SOHC.co.uk Forums > CB350/400

Re-threading carbs?!

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Alexrayz:
Hey everyone!
I'm in the preparation and research phase for my carb rebuild for my 400/4.

These carbs have given me all sorts of headaches since I got this bike but truthfully it was my lack of knowledge that was the main culprit.
In a previous attempt at revuilding them I changed all the jets and tubes etc... On one of the carbs the idle jet thread got brittle and some bits fell into the conduct. It also meant that I couldnt get the jet to sit properly. The threading got so loose in fact, I didnt feel any resistance when screwing in the jet and I crushed a few jets thst way.
I ended up taking the damn thing to a mechanic near Paris specialized in 400/4. She managed to patch it up, saying that it was just a fix not an actual repair and I should be weary with the idea of rejetting that carb.

Fast forward today where I indeed want to rejet with originals that are graciously donated by Alan Kelly (the real MVP ). Now I don't know what was done in there but for the sake of the argument I'll assume a crap ton of red loctite.
If I remove the jet it is propable I'll find my mangled thread.
My question is do you think I could repair it with a helicoil?
Or too much of a risk of cracking the jet tower?

Cheers!

Sent from my Mi A2 using Tapatalk

Nurse Julie:
No, you cannot repair that area with helicoils.

Laverdaroo:
I dont think you said which carb it is,somebody on here might have a spare unit. If not,.....

https://www.cb-four.com/cgi-bin/shop/__Carburetor-Battery-Honda-CB350Four-CB400F-used__21-0375-S09_02.06.html


Dont look too bad and a working set for fair money.

allankelly1:

--- Quote from: Laverdaroo on December 27, 2021, 03:27:50 PM ---I dont think you said which carb it is,somebody on here might have a spare unit. If not,.....

https://www.cb-four.com/cgi-bin/shop/__Carburetor-Battery-Honda-CB350Four-CB400F-used__21-0375-S09_02.06.html


Dont look too bad and a working set for fair money.

--- End quote ---
Hi Roo

Hope you are well

That’s a good site and has a few bits at a good price

I shall add that to my list of favourites

Best wishes Al


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Laverdaroo:
Hiya mate, hows the back? You mending, albeit slowly?


It's a great site and always have the bits that nobody else does and they're super dooper efficient being over in Germany. I've had several 'get out of jail free' moments with them.

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