Carburettor query

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IanC
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Carburettor query

Post by IanC » Fri Jul 05, 2019 9:49 pm

My carb is running a bit lean, and even with the idle screws turned out 3 1/2 turns the plugs are too white. I had a look at the idle jets and found that they are unlike the ones I'm familiar with - different shapes although both are marked 45. Does anyone know what carb this is (so i can order parts) as I can't find any id marks on it.
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Carburettor query

Post by Crowther » Fri Jul 05, 2019 10:17 pm

Looks like a Weber 38 to me but the experts will be along shortly. I've just replaced my idle jets with new ones bought from Classic Carbs UK. Part numbers are 74403.45 and 74409.45...


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Carburettor query

Post by IanC » Sat Jul 06, 2019 7:13 am

Hi, thanks for that, that's exactly what i need to know. I've had a look at their site, the images of idle jets match both the numbers you give and the jets I've got.
Ian


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Carburettor query

Post by AJL Electronics » Sat Jul 06, 2019 8:44 am

Yes, later model 38. If you are lean, wind the screws out a bit more. Many cars run at around four turns out.


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Carburettor query

Post by IanC » Sat Jul 06, 2019 9:16 am

Many thanks AJL, I'll give that a try before doing anything rash. This 'different sizes/shapes' idle jets is a new one on me, I've had a few Scimitars over the years and this is the first time I've seen anything other than the two identical idle jet set up.


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Carburettor query

Post by Dennis Nicholas » Sat Jul 06, 2019 11:18 am

So that is two different shaped idle jets in the one carb?


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Carburettor query

Post by AJL Electronics » Sat Jul 06, 2019 12:11 pm

Dennis Nicholas wrote:
Sat Jul 06, 2019 11:18 am
So that is two different shaped idle jets in the one carb?
Certainly is. The carriers are slightly different each side too.


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