SOHC.co.uk Forums > CB350/400

Carb inlet manifold rubbers

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Nurse Julie:
If all 4 are the same, they can't fit properly, as 2 are angled differently than the other 2. I can't see how they will be a good fit if not angled correctly. We are talking about manifold to carb rubbers aren't we, not carb to airbox rubbers which are all the same?

sprinta:

--- Quote from: Erwin83 on December 04, 2019, 01:34:20 PM ---On this topic: i recently got a set of (non-OE) replacements for my 400f. These are all 4 the same. They're <35 GPB for a set of 4, so the price is attractive enough.,,

I already pointed out to the (english) ebay seller, that the fitment is not ideal. He responded that he's sold over 200 sets, and they work fine.
My conclusion is: yes they work, but they don't work very well. It takes a lot of force to install the carbs all the way, even though the rubber is nice and soft.

Anyone have experience with this?

--- End quote ---

Try a little silicon grease on the outer lip faces of the carbs and a little on the inner faces of the rubber tubes, I find that helps.

Erwin83:

--- Quote from: Nurse Julie on December 04, 2019, 01:38:45 PM ---If all 4 are the same, they can't fit properly, as 2 are angled differently than the other 2. I can't see how they will be a good fit if not angled correctly. We are talking about manifold to carb rubbers aren't we, not carb to airbox rubbers which are all the same?

--- End quote ---

We're talking about the manifolds indeed, between head and carb.
The offset of the middle two is limited (just 2-3 mm out of center or so), so this set is supposed to be just pushed/forced in the "angle".
With force, they do fit. And at 35 GBP for all 4 boots, I still think it's a good deal.
I'm just wondering if anyone else has this experience.



--- Quote from: sprinta on December 04, 2019, 01:43:19 PM ---
--- Quote from: Erwin83 on December 04, 2019, 01:34:20 PM ---On this topic: i recently got a set of (non-OE) replacements for my 400f. These are all 4 the same. They're <35 GPB for a set of 4, so the price is attractive enough.,,

I already pointed out to the (english) ebay seller, that the fitment is not ideal. He responded that he's sold over 200 sets, and they work fine.
My conclusion is: yes they work, but they don't work very well. It takes a lot of force to install the carbs all the way, even though the rubber is nice and soft.

Anyone have experience with this?

--- End quote ---

Try a little silicon grease on the outer lip faces of the carbs and a little on the inner faces of the rubber tubes, I find that helps.

--- End quote ---

I used WD40, similar?

Problem was that before tightening the clamps, the carbs were pushed out again. Due to the angle.

Nurse Julie:

--- Quote from: Erwin83 on December 04, 2019, 02:04:15 PM ---
--- Quote from: Nurse Julie on December 04, 2019, 01:38:45 PM ---If all 4 are the same, they can't fit properly, as 2 are angled differently than the other 2. I can't see how they will be a good fit if not angled correctly. We are talking about manifold to carb rubbers aren't we, not carb to airbox rubbers which are all the same?

--- End quote ---

We're talking about the manifolds indeed, between head and carb.
The offset of the middle two is limited (just 2-3 mm out of center or so), so this set is supposed to be just pushed/forced in the "angle".
With force, they do fit. And at 35 GBP for all 4 boots, I still think it's a good deal.
I'm just wondering if anyone else has this experience.



--- Quote from: sprinta on December 04, 2019, 01:43:19 PM ---
--- Quote from: Erwin83 on December 04, 2019, 01:34:20 PM ---On this topic: i recently got a set of (non-OE) replacements for my 400f. These are all 4 the same. They're <35 GPB for a set of 4, so the price is attractive enough.,,

I already pointed out to the (english) ebay seller, that the fitment is not ideal. He responded that he's sold over 200 sets, and they work fine.
My conclusion is: yes they work, but they don't work very well. It takes a lot of force to install the carbs all the way, even though the rubber is nice and soft.

Anyone have experience with this?

--- End quote ---

Try a little silicon grease on the outer lip faces of the carbs and a little on the inner faces of the rubber tubes, I find that helps.

--- End quote ---

I used WD40, similar?

Problem was that before tightening the clamps, the carbs were pushed out again. Due to the angle.

--- End quote ---
Mr Honda didn't give them 2 different angles for no reason. When I put my manifold rubbers on after the engine rebuild, I got those 4 rubbers on incorrectly, as at the time I did not understand the significance of the numbers on them. Fitted incorrectly, they definitely pushed the bank of carbs out of alignment. I didn't have any air leaks but, you could definitely see opposing forces were at work. As soon as I took the manifold rubbers off and got them in the correct order, everything fitted like a glove and was perfect. I use a smear of red rubber grease on all the carb boots / manifold boots etc when fitting, never WD40.

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