SOHC.co.uk Forums > SOHC Singles & Twins
My first project - 1974 CB360 K0
Craizeehair:
--- Quote from: AshimotoK0 on January 02, 2024, 07:21:33 PM ---You can get replacement pattern diaphragms from the likes of NRP. Not sure how well the originals will stand up to E10 fuel even if NOS.
--- End quote ---
Thanks, am I best to replace the whole thing rather than just the diaphragms though given the damage, or will that make no difference to the operation?
Oddjob:
I was reading somewhere recently which said the original rings and stuff in carbs were viton based.
AshimotoK0:
Genuine Keihin OEM slide/diaphragm assemblies NOS are going to be very expensive, that's even if you can find them NOS.
Interested to hear what others say but even though the bottoms of your slides look grotty, I don't think that will affect the operation. Maybe gently file away anything that is above the flat surface.
I would be wary of any replacements with the slide included from China... better to use your originals. The DS ones don't really state the origin and he has been subject to selling some junk repro stuff recently. That's not to say the diaphragm assemblies are no good but need more info from them.
These people have a good reputation and state that their diaphragms are Vitonâ„¢ and don't require cutting of the plastic ring.
https://nrp-carbs.co.uk/shop/index.php?route=product/product&product_id=5660&search=honda+cb360
K2-K6:
Agree with assessment already posted, looks like the main jets and needle had become stuck in old solidified fuel, then someone has got a lever in there to pry them loose.
Damage looks worse than the effect it will have in practical use. The primary air control is with the butterfly plates, these slide just responding to relative vacuum below and above the slide to hold parity and place the needle metering in proportion.
Cleaning off the raised bits carefully to bring the profile back to original would be my planned course of correction. Their mass and overall dimensions likely only affected in such a minor way as to be insignificant in operating accuracy.
Craizeehair:
Thanks for all of the responses, very helpful indeed.
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