SOHC.co.uk Forums > CB500/550

Advice appreciated

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LesterPiglet:
I haven't had the bike running since I bought them..around ten years ago.  :-\

z1100r:
Agree with everything that has been said except "You have to have 2 cables". I agree with Lester on that one.
   On all my bikes that have 2 cables I have binned the 'close' cable. RD500's have them aswell.  I think the cable is predominantly for cold weather carb icing.

 I remember now how relieved i was  when I swapped my carbs way back in 82 to 550  to have a totally transformed throttle action. - from stiff and horible to light and nice. I even used a weedier spring than a stock 550.

 500-4 clutch and release mechanism is dreadful. As I think I said in my rebuild thread, The K3 was generally  a so much improved bike that its well worth fitting a K3 motor and carbs - if you are going to ride the bike alot. My original 500-4 motor and carbs are still sat on the floor untouched from 82. I knew I'd be riding the bike alot, so rideability was the priority not authenticity.

matthewmosse:
The 500 cluch slips, think mine had H/d springs and was slightly better but it was fitted with a sidecar so was always going to slip a bit. 550 cluch could slip as badly if thrashed. 550K3 carbs are more fussy about being stood but give better economy. You'd be well advised to change the airbox rubbers if junking the rest of the 500 bits as I had choke cable routing issues with the k3 carbs combined with 500 airbox. K3 carbs and airbox are consequently a bit harder to squeeze in as the k3 rubbers are 10mm or so longer.

Tomb:
I agree that they may have fitted the twin throttle cable for carb icing, however I can testify that it doesn't work, when I had my slides freeze there was no way you could move them either way, up or down, they were bloody solid

500/4 clutch mechanism? yep, shite ::)

z1100r:

--- Quote from: matthewmosse on March 21, 2012, 03:53:08 PM ---The 500 cluch slips, think mine had H/d springs and was slightly better but it was fitted with a sidecar so was always going to slip a bit. 550 cluch could slip as badly if thrashed. 550K3 carbs are more fussy about being stood but give better economy. You'd be well advised to change the airbox rubbers if junking the rest of the 500 bits as I had choke cable routing issues with the k3 carbs combined with 500 airbox. K3 carbs and airbox are consequently a bit harder to squeeze in as the k3 rubbers are 10mm or so longer.

--- End quote ---

Agree, in terms of slipping, the K3 clutch was only slightly better. Choke cable and airbox were fine on mine though. I did swap the engine top cover I think, cant remember which one I used  500 or 550. Breather Pipe comes out at an angle on one and straight on the other. Guessing I used the one to match the carbs cable bracket.

 I actually found K3 carb rubbers considerably easier to fit.  a) because they are longer and b) the gap between carb and airbox is larger. My airbox is stock 500.

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