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B175 Throttle Needle measurement please ?
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Sponge
Lancashire (A chip shop somewhere near Preston)
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June 4, 2021 - 1:55 pm
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It is currently almost impossible to obtain a new carb for my B175 project build so I am just building a 626 concentric from my stock of parts in the hope that it will keep me going until AMAL gets back into the swing. 

I know that there is something unique about the throttle needle fitted to the B175 bikes but cannot remember what....so is any kind soul out there able to tell me, please, what the exact length of the correct throttle needle should be for a 1971 B175 and I can then check to see if any of the needles in my tub will be useable ??     

Sorry if this is a faff but one of my pet hates is keeping on having to dismantle amal carbs once fitted on the bike. Onwards and upwards.

Sponge   

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BASIL
Hamstreet,Ashford.
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June 5, 2021 - 10:50 am
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Hi, what you need for a B175 is a 626/17 which is a fixed pilot jet however I have found you can make do with a 25 pilot jet if you don't have the one with the fixed jet, now you need a 4 stroke needle and needle jet don't ask me why but they only run any sense with this set up, and a 3 1/2 slide plus a 180 main jet, I have found Burlen systems very helpful with the parts and they usually come next day. Regards Basil. PS I have had 4 B175s

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Mannanan
Leigh On Sea, Essex. Uk.
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June 6, 2021 - 1:46 pm
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Sponge, the correct throttle needle for the B175 is 622/124. It is identifiable by two rings at the top of the needle and it has three clip options. The overall length is 2.677 inches of which 1.860 forms the straight part and 0.817 the tapered part. The tip diameter is 0.071. Hope this is of some use. ( all measurements in inches)

Ed.

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Sponge
Lancashire (A chip shop somewhere near Preston)
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June 7, 2021 - 12:49 pm
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Cortect parts ordered this morning. I now have confidence that once built and fitted I shall not have to dismount and strip that carb for a good while yet. Many thanks.

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