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Needle for a stromberg and K&N filter

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Stewart

Stewart

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What would be the correct needle for the ZS carb and a K&N filter? Also how hard is it to change the needle and is there anything else I would need to do at the same time?

Thanks
 
How about does anyone know what the stock needle fitted in the ZS carb is? Looks like moss only lists 3 choices and one of them is high alt.
 
Well the two ZS carbs I have both have 45H needles in them. Hope that helps. So, I guess that's the stock needle. You might not need to change the needle. I've noticed that the ZS air piston needle has a relatively large range of adjustment. So there's a chance that you might be able to get the mixture right without changing the needle.
 
Thanks you thank you thank you thats what I was looking for. Found out the hard way it wouldnt work with the stock needle. Put the k&n filter on and the engine was so lean with the needle full rich it wouldnt get beyond 3500 rpm in first gear.
 
ah well... in that case... have you figured out how to remove the needle? taking it out is as simple as removing the 4 screws that hold the dshpot cover on, pulling the cover off, lifting out the piston, setting the needle to full rich, and then loosening the "retension" screw in the side of the piston.
 
Ok figured some stuff about the Stromberg carb.

1. K&N filter will not work no matter what needle you use.
2. 1975 non Californian uses the 45G needle Californian uses the 45H the 45M is high altitude.
3. 76 on uses the 45H needle.
 
sounds like you might need to mod your needle. I've read that the needle can be made thinner by spinning it in emry paper (sort of grinding it down). In effect it would make the needle perform as though it were richer.

Another mod that I've seen and used first hand has to do with altering the needle assembly so that the needle resides slightly higher within it's housing. If you look carefully, you'll see that the needle is held within its housing by a pin. If you move the pin up towards the top of the housing by a small amount (say to the base of the threads), this would have the effect of giving you an extra turn or two towards richer.

It's something to tinker around with, and not too hard to do. However, it might be a good idea to have a spare needle on hand before you go messing with it.
 
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