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CB350 1971 Restoration Project

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florence:
My 350 always had problems with sticking slides, I've owned and ridden one for 40 years and they were always trouble, especially in wet weather. Sometimes they were happy and other times they were a pain.  In my opinion the carbs on these are not a great design so I changed mine to slide carbs (Amal concentrics in my case), i.e. non diaphragm, and it transformed the bike.  I know that is no good if you are after authenticity but in all honesty it is a vast improvement.  It runs brilliantly and throttle response is instant.  I would say it would depend on how much you want to ride the bike.

AshimotoK0:

--- Quote from: Bryanj on September 26, 2023, 02:26:30 PM ---Carb diaphragms maybe, was one on here a while ago with that problem, ds does pattern ones when in stock but aint cheap

--- End quote ---

His diaphragms are perfect Ken. 1st thing we checked when he took his carbs apart\

AshimotoK0:

--- Quote from: florence on September 26, 2023, 04:57:00 PM ---My 350 always had problems with sticking slides, I've owned and ridden one for 40 years and they were always trouble, especially in wet weather. Sometimes they were happy and other times they were a pain.  In my opinion the carbs on these are not a great design so I changed mine to slide carbs (Amal concentrics in my case), i.e. non diaphragm, and it transformed the bike.  I know that is no good if you are after authenticity but in all honesty it is a vast improvement.  It runs brilliantly and throttle response is instant.  I would say it would depend on how much you want to ride the bike.

--- End quote ---
I have a pair of 750 cabs that have been modified to fit the CB350 but never tried them. They were off a CB350K4 racer. Also the early SL350 had Keihin slide carbs.

Oddjob:

--- Quote from: AshimotoK0 on September 26, 2023, 07:00:23 PM ---
--- Quote from: Bryanj on September 26, 2023, 02:26:30 PM ---Carb diaphragms maybe, was one on here a while ago with that problem, ds does pattern ones when in stock but aint cheap

--- End quote ---

His diaphragms are perfect Ken. 1st thing we checked when he took his carbs apart\

--- End quote ---

But for how long Ash, never liked them myself. Always seem to hole for no reason..

AshimotoK0:

--- Quote from: Oddjob on September 26, 2023, 07:05:26 PM ---
--- Quote from: AshimotoK0 on September 26, 2023, 07:00:23 PM ---
--- Quote from: Bryanj on September 26, 2023, 02:26:30 PM ---Carb diaphragms maybe, was one on here a while ago with that problem, ds does pattern ones when in stock but aint cheap

--- End quote ---

His diaphragms are perfect Ken. 1st thing we checked when he took his carbs apart\

--- End quote ---

But for how long Ash, never liked them myself. Always seem to hole for no reason..

--- End quote ---

Yea agree that the carbs are crap on that model but when last checked diaphragms were fine ... more likely a blockage somewhere.

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