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Float height for dummies 14 Apr 2019 15:00 #802119

  • Trackerkz650sr
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Hey guys looking for some help on float heights vm24ss carbs

Basically no matter how i tune i got "choppiness" at higher rpms

It didnt seem to start doing it until i richened the tang on floats a tad
(They were bent in lean a little)


My main question is how do the pros get it right.i see a dry method of flipping the carbs upside down and measuring from float to gasket base

And also a wet method

My main question is i keep seeing adjustments for the floats but not info on the tang position on the float


Anyone got words of advice?


Much appreciated

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Float height for dummies 14 Apr 2019 15:17 #802121

  • Warren3200gt
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You need to set the float by the wet method. 2 to 4mm below the bowl mating surface. The height icrease or decrease from level of the tang to achieve that is irrelevant, its the fuel height that matters.
The valve needles from diffeŕent manufacturers would need the tang position different due slight differences in needle length and internal spring strength.

Z1000J2 somewhat modified!

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Float height for dummies 14 Apr 2019 16:18 #802125

  • slmjim+Z1BEBE
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When adjusting float tangs, the tiniest of increments produce relatively large changes in fuel height.

Dry float setting usually get floats in the ballpark. Wet adjustment is the most precise.

Some manuals specify fuel level as the distance between the carb throat's bore center and the top of the fuel pool in the float bowl.

Be prepared with generous amounts of patience & don't try to rush it.

Good Ridin'
slmjim & Z1BEBE
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Float height for dummies 14 Apr 2019 17:04 #802128

  • Trackerkz650sr
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Appriciate both your replys
Ill keep messin with it
I just got clear tubing today so ill try the proper method in the morning


On my last kz i remember just adjusting and riding until i got it right but i do recall when its off the bike would run like trash

Crazy how much the level effects everything

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Float height for dummies 16 Apr 2019 13:53 #802244

  • gordone
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I made some bracket so I could adjust and measure many times without installing the carbs each time.



1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
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The following user(s) said Thank You: Nessism, scubaanders

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Float height for dummies 16 Apr 2019 21:44 #802264

  • scubaanders
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Thats the Wway to do it.
In carb boots, carefully in a vise or why not in two pieces of hole plates.
Good work Gordone
/A
Gpz750R1 1982
Gpz750A1 1983
Gpz1100A2 1984
FZ750 1985
Gpz900R -91

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Float height for dummies 17 Apr 2019 05:47 #802270

  • martin_csr
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By slmjim+Z1BEBE: When adjusting float tangs, the tiniest of increments produce relatively large changes in fuel height.

+1. . I didn't want to mangle the floats, so instead of bending them, I flexed each tang x number of times. Flex, flex, flex with an appropriate tool, reinstall & check the fuel level. Then do it again. I spent a couple of hours & got all four to exactly 3.0mm below the carburetor body. To speed up the process you don't have to use all 4 float bowl screws per carb each time >> I used 2 per carb, some guys only use 1 screw per float bowl. Also, I rigged up a simple float support so the tangs were easy to flex, and like gordone I also made a carb stand >> 2x4s w 2x6 base & a couple of angle iron L-brackets plus a bungee cord.
....

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Last edit: by martin_csr.

Float height for dummies 17 Apr 2019 07:03 #802277

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martin_csr wrote: "... so instead of bending them, I flexed each tang ..."

:)

Early in my career as a Tech on analog photocopiers, my service manager made the observation that, "A good Technician never bends anything. He forms it."

That always stuck.

We're still good friends to this day, 40+ yrs. later.

Good Ridin'
slmjim
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1972 Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
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An enthusiast's forum focused exclusively
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Float height for dummies 17 Apr 2019 07:34 #802280

  • SWest
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The tang is the fine adjustment. If on too much of an angle it will cock the needle sideways and prevent it from sealing. It should be level with the arms. A lot of times the float arms get bent. You can bend them strait or down a little to get it in the ball park then bend the tang to get them right. The tang is brass so don't bend them too many times or they'll break. Metal fatigue.
Steve

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Float height for dummies 17 Apr 2019 09:40 #802286

  • hardrockminer
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On my Z1's I found that if I closed the float valve and measured the distance from the carb lip surrounding the bowl to the bottom edge of the float I could get very close if that distance was 16 mm. Of course the floats have to be in good condition...no bends.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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