SOHC.co.uk Forums > CB350/400
Carb-to-head manifold "insulator" removal - SUCCESS!
Winterfield:
I take it the engine is still in the frame? I couldn't get my impact driver (like the one pictured above) to get them out, there was no space to swing a hammer.
What I ended up doing was to repeatedly use penetrating oil on the screws over a period of days. Then I used the bit from my impact driver, which was quite a large diameter, along with an 8mm socket in a wrench. The bit went into the socket, and I used the leverage from the wrench while pushing hard down on the wrench head to stop the bit from jumping out of the screw. Much to my surprise, the screws came out without damage.
I think the trick is to find the perfect fitting driver, more likely than not, JIS as mentioned above.
Bryanj:
Always tap the bit into the screw head before trying to turn, it jars the thread
mattsz:
Thanks, everyone! Penetrating oil over two days hasn't seemed to help - I assumed that the rubber was sealing it out.
I do have a couple of bits that, while they aren't indicated as JIS per se, they do fit snugly into the Honda screws without any play. I've used one in particular to loosen a few screws that were already damaged by ill-fitting tools. I have a t-bar that could work - maybe I'll use it to apply the rotational force and get my wife to tap it with a hammer - she's been looking for ways to participate in my motorcycle hobby...
mattsz:
Thanks again, gang! I got them all - using the T-bar and tight-fitting bit. Really just a heavier-duty (much!) version of the tool from my first post.
I was able to drive the bit into each screw and have it stick tightly, after which careful use of the T-bar broke them all free with a loud snap. I worried each time that I had broken something, but no. Two of the heads have been mangled already though (even so, the hammered bit worked), so I'm going to replace them. Might use some allen socket screws...
Athame57:
I quickly gave up trying to take mine out as I started damaging the screwhead. I've opted to wait until I finally get my leaky head gasket changed and have it done then.
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