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Old 24-07-2006, 09:26 AM   #1
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Float levels...

Hutchy/Burty/Anyone?....

Float levels on these carbs... XR2 (?) ... set the same as the single float types..IE level with the top of the chamber?... or not?
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Old 24-07-2006, 11:30 AM   #2
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Unless I've already lent it to someone else, I've got a V6 factory service manual ya can borrow if ya want.
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Old 24-07-2006, 12:11 PM   #3
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Manual states,

Invert fuel bowl and check float drop as shown in fig 54. It should be 1/16" from top off float to carburetor body, adjust if necesary by bending float tab
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Old 24-07-2006, 12:24 PM   #4
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Old 24-07-2006, 12:37 PM   #5
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Cheers Roofer/Matt 1/16" it is then...
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Old 24-07-2006, 03:33 PM   #6
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Are you saying that the top of the float should be inside / below the carb body by 1/16 or above / outside the carb body?

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Old 24-07-2006, 04:00 PM   #7
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Quote:
Originally posted by Cyco
Are you saying that the top of the float should be inside / below the carb body by 1/16 or above / outside the carb body?

Cheers
Cye
Clymer manual states 1/16" below But just checked my mercury service manual which says float even with bowl edge inverted.
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Old 24-07-2006, 04:28 PM   #8
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Quote:
Originally posted by Cyco
Are you saying that the top of the float should be inside / below the carb body by 1/16 or above / outside the carb body?

Cheers
Cye
Roofer's picture shows the float to be 1/16" proud of the body. The manual I have got which only covers carbs with one common float chamber per "barrel" indicates "level" with chamber edge.
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Old 25-07-2006, 08:29 AM   #9
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Question Above or Below

Which is correct then?
After checking my Carbs I would guess above.

Someone must know.
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Old 25-07-2006, 10:35 AM   #10
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It'll only be parallel with the chamber edge at one setting because it pivots. Too high it'll be nose up and too low it'll be nose down.
Anyway, providing there is no flat spot as the motor moves from slow run to the main system, it'll make feck all difference. The number of mm lift the engine will be sucking will make one mm insignificant.
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Old 25-07-2006, 01:29 PM   #11
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Question What

Quote:
Originally posted by jw.
It'll only be parallel with the chamber edge at one setting because it pivots. Too high it'll be nose up and too low it'll be nose down.
Anyway, providing there is no flat spot as the motor moves from slow run to the main system, it'll make feck all difference. The number of mm lift the engine will be sucking will make one mm insignificant.


What do you mean?
Can you explain in English please.
Slow run to main system?
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Old 25-07-2006, 01:31 PM   #12
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Yeh, transition from slow speed to high speed jets.
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Old 25-07-2006, 01:35 PM   #13
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Ok what about the rest of it?

What affect does the wrong float level have on the engine?

And does anyone know yet if the 1/16" measurement is above or below.
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Old 25-07-2006, 01:45 PM   #14
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I'd go with the mercury workshop manual which states even with bowl edge with bowl inverted
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Old 25-07-2006, 04:56 PM   #15
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Quote:
Originally posted by Cyco
Ok what about the rest of it?

What affect does the wrong float level have on the engine?

And does anyone know yet if the 1/16" measurement is above or below.
Cyco, there's a bit of explanation here, post #28

http://www.rib.net/forum/showthread....highlight=idle

I know it's not for a Merc performance motor but most fixed jet carbs use the same principle.

On a performance motor, you can often find the change over from the slowrun to main system by cruising at tickover and opening the throttle slowly. As the speed increases, there may be a rough patch which you pass through by further opening the throttle. This is the transition from the slow to main sytem. In normal use, it's likely you open the throttle firmly and pass through this without noticing it.

The reason the float level matters is that the fuel for the main system is being lifted to the nozzle, if the float level is, say, 1mm too low, the fuel will be 1mm late at the nozzle and there will be a wee weak flat spot. Similarly, if it's a bit high, there will be a wee rich flat spot.

On some motors, because the carbs are so simple in design, it may not be possible to eradicate completely the rough patch. When the fuel just begins to issue from the main nozzle, it'll likely be a bit spluttery (the fuel, that is) before it is flowing firmly.
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Old 26-07-2006, 09:24 PM   #16
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Righto…. Definitive answer is….. floats should be level with the top of chamber and NOT 1/16” proud as per the Clymer manual/diagram… Guess who set ‘em at 1/16” and fuel pissed out ?… reset to level… Thanks Hutchy you are a star ! .. and problem solved… reed plate warped and pissing out the joint…… roughly levelled by force… ‘cause we ain’t got a spare and out of time… and “Hey Presto” Sweet as a nut….

.. I foresee a full strip down coming on to “do it all proper, like” soon…

Once again.. Thanks to Hutchy for the parts… and being on the end of the phone… when we run out of ideas…

.. now all (?) we got left is to change out the leg and Gav’ll be ready to…..... Break it all again!

PS…… JW ? 1.6 mm makes a shit load of difference on these carbs… dunno why… but sure as feck does…
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Old 26-07-2006, 09:45 PM   #17
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Just to re-iterate what Jono said, thanks Hutchy for the parts so quickly! and the spot on info for the carbs

And above all thankyou Jono for spannering me motah up! nice one geeza!
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Old 26-07-2006, 11:09 PM   #18
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I asked Nick Barsch just yesterday and he said level with the gasket face when inverted which is basically the same as stated above!!!
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