Needle Numbers

[stephenlilley]

Can anyone tell me what needles I have in my HS4 carbs. They are stamped ABA, I cant find any reference to them.
Thanks
Steve Lilley

[dbazdavies]

Re: Needle Numbers

http://sucarb.co.uk/?SID=li23gnet8lcdkdb5flj4sq8732&___store=su

they should offer a correct needle for what ever engine mods you have !!

[dbazdavies]

Re: Needle Numbers

ABA is a good needle number for the HS4 carb

http://www.mintylamb.co.uk/suneedle/

click on HS4 carb.. on the top line

[stephenlilley]

Re: Needle Numbers

Thanks for your replies chaps. The reason I ask is I have just dyno tested my Roadster and it shows it is running lean from around 40mph. I am thinking of using a size 6 or 7 to enrich it. Any thoughts?
Thanks.

[lil_red_roadster]

Re: Needle Numbers

Depends on state of tune.
Fitting a K&N or other freeflow filter will usually mean a richer needle is required over standard to compensate for improved airflow...IIRC for an MGB-spec 18v engine running K&N with no other mods then AAA needles were a recommended upgrade.

[stephenlilley]

Re: Needle Numbers

Thanks for that info, Will look at the spec of the AAAs. Engine is bog standard apart from Stubby stacks fitted which massively improved airflow.

[cameronfurnival]

Re: Needle Numbers

AAA should be a good place to start - going much richer may throw up further problems. Check tappets are accurate too!

aaa1.jpg

[stephenlilley]

Re: Needle Numbers

Thanks Cameron, very informative graph.

[stevejgreen]

Re: Needle Numbers

I have scans of SU needle data, but not yet uploaded. I always found it interesting that a 1.3 mini used the same needles as a 1.8 TC!

[dbazdavies]

Re: Needle Numbers

I used to ring Burthem and they told me what to use !!

[stephenlilley]

Re: Needle Numbers

Thanks for the further info chaps, I have not heard of Burthem, could you post the phone number?

[cameronfurnival]

Re: Needle Numbers

Burlen ltd
Spitfire House, Castle Road, Salisbury, Wiltshire SP1 3SA
01722 412500
they will be able to tell you everything you need to know and probably more beside

[Alan c]

Re: Needle Numbers

I would have whoever did your rolling road fit the jets and retest - I had mine done and even after the operator rejetced it he took another hour of adjsutments to get the mixture righ over the whole rev range - it was not just fit and problem solved.