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Which Carb

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Which Carb

Post  banjo boy on Sat May 13, 2017 10:12 pm

Hi all

I have just been on Surrey cycles web site to look at a carb kit for my 1960 model 87 the carb on my bike is a 389 but the search on there site said 276 could any one enlighten me on this have I the wrong carb on my bike or is the info incorrect, also has any one used the cone filters on the bike instead of the round pancake type and wonder if they are ok many thanks.

Laurence
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banjo boy

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Re: Which Carb

Post  Kim on Sun May 14, 2017 1:47 am

banjo boy wrote:Hi all

I have just been on Surrey cycles web site to look at a carb kit for my 1960 model 87 the carb on my bike is a 389 but the search on there site said 276 could any one enlighten me on this have I the wrong carb on my bike or is the info incorrect, also has any one used the cone filters on the bike instead of the round pancake type and wonder if they are ok many thanks.

Laurence


The Amal site lists the 376 for the Falcon 87. I'm guessing it's a typo on the Surry cycles site.
http://amalcarb.co.uk/carbspec/carburettor/spares/id/5136/
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Carburettor

Post  piston 197 on Sun May 14, 2017 6:05 am

As Kim says the correct carb is a 376 monobloc, the 276 is a remote float chamber type discontinued after 1956
The correct code for your bike is 376/231 which is a 1" bore body, all 389 carburettors are bigger than 1" so unless someone has opened out the inlet hole in your barrel to suit the bigger 389 then there will be a mismatch of diameters causing poor flow ?
JH
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Re: Which Carb

Post  banjo boy on Sun May 14, 2017 11:59 am

Hi Gents

Thank you both for your help, sorry it was a typo error on my behalf I should have put 376 thank you Kim for the Web address and finally I miss read my carb it is a 376 series and not a 389 so will pay more attention when checking my info Embarassed which leads me on to the stay up kit my carb as the original float which I think is giving me issue as any used this kit.

Laurence
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carb float problem

Post  piston 197 on Sun May 14, 2017 12:10 pm

Most carb float problems can usually be traced to either a hole in the float and it partially filling with petrol, or worn needle and seat, if your float is not leaking (shake it and see if there is any petrol in it) you are mostly likely to just need a new fuel shut off needle and seating ? Seating can be shimmed to give correct fuel height in float bowl
JH
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Re: Which Carb

Post  banjo boy on Sun May 14, 2017 1:08 pm

Thank you John for you info will try giving the float a shake,I did replace the needle 2 year ago and jets but not the seating so will check this out thanks again for your valuable input .
Laurence
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banjo boy

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falcon87 carb Amal

Post  peter@dunfordconstruction on Sun May 14, 2017 3:48 pm

Hi Laurence,

Just refurbed My 376/231 Amal Monobloc with all necessary parts from Amal @ Salisbury

Main jet 180 Pilot jet 30 Slide No 31/2" Needle jet .106" needle position 2nd notch from top.

Its perfect now really good service from them,

Peter

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http://peter@dunfordconstruction.co.uk

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Carb parts

Post  kerabo on Sun May 14, 2017 5:38 pm

You know you can get all parts from AMAL it's all very clear. Unless Surrey cycles are selling genuine AMAL parts I would keep with the real thing.
I fitted a concentric to a bantam that I think was from them to a Fboc members Bsntam bike and it would hardly run. Put the real thing on and it was perfect.
Unless the bore is worn you can get everything.
Regards Ken
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Re: Which Carb

Post  banjo boy on Sun May 14, 2017 7:48 pm

Thank you all for info input,I put new jets in 2 yrs ago, I have cleaned out carb several times blown air line through but the bike pulls good for a while but then will go sluggish and the bike doesn't seem to run smooth and when I open up it feels like it wants to go but is holding back as if is choked and then clears the plug is showing it is running good,nice light brown and clean gap I am not sure what route to go refurbish this carb with new genuine Amal parts or buy a new one,I have an inline fuel filter could this be giving me this issue, I like this bike and really like to get it sorted I have ridden another members 87 and it seemed to pull when you open up the throttle , my bike starts 2nd 3rd kick and ticks over nicely.

Laurence

Ps the carb was sonic cleaned by my friend when I rebuilt it
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Carb

Post  kerabo on Sun May 14, 2017 8:32 pm

Does it start ok.
Does it need lots of flooding to start?
I would be inclined to check the float height to start with.
What air filter do you have?
What fuel oil mix are you using?
Although the lever is off is he choke off in the carb?
Regards Ken
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Re: Which Carb

Post  banjo boy on Sun May 14, 2017 9:15 pm

Ken
The bike starts ok
It needs a lot to start from cold but one started it doesn't need tickling
Air filter is pancake type with paper filter was looking at the cone type as I was thinking air flow was restricted,
Fuel oil mix is fully synthetic silkoleen st 33:1 and went down a size on all jets I am happy with the mix
Not sure about the choke so will check this out thank you for help here.

Laurence
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banjo boy

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Carb

Post  kerabo on Sun May 14, 2017 9:30 pm

Try it without that air filter.
When I rebuilt mine it would only do 40 and no power. The paper filter was getting sodden in fuel and oil and blocking the intake.. Changed that it when like a rocket.
Your mix and jets is the same as mine so should be ok but the fuel height is critical but start with that filter.
Ken
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kerabo

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Re: Which Carb

Post  banjo boy on Mon May 15, 2017 11:26 am

Hi ken my paper filter is a bit sodden with oil my carb set up is what you sent me when I was building my engine,I will try with out filter see how is gets on.

Laurence
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Carb

Post  kerabo on Mon May 15, 2017 11:54 am

banjo boy wrote:Hi ken my paper filter is a bit sodden with oil my carb set up is what you sent me when I was building my engine,I will try with out filter see how is gets on.

Laurence
Let us know the outcome

Regards Ken
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Re: Which Carb

Post  banjo boy on Mon May 15, 2017 7:34 pm

Hi Ken I removed the filter tonight went for a run out,what a difference pulled stronger ,I am thinking of getting the filter that is coned with wire mesh a bit like K&N which screws on but will also check the float level and perhaps replace it with a stay up plastic one,thanks again for your help

Laurence
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banjo boy

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Carb probs

Post  kerabo on Mon May 15, 2017 7:40 pm

If it's not flooding and if it starts normally so needs choke maybe you should leave it till you have done a few miles and know how it goes.
A wire filter will be best. The originals are a bit hard to find now.
Bit of a rough night to be road testing Very Happy
Ken
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Re: Which Carb

Post  banjo boy on Mon May 15, 2017 8:21 pm

It's not flooding but needs choke to start an a little tickle didn't go far about 5 miles it wasn't to rough but we are hard around here Very Happy
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Re: Which Carb

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