Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: dean550 on February 08, 2011, 06:40:30 PM
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Hi can anyone tell me, where the breather tube from the breather cover goes to? and where the two outlets on the bottom of the air filter box and the outlet on the air manifold?
thanks
dean
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which model 550?
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Looks like an F2 from the photo in the avatar Bryan.
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hi, im not 100% sure, would the frame number CB 550F 1018405, engine number CB550E 1129395 be of any help.
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Sorry my eyes aint good enough to decifer the avatar pics!! but with the "F" in the frame number i would think Steve is right, Only a letter from Honda would be 100% and that costs
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thank you very much i will try and put some pictures up at the weekend, what areas of the bike inparticular.
thanks dean
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Tank (side and top) exhaust if its original, carb tops.
Those should ID it
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hi Bryan hope these pics are what you are looking for to help ID my 550.
(http://i161.photobucket.com/albums/t218/alimali1991/honda%20cb550/DSC_0027.jpg)
(http://i161.photobucket.com/albums/t218/alimali1991/honda%20cb550/DSC_0046.jpg)
(http://i161.photobucket.com/albums/t218/alimali1991/honda%20cb550/DSC_0045.jpg)
(http://i161.photobucket.com/albums/t218/alimali1991/honda%20cb550/DSC_0044.jpg)
(http://i161.photobucket.com/albums/t218/alimali1991/honda%20cb550/DSC_0042.jpg)
(http://i161.photobucket.com/albums/t218/alimali1991/honda%20cb550/DSC_0040.jpg)
(http://i161.photobucket.com/albums/t218/alimali1991/honda%20cb550/DSC_0038.jpg)
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Bastard. Carbs are the later PD type that were on K3.
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F2 with K3 carbs.
Honda headers. Dunstall silencer?
Front mudguard looks sorts Suzuki-ish...
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why bstard, are the later k3 PD type better?
thanks for the info, but back to the original question of, where do the pipes run please?
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I concur that the carbs are wrong for the bike, which means that the air box and rubbers are not original so its very difficult to be sure of where anything goes!
The pipe from the top of the engine ought to go to a connector under the air filter box to re-circ the oil vapour.
The pipe on the plenum chamber (where the rubbers fit) does not go anywhere BUT it isnt an ordinary pipe either, from memory it lets fuel overflow out but isnt supposed to let dirty air in
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The K3 carbs ran much leaner (55mpg vs 40mpg for the other 500/550s I owned). Downside was that it would overheat very quickly in the summer if run at a standstill (like in the queue at Silverstone for example... :-[)
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thanks SteveD and Bryanj the pipe info makes perfect sense now. So the answer is not to sit still for to long in the next swelter of a summer that we are bound to get. Ha Ha
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I can verify the overheating thing on the 550k3 carbs, have them on my 500/4 sidecar outfit for the economy but the trade off is the cold starts / stale fuel means the maintenence is higher. I think the 500 got better than 40mpg with standard carbs but re jetted (presumably) for a k&N filter and aftermarket pipes.
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You're right Matthew. My 500/4s all do more like 50mpg 8)
The one in my avatar did indeed have K&Ns, big jets and a Piper exhaust but in those days we didn't give a stuff about mpg!
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Hi can anyone tell me, where the breather tube from the breather cover goes to? and where the two outlets on the bottom of the air filter box and the outlet on the air manifold?
To start with the latter, originally it had a tube as a drain. You could pinch it open for that.
The breathertube on later 550 models (and 500K3) were connected to the bottom of the air filter box. The idea was to recycle blow-by fumes through the foamfilter located under the paper filter element into the engine. I've seen quite some paper air filter elements that got fouled because of this. You can reconnect it but then you have to monitor things regularly. Or you could reroute the breather tube like on the older models (best seen on p 170 of the original Honda Workshop Manual CB500 - CB550) where it vents in the open.
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thanks for the info
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Mine has big jets, k&n filters and laser exhaust and still does about 50mpg, although that does go down with hard riding. Of course these things make it a very authentic seventies bike.
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Definitely K3 carbs on a CB550F bike. The remote choke cable up on the handlebars gives that away. The front mudguard looks like it may have the holes where the front stay used to be. Nice to see a chrome rear mudguard though...they normally rust away really quickly. On my second CB550F1 I fitted a K&N filter which did away with the airbox & I rerouted the large hose from the top of the engine to under the bike towards the left side so that any oil vapour would be directed onto the chain. The fuel tank overflow pipe was routed in a similar direction. I did the same K&N fitting onto my wife's CB550F2 & onto my commuter CB550K3. The fuel consumption on my K3 was excellent...I was getting 65mpg on a regular basis riding to Croydon from Bexleyheath everyday (at the time) so the extra power was very useful when the opportunity arose. My friend who bought the bike from me still has it & will not sell it as he enjoys riding the K3 when he does not want to ride his '04 R1.
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thanks for that Yoshi823,florence. I had planned to keep it as original as poss but i think previous owners have put paid to that idea. However i suppose they are sympathetic worthwhile mods that hopefully work well?