Honda Twins banner

1 - 4 of 4 Posts

76 Posts
Discussion Starter #1
Hi folks

As I told you in my CB200's log, I bought wrong intake manifolds few weeks ago... Everything was set to start the engine and the manifolds spoiled my happiness... Back to search for the right ones.

Once is very difficult to find the original rubber manifolds here in Brazil, I'm here to ask to the masters: Can I use the aluminum manifolds in the pictures below? In both of them is written 306B, wich I assume that's the part number, right? Simo advert me about the need of insulators on aluminum manifolds. Do you know where I can find them to buy? (or how can I build them?)

Thanks a lot, folks.

11256213_827463787347676_649079421_o.jpg 11221028_827464020680986_1764804030_o.jpg 11254773_827464237347631_1605728214_o.jpg

27,021 Posts
First, let me state that I have not actually swapped out the aluminum CB/CL 175 manifolds onto a CB/CL 200 engine.....
So, all that I will now tell you is based on my experiences swapping carbs , insulating blocks, and manifolds on other Honda models, but the principles are the same....

Basically, the insulator block is just a non heat conductive plastic spacer, with a paper gaskets to assure sealing..Essentially a very thick gasket...
The critical measurements are the size and placement of the larger center (bore) hole relative to the mount bolt holes.....
Some blocks have all three holes on a single centerline, some have the bore hole somewhat offset from the mount hole centerline......
Some actually have a taper or slant built into them, but I believe the ones you will need are just flat.....
Many similar insulators are used on the "Chinese-Clone" and scooter engines and can be obtained in a variety of bore sizes...
Other Honda models have some that can be easily (and only slightly) modified to work.....(You'll likely have to "oval" or "slot" the mount holes)

insulators 002.JPG
  • Like
Reactions: Tuxo
1 - 4 of 4 Posts