cylinders. Id been at WOT a few times before hand with no issues and it pulled great.
Sure enough when i got home I took out the plugs to find plugs in 2 and 3 a lot more coked up than 1 and 4, although not wet, just black in comparison to the biscuit colour of 1 and 4.
Im still learning all this, but am I right in thinking this is an ignition issue? Where should I start looking?
Dont have much time to work on the bike at the moment and really need it for next weekend, im tempted to buy new coilpack and points but itd be nice to diagnose the issue instead of just throwing money at it?
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« on: August 20, 2015, 06:57:02 PM »
Hi all, As title, do earlier model tanks (ones without flush fuel caps) fit late model 550's? Im after a replacement tank as is stripped mine down to find a patch of filler hiding a big dent, its also rusted through and leaking.   
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« on: August 16, 2015, 11:44:48 AM »
Changed a cracked sump on my recently purchased 78' CB550K, so drained the oil and didnt see anything worrying in there. Replaced sump, decided to change the oil filter for good measure.
Removed the oil filer housing from the front of the engine to find the remaining oil thats in there has a fair amount of fine gold (i guess brass), flakes in it.
What could this be from? Im pretty concerned now as i just want to use the bike but have a feeling i'll need to tear the engine down now..
The bike has 54k miles on it, unsure if the engines ever been rebuilt. History from previous owner includes a new primary chain and replacement top end..
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« on: August 12, 2015, 01:25:32 PM »
Been posting here a lot recently, not off to a good start with this bike  I have a 78 CB550K, it was riding fine but leaking oil from the clutch cover so I removed the cover to replace the gasket. Being new to the bike and still learning i undid the locknut and played with the adjuster screw on the clutch cover before i removed the cover itself, thinking it was attached to the bike some how. Anyway, replaced the gasket and put the cover back on, adjusted the screw as-per what ive read online on how to adjust them. People keep saying to turn the screw CLOCKWISE to move the pivot/closer to the pin in the centre on the clutch. However on mine at least, you screw the adjuster C-CLOCKWISE (left), to wind the lower part of the pivot towards the clutch and engagement with the pin in the centre of the clutch (sound about right?) Anyway, with the cable disconnected, i adjusted the screw c-clockwise until it went solid (pivot hard up against the centre pin i think?), then backed it off a touch. The notches on the outside of the case roughly line up. With the cable connected, the clutch lever is so hard to pull now, and when you pull it in something gives underneath the clutch cover and the arm goes completely slack. Turns out the lobe which lifts the top end of the pivot is jumping out from behind:   Why is this happening?! The only reason i can think is the clutch is somehow siezed now? Meaning theres no give in the clutch so the pivot doesnt move and the lobe hops out from behind it? I'm not sure This is so frustrating, all i did was change the gasket, and tweak the adjuster screw and now this. I dont think/i cant see how im adjusting it incorrectly? The screw on the bottom on the clutch cover literally moves the pivot closer to the pin to disengage the clutch ? To top it off, just trying to get it working, i pulled the lever and heard a nasty noise...  .......so if anyone has a spare clutch cover they are willing to part with, that'd be ideal. Its this type:  Please help, before i lose any interest in this thing.
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« on: August 09, 2015, 03:09:01 PM »
I've been rebuilding the carbs on my 78' 550. I was winding the spring round the choke linkages (which connect the two choke spindles), and managed to snap it, i cut it back a bit and bent the end back round, but just couldnt get the linkage to work properly, to the point where i got frustrated and managed to bugger the spring totally... Its the spring on the right hand side in this picture for reference:  I've put a wanted thread up for another spring, as i havnt been able to find one to buy seperately online from the likes of david silver etc. I wanted to ask if anyone knows where i could get one? Or will it be a case of finding someone willing to part with a spare spring? Has anyone been stuck in this situation before and managed to fine a way round not using a spring at all? I was tempred to get a friend to weld the two shafts together...
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« on: August 08, 2015, 10:18:32 AM »
Hi guys, Dissasembling the PD46A carbs off my 550K3 and this plastic shim fell out from somewhere. Im not sure how it was fitted or where it came from exactly, can someone help?  Thanks in advance, apologies for the silly question!
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« on: July 30, 2015, 08:37:41 PM »
Hi guys, The sump on my 78' 550 has been cracked, the previous owner has used the engineering procedure known as 'chemical metal' to repair it. But its slightly weeping oil. Question - are the sump pan's the same throught the CB550 years or will i need to find a 78' specific sump to replace it with? Question 2 - does anyone have a sump to sell me?  Thanks in advance Rich
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« on: July 26, 2015, 12:01:04 AM »
Hi, Last weekend I bought this 1978 CB550 from a guy in Essex, listed as spares or repairs with a few relatively small issues to fix up. Im not really sure if its original with all the right parts etc, but im planning to take this bike apart over winter and changing a fair amount. It'll end up pretty lean and simple cafe/brat style and mostly black i think. - The kick start mechanism doesnt work as the splines has been stripped off, i guess the pedal was loose at some point and the splines got mashed up. Electric start works good though and the bike starts strong. - Leak from the clutch cover - Starts well but doesnt run great, the idle is a bit lumpy. Takes quite a lot of throttle to be able to pull away with out bogging and stalling. Its better at WOT but still not completely smooth. A lot of backfiring on over run. Plans first off are the take the carbs off and inspect. Thoroughly clean them out and set floats, synchronise and go from there. The previous owner never actually rode it and potentially made a few changes. It has a pretty free-flowing exhaust fitted with a bolt on tip, so maybe the carbs havnt been re-jetted to suit the exhaust. I plan to run pod filters eventually but want to get it running spot on as-is first and learn the bike before making too many alterations. I'll make all the engine changes before i strip the bike down this winter so i know I can put it all back together and not have any issues, hopefully!        Hudson.
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« on: July 25, 2015, 10:13:54 PM »
Hi guys,
Just bought myself a 78' 550K with a few issues.
On of which is the kick start spindle. I think someone has previously kicked the bike over with a loose kickstart pedal and rounded off the splines... and tried a number of repairs in attempt to get the kick start pedal to bite the shaft.
How easy/is it possible to replace the shaft? I havnt had a chance to look yet and im not with the bike at the moment.
Just thought id ask!
Thanks
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