Linkert m74b excessive fuel

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DaCs
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Linkert m74b excessive fuel

#1

Post by DaCs »

Hello again.

I know you may someone already asked these. I have tried to find a reference but I have not been able to solve it. The carburetor lets pass a lot of fuel, which makes the spark plugs dirty and difficult to start. I cannot keep it at a good rhythm without it turning off due to excess fuel. I have tried to adjust it with a rich and poor mixture but I do not know if in addition to the high and low lever there is something (inside maybe) that allows to restrict the excess of gasoline that passes.

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Re: Linkert m74b excessive fuel

#2

Post by Excalibur »

Inside the low speed needle knob is a tiny spring. Could be that spring is installed incorrectly. It needs to be fitted so it's pushing the needle downward.
This is a fairly common assembly error that comes up occasionally. Easy to check and easy to fix. Good luck, hope this helps..
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Re: Linkert m74b excessive fuel

#3

Post by kitabel »

Tour float level may be too high, or your needle & seat is leaking.
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Re: Linkert m74b excessive fuel

#4

Post by DaCs »

Ok I will check that parts.

Anybody know what the correct low speed needle length should be? I'm thinking that maybe this is shorter or another model needle.

Regards
kitabel
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Re: Linkert m74b excessive fuel

#5

Post by kitabel »

IDK, but if the carb history is unknown you may have the wrong internal parts, including venturi, main nozzle.
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Re: Linkert m74b excessive fuel

#6

Post by DaCs »

I found that low speed needle sells from 1948-1965 models in 3" 1/2 and 4" total lenght, what determinates that difference?
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Re: Linkert m74b excessive fuel

#7

Post by kitabel »

There are at least 9 different carburetors in that range, and many body castings.
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Re: Linkert m74b excessive fuel

#8

Post by DaCs »

This is my carb


Image
Image
Image
Image
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Re: Linkert m74b excessive fuel

#9

Post by nmaineron »

If the offset of the float isn't correct, the float will hang up. You don't say which type of float you have. If you have a tin float it can have gas in it causing it to be heavy and not float well. If that is your problem there are newer floats that are better.
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Re: Linkert m74b excessive fuel

#10

Post by RooDog »

I recommended a Rubber Ducky float to a buddy, and he loves it....
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Re: Linkert m74b excessive fuel

#11

Post by DaCs »

I just know is modern plastic, but I dont see if is rubber duck or v-twin brand
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Re: Linkert m74b excessive fuel

#12

Post by RooDog »

A genuine Rubber Ducky should be marked....
Harley rubber ducky float.jpg
Harley rubber ducky float.jpg (49.01 KiB) Viewed 577 times
DaCs
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Re: Linkert m74b excessive fuel

#13

Post by DaCs »

kitabel wrote: Tue Oct 26, 2021 4:20 am There are at least 9 different carburetors in that range, and many body castings.
I bought the manual on the Victory page through paypal, I am trying to contact them but it seems that the email is not active, do you know how I can contact them to confirm that they received my payment? Cheers
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Re: Linkert m74b excessive fuel

#14

Post by DaCs »

RooDog wrote: Wed Oct 27, 2021 2:49 pm A genuine Rubber Ducky should be marked....

Harley rubber ducky float.jpg
I will take a look, thanks
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Re: Linkert m74b excessive fuel

#15

Post by Excalibur »

Might be worth testing how well it floats. In the pic I'm checking buoyancy by floating in gasoline/petrol..
lik.JPG
lik.JPG (49.86 KiB) Viewed 530 times
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