Float level adjustment?

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Twin Pinzies
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Float level adjustment?

Post by Twin Pinzies »

I've searched on this forum to no avail. My question remains...

If my float level is too high, do I add or do I subtract spacer/washers from the float needle?

It seems that adding the (1mm or .5mm) washers would increase the fuel and raise the level, so removing them would result in lowering the float level.
Is that how it works?
GRCameron
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Re: Float level adjustment?

Post by GRCameron »

Twin Pinzies wrote: It seems that adding the (1mm or .5mm) washers would increase the fuel and raise the level, so removing them would result in lowering the float level.
Is that how it works?
Just the opposite. The float needle valve is mounted in the carb cover. Lowering the valve (increasing washer thickness) lowers the float level.
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George Cameron
Yarnell, AZ
1979 Pinz 710M
Molon Labe
pinzinator
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Re: Float level adjustment?

Post by pinzinator »

Multiply the thickness of the washer by 4 to get the change measurement. A .5 mm washer will move the float 2 mm.
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Jimm391730
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Re: Float level adjustment?

Post by Jimm391730 »

George hit it on the head, but I'm going to state it differently:

Adding or removing washers happens under the SEAT of the needle valve. The floats push the needle up and down, so if the needle seat is RAISED (remember it is hanging upside down in the carb cover) by removing washers, then the needle (and the floats) have to rise up further to shut off the flow of fuel -- resulting in a higher fuel level.

If the needle seat is LOWERED (remember it is hanging upside down in the carb cover) by ADDING washers under the seat, then the needle (and the floats) are lowered before the shut off of fuel -- resulting in a lower fuel level.

Maybe this helps.
Jim M.
712W and 710M
Twin Pinzies
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Re: Float level adjustment?

Post by Twin Pinzies »

Thanks again guys...
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ako
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Re: Float level adjustment?

Post by ako »

As someone who also needs to check this, thanks to everyone above from me too.

Think I will save this info in a PDF daft sheet. :wink:
pinzinator
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Re: Float level adjustment?

Post by pinzinator »

I have the washers you need, PM me with the size.
Twin Pinzies
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Re: Float level adjustment?

Post by Twin Pinzies »

Oh yeah, another question...

What's the maximum number of washer/spacers that can be added?
My float levels were way high on a carb with one (1mm) spacer already in place.

Also, is there any issues with each carb having different float valve spacing in order to get them each within specs?
Twin Pinzies
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Re: Float level adjustment?

Post by Twin Pinzies »

Twin Pinzies wrote:
What's the maximum number of washer/spacers that can be added?
Anyone?.. Anyone?
pinzinator
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Re: Float level adjustment?

Post by pinzinator »

I don't think there is a maximum, but I would assume that 2 washers of the same or different sizes should do the adjustment. You want each carb to be at the right level, regardless of the number of washer in each. There are only 2 washer sizes, 1 and .5 mm. I don't believe there is a 2 mm version.
Twin Pinzies
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Re: Float level adjustment?

Post by Twin Pinzies »

Thanks pinzinator.
It's looking like I'm going to need a total of three (1mm) spacers to get my level down to specs then. I was worried that it might crush the valve into the floats...

Cheers!
pinzinator
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Re: Float level adjustment?

Post by pinzinator »

You are saying your fuel level is about 12 mm too high? No wonder your Pinz runs bad. Is the float bent somehow? I will check my washer inventory and get back you.
pinzinator
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Re: Float level adjustment?

Post by pinzinator »

.5 and 1 mm washers seems to be the only adjustment shims available.
JimmyC
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Re: Float level adjustment?

Post by JimmyC »

With it that far off, maybe something is broken rather than it being out of adjustment. Maybe the float valve is bad or has trash in it or maybe a float has absorbed fuel.
Jim Chance
710M

All my post fully incorporate the Dunning-Kruger effect
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ako
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Re: Float level adjustment?

Post by ako »

I'm with JimmyC, not had much experience on Pinz carbs but I have seen motorbikes with a crack in the float, so it doesn't float as much as it should.

Either that or the metal tab is bent our of shape.
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