MK 1 Amal Concentric Float Needle

jms

jms

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Hi
Just fit the newer “stay up” floats to my MK1 Amal Concentrics. I’m hearing that the brass Viton tipped needle should be exchanged for an aluminum one. Anbody have experience with this? Is it really necessary?
 
jms said:
Hi
Just fit the newer “stay up” floats to my MK1 Amal Concentrics. I’m hearing that the brass Viton tipped needle should be exchanged for an aluminum one. Anbody have experience with this? Is it really necessary?
Click to expand...
I'm sure you will get many opinions. Amal switched away from the brass needle MANY years ago. Too heavy and may not seal as well.
 
jms said:
I’m hearing that the brass Viton tipped needle should be exchanged for an aluminum one. Anbody have experience with this? Is it really necessary?
Click to expand...

Yes change the brass needles for the aluminium type.

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Setting Fuel Level on Amal Mark 1 Concentric Carburetters | AMAL Carburetters

Guidelines for achieving optimal fuel level in Amal Mark 1 Concentric carburetters. Covers fuel level measurement techniques, & more.
amalcarb.co.uk amalcarb.co.uk

"Needle Valve​

If your float chamber is fitted with a brass needle valve, you may find the valve sealing under its own weight, before the float has risen far enough to press it shut. Symptoms of this problem can be that the carburetter takes a long time to tickle, hesitates on pickup and does not idle reliably. A Viton tipped aluminium needle valve is now available that overcomes this problem. It is now fitted as standard equipment to all new Mark 1 Concentric carburetters."
 
It's crazy that Amal didn't consider the ramifications of altering the balance of the float weight vs. the brass needle valve. If you're really cheap you could calculate the difference and counterbalance with a weight attached to the float (if you could figure out a way to attach it. Epoxy?) Regardless, I don't see how it could affect tickling since that's going to depress the float a fixed amount no matter what the balance is.
 

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