SOHC.co.uk Forums > CB350/400

Air intake manifold

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kevski:
I never faff around with these things, any sign of hardening i buy new and bin the old ones, it makes life so much easier and gives me a little more beer time.

TKMSteve:
I had the same problem fitting mine onto the carbs. Problem as I saw it was the plastic body holding the trumpets pushed in and became concave when trying to push on the middle two trumpets, leaving them stranded.
I removed the four trumpets and because the body is plastic, I used a heat gun to warm up the face where the trumpets fit and from then inside, pushed the face outwards, focusing on the middle two trumpet holes.
When suitably convex shaped, I then dropped the plastic body into a bucket of cold water, to freeze this new shape.
Refitted the trumpets and then the complete assembly back onto the carbs which gave a better, longer fit on the middle two trumpets.

Athame57:

--- Quote from: Oggers on May 04, 2020, 04:08:12 PM ---Pretty certain it is some sort of plastic onto the carb. It does however mate into a rubber trumpet located within the - for want of better words - the large collector. This is definitely a different material than what mates onto the carbs. Mine is the earlier US version by the by.....

--- End quote ---
I think yours are like mine were before I bought new ones. Over time the heat from below, or perhaps just natural perishing transforms the texture. The new ones felt noticeably different. Last time I endured this ritual I fitted the rubbers to the airbox first and wrestled it all in that way, wasn't easy...but easier.  Maybe it's Tojo's revenge!

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