SOHC.co.uk Forums > Project Board
CB500K1. Cafe Racer to Original...sort of!
MarkCR750:
It's relatively common for the brass overflow (snorkel) tube to fracture along its length, hairline crack, hard to spot, if it still leaks the chances are that's what it'll be, if you get some black oily dirt on your finger, then rub it around the the tube, then wipe it off again, the dirt thats gotten into the crack will show where it is, if you can't readily get a replacement bowl you can repair the pipe with electrical solder I believe, I was lucky because a forum member kindly gave me a spare bowl when it happened on my CB750.
petermigreen:
Yes, VERY hard to spot, especially with 'old' eyes. As Mark suggests, I fixed the same problem by running a little electrical solder in the split. Fixed it a treat.
Good luck with your fault finding, Carb problems are my most hated thing on motorcycles.
Peter
AndyH:
See my other thread for the latest.
hairygit:
Also check the condition of the fuel pipes/lines, as modern fuel can attack certain rubber items and be breaking up internally even if they look okay from the outside and don't leak.
Sent from my X6pro using Tapatalk
MarkCR750:
Another possibility is that the number 2 float is too heavy and isn't floating correctly, I had this on one of my carbs, the float had become porous and was weighed down with fuel, just enough that sometimes it wouldn't push hard enough against the float needle for it to maintain its seal, I noticed when I had the bank of carbs inverted on the bench with the bowls off to check the float heights, one was sitting a couple of mm lower than the other 3, I moved it to the next carb and it sat lower on that one, then I saw a minute pin prick of fuel weeping out of the float, I replaced it with a good second hand one and the issue was fixed.
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