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SOHC.co.uk Forums => CB750 => Topic started by: SteveCB750 on February 06, 2020, 08:42:46 PM

Title: Damaged carb
Post by: SteveCB750 on February 06, 2020, 08:42:46 PM

Hi all, stripped the carbs (657A LB designation) today to find that no1 was badly damaged with a crack on the air side. As soon as I touched it off it came in my hand   :(   Could anybody tell me if no1 is the same as no3. Also my bike being a K3 is this carb the same as K1-K6, I have seen a few on Ebay but they look pretty rough but once vapour blasted and cleaned should look okay. Anybody got a spare they don't need and would like to be free of or could recommend the best place to source a new or used body. Or would the body still be useable with this piece missing as the rubber still clamps securely. See picture.

Title: Re: Damaged carb
Post by: Trigger on February 06, 2020, 09:57:27 PM

Number 1 and number 3 are different. You will need a number 1 from a CB750 K1 to K6 or a F1  ;)

Title: Re: Damaged carb
Post by: SteveCB750 on February 06, 2020, 10:22:17 PM

Thanks Trigger, are all the carbs the same for the K1-K6 with different jetting as all the ones on eBay are 064A and mine are 657A.

Title: Re: Damaged carb
Post by: Bryanj on February 06, 2020, 11:07:22 PM

If i didnt bin them there was a set removed from plate hanging arround my lockup. Got to go there Saturday will look

Title: Re: Damaged carb
Post by: Trigger on February 07, 2020, 07:15:37 AM

Quote from: SteveCB750 on February 06, 2020, 10:22:17 PM

Thanks Trigger, are all the carbs the same for the K1-K6 with different jetting as all the ones on eBay are 064A and mine are 657A.

All are the same, even if you buy another set they will need a good clean and setting up so, change the jets from your damaged one  ;)

Title: Re: Damaged carb
Post by: SteveCB750 on February 07, 2020, 09:55:30 AM

Quote from: Bryanj on February 06, 2020, 11:07:22 PM

If i didnt bin them there was a set removed from plate hanging arround my lockup. Got to go there Saturday will look

Hi Bryanj, thanks I would be interested if you still have them let me know as I would prefer to buy from a member rather than Ebay.

Title: Re: Damaged carb
Post by: Bryanj on February 08, 2020, 01:25:58 PM

I have had a quick look and cant put my hands on them, i may have binned them as i dont do 750's and they were very incomplete, not even on the mounting plate. I will keep an eye out just in case tho.

Title: Re: Damaged carb
Post by: SteveCB750 on February 08, 2020, 02:48:03 PM

Thanks for looking Bryanj I think that I have found one in Cyprus which looks pretty good which I have made an offer on.

Title: Re: Damaged carb
Post by: TERRIBLEONE on February 10, 2020, 09:40:17 PM

I have a spare number one carb body, pm me if you get stuck mate. Cheers.

Title: Re: Damaged carb
Post by: SteveCB750 on February 10, 2020, 10:25:24 PM

Quote from: TERRIBLEONE on February 10, 2020, 09:40:17 PM

I have a spare number one carb body, pm me if you get stuck mate. Cheers.

Hey Terribleone, got one coming from the US but not 100% sure of the quality. Should be here next week so I will come straight back to you if its not so good. Will I never learn to wait a little, absolutely no patience  :( :(

Title: Re: Damaged carb
Post by: TERRIBLEONE on February 10, 2020, 10:37:29 PM

Hah, always the way. No problem mate. Here if you need it.