Upon rebuilding my NH carb I came across a delemma, installing a new viton needle and seat, I matched the old seat up with the new one, (thread depth) and found the new one was quite longer. The delemma, while reading old posts about seat gasket problems, I didn't think the seat was fully seating against the gasket so I filed the seat (threaded side) down to the same hight as the old one. Now the float is alot higher. I know the float can still be adjusted but it just doesnt seem right. Has anyone else experienced this or done the same? Doug
I haven't, because after having trouble from the rubber tip sticking I use the original needles.
Ashley at Langs said they cant get the originals anymore. So I had to buy the rubber
The reason we made copies of the original is for that very reason, but the real reason was the hole in the seat was too small. Yes, they are all gone now, but it's time for someone else to take over making them right!
That's something else to watch for at swap meets.
Unless the bit on tipped needle is actually sourced from some other common carb, wouldn't it be easier and cheaper for the makers of these things to be putting out new steel ones?
I tried the Viton needle. Worked great for about two years, then began to leak. Back to a new original steel type (and seat), and no problems for the past 6 years.
I overhauled my leaky NH carb about four years ago using Lang's rebuild-kit which had a Viton needle. -So far, it has worked out quite well. -My engine runs very nicely and the carb doesn't leak anymore. -Guess I got lucky.