Loses speed when I throttle up

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jeffsaline
Hero of the Soviet Union - 2019
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Re: Loses speed when I throttle up

Post by jeffsaline » Tue Sep 10, 2019 8:49 am

Marco wrote:
Tue Sep 10, 2019 1:09 am
This was quoted from Jeff but I somehow erased that part.

"As I was reading your description of yesterday's performance I was thinking if I was working on this I would be pulling the carb tops and inspecting the slides and diaphragms (and making sure the slides move freely in the carb body bore) and while I was in there I'd also be making sure the needles were good. Then, because I was still messing with the carbs I would be pulling the float bowls and remove and clean the jets and passages." Jeff


So how do you tell if needles are good? Any advantage to the high performance aftermarket needles? Mine look fine but I wouldn't know what to look for.
Thanks,
Marco
Marco,

I would look at the needles to make sure the clips are in the same position on each side, the grooves in the needles are not worn and the needle tapers don't appear worn or deformed.

On a Ural I don't think there is any need for needles other than stock.

Best,

Jeff
Jeff Saline
2010 Gear Up
-Good, Fast, Cheap. Pick Two
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Marco
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Re: Loses speed when I throttle up

Post by Marco » Tue Sep 10, 2019 1:10 pm

Should shims be able to move freely when needle is lifted or should they remain stationary against base of needle?
2012 Gear Up "Anichka"
19,000 Km

"My mother never breast fed me, she told me she only liked me as a friend."
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jeffsaline
Hero of the Soviet Union - 2019
Hero of the Soviet Union - 2019
Posts: 325
Joined: Mon Dec 14, 2015 12:04 am
Location: Rapid City, South Dakota

Re: Loses speed when I throttle up

Post by jeffsaline » Tue Sep 10, 2019 3:34 pm

When people shim needles it is just to change the position of the needle in relation to the slide. Moving the needle higher allows more fuel sooner. The shim(s) just need to fit around the needle and the needle will hold the shim(s) in place.

Best,

Jeff
Jeff Saline
2010 Gear Up
-Good, Fast, Cheap. Pick Two
-Just because something isn't true, no reason you can't believe it. Hub McCann Second Hand Lions
-Anything is possible if you don't know what you are talking about.

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S 854
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Re: Loses speed when I throttle up

Post by S 854 » Tue Sep 10, 2019 9:51 pm

Marco wrote:
Tue Sep 10, 2019 1:10 pm
Should shims be able to move freely when needle is lifted...
Yes... up and down the needle...
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Marco
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Re: Loses speed when I throttle up

Post by Marco » Tue Sep 10, 2019 11:02 pm

Alright,
Thanks!
2012 Gear Up "Anichka"
19,000 Km

"My mother never breast fed me, she told me she only liked me as a friend."
Rodney Dangerfield

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