Questions about Amal carb parts.

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A friend is working on his Amals & ask me to post a few questions for him that he wasn't able answer from them or thier website. #1, Does anyone know if the Viton tips on the new needle valves are made with Viton type ( GF) apperantly there are many differant types of Viton & he thinks that the GF type is the best for ethonal laiden gas. #2) Amals site says we may have trouble with the Brass needle vales being to heavy & suggests we use the alluminum ones but the kits don't come with them, is this a issue? Has anyone needed to use the Alloy ones?? #3 Has anyone had trouble with the new stay up floats disolving in Ethonal /gas? I forgot the name of the material they are made from, but whatever it is does anyone know if it's the type "M" of that foam? Thanks.
 
When you say "brass needle valves" do you mean the slide needles? or are you referring to the short fat viton tipped "needles" that the floats operate upon to control fuel flow to the bowl?
 
I know I know... he's asking about the float needles. But I don't know the ethanol question but over a decade ain't heard any horror stories of them dissolving. I'd call the vendor supply for feed back on material and reports of failure. Al may or may no be better in the vibration blurred seating function. Ain't heard reports by me or other that was an issue once good floats and float level correct for 1.5 turns out best idle, each side. If higher flow needed a slot can be cut out just above seat to let more fuel flow than can get past the valve lever port area.
 
Nitrophyl floats work well but should be replaced every 5 years according to GM. They do have a tendency to get heavy with fuel after some time. However thousands of Jap bikes have been using them for much longer than 5 years.

http://www.rogerscorp.com/ec/nitrophyl_ ... ility.aspx

Can't tell you much about the viton needles other than to say I have not had problems with them. Jim
 
Nitrofil! That's the name I couldn't remember. My friend says there are differant types of it and only the type "M" stands up to modern gas, he wanted to know if we thought Amal was using it. I would guess yes if they last a few to five years. Now about the "Float needle" Amal's own site says people have had trouble with the Viton tipped "brass" ones being to heavy and flooding the bowls, Has this been a issue for anyone here? And Amal doesn't say if the tips are Viton GF but if knowone has had any problems with them swelling they must be. The bike he is working on has not been ridden in years so he is going through the carbs, I told him about the new floats and he just wants to be sure he gets ALL the right new parts. Thanks for your help. Glenn.
 
gtsun said:
Nitrofil! That's the name I couldn't remember. My friend says there are differant types of it and only the type "M" stands up to modern gas, he wanted to know if we thought Amal was using it. I would guess yes if they last a few to five years. Now about the "Float needle" Amal's own site says people have had trouble with the Viton tipped "brass" ones being to heavy and flooding the bowls, Has this been a issue for anyone here? And Amal doesn't say if the tips are Viton GF but if knowone has had any problems with them swelling they must be. The bike he is working on has not been ridden in years so he is going through the carbs, I told him about the new floats and he just wants to be sure he gets ALL the right new parts. Thanks for your help. Glenn.

As far as I know the "m" just stands for the density of the foam. The higher the density the heavier the foam is to start with but the heavier foam is less likely to absorb fuel. Jim
 
The new alloy needles work good but unless you are getting new ones, I don't know if I would swap them out just because, unless you have the old nylon ones.
The new floats are impervious to ethanol. It is one of the reasons they made them. The other reason is that the float height is adjustable without screwing around with the needle seat and float bowl casting.
 
They are resistant to ethanol but they are not resistant to benzine which is in some fuel blends. And if you go racing and use fuel that is oxygenated with toluene they will fail right away. Jim
 
Wow good to know. I think that clears up the questions, I guess the new rebuild kits do not come with the Alloy float needles so you have to order them by themselves. Must not be that big of a problem or they would be putting them in the kits! You would hope anyway. Thanks for clearing this up.
 
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