Author Topic: Looking for some carb advice please.  (Read 754 times)

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Online Pete

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Re: Looking for some carb advice please.
« Reply #15 on: January 09, 2019, 10:01:37 pm »
I'd guess Read What Was Said, but could be wrong ?????
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Offline grsymes

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Re: Looking for some carb advice please.
« Reply #16 on: January 09, 2019, 10:03:10 pm »
Once I get a carb, I need to get a main jet and needle suitable for the engine, is that correct?
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Offline Owen

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Re: Looking for some carb advice please.
« Reply #17 on: January 09, 2019, 10:07:26 pm »
Spot on Pete and yes if you go for another type of carb you will need to get the needle,  jet and slide to match.
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1945 C10 & C11
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Anyone want a B20 in need of a lot of tlc

Online Pete

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Re: Looking for some carb advice please.
« Reply #18 on: January 09, 2019, 10:16:15 pm »
I would try for the right carb myself. They do come up on ebay, depending how desperate you need one? A modern one would stick out like a sore thumb, and niggle you for ever............or not. You could always sell it on if it's really not suitable. You would never get your money back on a new one.
"BSA C10 C11 C12 Badges For Sale"

1948 BSA C11
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Offline grsymes

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Re: Looking for some carb advice please.
« Reply #19 on: January 09, 2019, 10:22:10 pm »
I'm starting to get a better understanding. I always thought the whole unit was was specific to an engine which made me afraid of wasting time/money on getting an incompatible carb.
1949 Rigid Frame ZC10 5687
1950 Engine ZC11 11149
Slowly coming together

Online Pete

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Re: Looking for some carb advice please.
« Reply #20 on: January 09, 2019, 10:51:10 pm »
Here's one. Needs a better float lid and maybe new internals, but probably doable for £100 and would be the right carb. I'm not advising buying it, just saying
https://www.ebay.co.uk/itm/Amal-pre-monobloc-BSA-c11-274-AU-1DA-CARBURETTETR-25-32-1949-53/323638828236?hash=item4b5a609ccc:g:SwEAAOSwz2JbVh1M:rk:6:pf:0
I'm tempted myself, as mine is cream crackered, but the bike runs fine on it, so I'll leave alone.
Pete
« Last Edit: January 09, 2019, 10:55:49 pm by Pete »
"BSA C10 C11 C12 Badges For Sale"

1948 BSA C11
1932/56 C12Rudge

Online hampshirebiker

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Re: Looking for some carb advice please.
« Reply #21 on: January 09, 2019, 11:02:03 pm »
Earlier he said he didn't want one that needed any work as he "didn't have a clue". This could go on forever and I have a feeling that we've been there before.
Postal - Liphook Hants - But just into West Sussex.

Offline cerullos1

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Re: Looking for some carb advice please.
« Reply #22 on: January 10, 2019, 12:59:41 am »
I have a rebuilt carb     that I might let it go.  I live in Canada

Offline timsdad

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Re: Looking for some carb advice please.
« Reply #23 on: January 10, 2019, 06:47:17 am »
Sometimes you're such a pessimist, hb! My advice was based, as always, on what I'd do myself - I've never bought a new carb and have overhauled and repaired hundreds. Perhaps, as Owen likely noted, you need to read and digest my previous post. This is also based on cost because we never know what other folk's financial situation is and I like spending other people's money about as much as I like spending my own.


Yes, as I noted, Mr GR, you just need to get a carb of the correct size - a 25/32" Monobloc or a 622 Mk 1 Concentric that will be a lot cheaper. This carb needs to be for a four-stroke, most of them are, rather than a 2 stroke that will have the wrong type of slide and much bigger jets. I know it's starting to get a bit complicated but it's not, really, - when your carb arrives you need to strip it out and look at the sizes of the jets, slide and needle. If everything is thereabouts it will run fine but needs about a size 100 main jet to prevent buggering anything up. Anything else that's incorrect will do no harm and will likely be fine on an old C.

You can change the complete spec of a 622 Amal carb with about twenty five quid's worth of genuine parts if it's for a completely wrong engine but will probably get away with just the main jet. If you get a minor problem in the future you can just change the needle but they are very forgiving. Like I am!

Anyone who can't tackle a simple job like a carb strip really needs to be riding a new Honda!


Ray

Just a motorcyclist.

Online hampshirebiker

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Re: Looking for some carb advice please.
« Reply #24 on: January 10, 2019, 07:36:08 am »
Ray, I merely quoted what the man said. It's no good keep telling him how easy it is, if he can't do it. Without being rude, it didn't take me long to work out that he didn't have a clue.
Postal - Liphook Hants - But just into West Sussex.

Offline grsymes

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Re: Looking for some carb advice please.
« Reply #25 on: January 10, 2019, 07:42:56 am »
You have all given me things to look into.
Funds and experience are limited for me. I'd much rather have a working unit to learn from rather than blindly trying to put together something that has missing or damaged parts. I have only really worked on small diesel engine before, which don't have carbs.

cerullos1, I'll pm you about that carb later. Thanks
1949 Rigid Frame ZC10 5687
1950 Engine ZC11 11149
Slowly coming together

Offline timsdad

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Re: Looking for some carb advice please.
« Reply #26 on: January 10, 2019, 08:17:02 am »
Just trying to give folk a bit of self confidence, hb - just like I do you!

A can't see why anyone would buy an old Brit bike if they didn't want to get into messing around with carbs and things. The very fact they've bought a pre-unit C to dip their toe in the water usually means they can't justify a brand new carburettor.

An Amal is much easier to strip and set up than a Lister injector pump, Mr G! I may have a carb that's a bit closer to home - I'll have a look.


Ray
Just a motorcyclist.

Online Pete

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Re: Looking for some carb advice please.
« Reply #27 on: January 10, 2019, 08:45:16 am »
Look at the pleasure Andy got from having a go himself on this recent thread https://bsac10c11c12.co.uk/smf/technical/wiring-12108/
Ok, it was a dynamo, not a carb, but a good result, with a boost of confidence thrown in.
"BSA C10 C11 C12 Badges For Sale"

1948 BSA C11
1932/56 C12Rudge

Offline ianinglis

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Re: Looking for some carb advice please.
« Reply #28 on: January 10, 2019, 07:38:25 pm »
i have 274's monoblocks and a "new" 622 concentric and have tried them all in various guises on both my bikes

the 622 concentric is worn out at 5000 miles so i would agree with HB and get a monoblock old or new whatever you can afford - very robust and easy to get bits

any 274 is going to be tired



ian
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Online Tman

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Re: Looking for some carb advice please.
« Reply #29 on: January 10, 2019, 08:18:49 pm »
So how does the positioning of the float (Mono vs Conc) affect the carb's durability?
An old worn Mono is no better than an old worn Conc. :-\