SOHC.co.uk Forums > CB350/400
Carbs off bike - Total disassembly or not?
Laverda Dave:
That piece of tubing is correct. When you take the carbs apart you will find 1&2 and 3&4 are linked by a black plastic tube running between them. The tube has two o-rings on each end (so four in total on each tube). These push into to the carb bodies. Be very, very careful when pulling the carbs apart as these tubes are brittle and will snap if you try to twist the carbs apart. Try to pull them apart to prevent snapping the tube as they are hard to get hold of as they are not a spare part.
I think Nurse Julie sells the o-rings for these tubes in viton but check with her first. Do not be tempted to reuse the old o-rings as they will leak and it will be another strip down to replace them.
Another tip is to bench test the carb assembly for fuel leaks before you refit them to the cylinder head to ensure the float levels are correct.
Mikep328:
THANKS!!!
Also...in this pic showing the bowls. Is the orientation of the drain fittings correct? It seems to me they should be reversed. In this view, carb one is on the right. Shouldn't one/two drains be pointing to the right in this pic and 2 and 3 pointing to the left?
I pulled one float bowl - silicone, Oring, and some sort of red-orange sealant that is quite hard and difficult to scrape out of the groove. :(
Laverda Dave:
Yep, they appear to be fitted back to front. The large brass drain screw should be fitted to face outwards to enable a flat blade screwdriver to be used to open them. The bowls themselves only fit one way round so effectively no 4 bowl should actually be number 1 bowl.
For information, you will see the carb bodies are numbered on the flange. You will see the numbers 1, 2, 3, 4 cast on the flange with a feint circle cast around one on the numbers. This will tell you what carb number it is. They are hard to see when all the carbs are together but once apart are easy to see.
Athame57:
--- Quote from: Laverda Dave on August 07, 2023, 11:51:20 AM ---I think Nurse Julie sells the o-rings for these tubes in viton but check with her first. Do not be tempted to reuse the old o-rings as they will leak and it will be another strip down to replace them.
--- End quote ---
Yes, she does, I just bought a set the other day. Thanks for the warning about the brittle tubes though. I'm soon to start renovating my own. I think I'll buy some Frost Ali Clean again for the bodies, it works wonders on unpolished ally. I'm not sure if that includes the wheel hubs, can anyone enlighten me?
Athame57:
--- Quote from: Mikep328 on August 07, 2023, 11:54:27 AM ---I pulled one float bowl - silicone, Oring, and some sort of red-orange sealant that is quite hard and difficult to scrape out of the groove. :(
--- End quote ---
Someone has been too liberal with the Red Rubber Grease that one should put on rubber o-rings. https://www.redrubbergrease.com/
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