125 float height (again!)

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Icecreamman
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125 float height (again!)

Post by Icecreamman »

Had to pull and clean my carb. Figured I’d adjust the float. Read somewhere that standard GY6 is ~18mm but that’s too low. Thinking to bump it up to ~16 or just eyeball it but does anyone know the right float height?
sc00ter
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Re: 125 float height (again!)

Post by sc00ter »

From the service manual:
20241102_143159.jpg
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20241102_143209.jpg
sc00ter
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Re: 125 float height (again!)

Post by sc00ter »

You'll have to translate that via a online conversion calculator.
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DeeDee
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Re: 125 float height (again!)

Post by DeeDee »

I do it by eye. Turn the float upside down and get the dowel to balance on the metal tab. You want to see about 1/32" on each side. Gently bend the tab to reach this. To confirm, place a piece of hose on the fuel inlet, float on the left. Blow through the hose and slowly rotate the carb until the float needle stops air. The float seam should be vertical w/ the carb bowl edge at about 12:45 as shown in the photo.
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1/32" gap on each side of the tab.
1/32" gap on each side of the tab.
20241102_155919.jpg (139.63 KiB) Viewed 1496 times
Flow stops here.
Flow stops here.
20241102_160154.jpg (194.1 KiB) Viewed 1496 times
Less chit chat, more riding, Buddy 50, 125, 170i, RH50, Yamaha C3
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DeeDee
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Re: 125 float height (again!)

Post by DeeDee »

Also, why adjust your float level in the first place? Unless someone has screwed with it, these rarely need touched.
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DeeDee
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Re: 125 float height (again!)

Post by DeeDee »

Change the bowl screws to allen head.
Last edited by DeeDee on Sun Nov 03, 2024 2:12 pm, edited 1 time in total.
Less chit chat, more riding, Buddy 50, 125, 170i, RH50, Yamaha C3
Icecreamman
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Re: 125 float height (again!)

Post by Icecreamman »

Thx! Mine doesn’t have that. Tells me how to check it but that’s all. I’ve gotta pull it back off so I’ll double check myself but I’m pretty sure I set it ~18 and it starves when I get on it. Will report on progress.
sc00ter wrote: Sat Nov 02, 2024 6:34 pm From the service manual:20241102_143159.jpg
Icecreamman
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Re: 125 float height (again!)

Post by Icecreamman »

I was in there and I’m just kinda like that.
DeeDee wrote: Sat Nov 02, 2024 10:17 pm Also, why adjust your float level in the first place? Unless someone has screwed with it, these rarely need touched.
Icecreamman
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Re: 125 float height (again!)

Post by Icecreamman »

Got an 08 150 if it matters. My manual says measure perpendicular to the main jet. I’ve got 17.5. Eyeball says ~15. Will report progress.
Icecreamman wrote: Sat Nov 02, 2024 11:21 pm Thx! Mine doesn’t have that. Tells me how to check it but that’s all. I’ve gotta pull it back off so I’ll double check myself but I’m pretty sure I set it ~18 and it starves when I get on it. Will report on progress.
sc00ter wrote: Sat Nov 02, 2024 6:34 pm From the service manual:20241102_143159.jpg
Icecreamman
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Re: 125 float height (again!)

Post by Icecreamman »

15’s a little wet but maybe I can lean my mix some and make it work. 16’s probably about right. 18’s definitely too dry.
Icecreamman wrote: Tue Nov 05, 2024 7:06 pm Got an 08 150 if it matters. My manual says measure perpendicular to the main jet. I’ve got 17.5. Eyeball says ~15. Will report progress.
Icecreamman wrote: Sat Nov 02, 2024 11:21 pm Thx! Mine doesn’t have that. Tells me how to check it but that’s all. I’ve gotta pull it back off so I’ll double check myself but I’m pretty sure I set it ~18 and it starves when I get on it. Will report on progress.
sc00ter wrote: Sat Nov 02, 2024 6:34 pm From the service manual:20241102_143159.jpg
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DeeDee
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Re: 125 float height (again!)

Post by DeeDee »

Messing with your air/fuel screw has nothing to do with this. That is air fuel ratio at idle, float height is about how much fuel fills the bowl how often. You're starving because the flow of fuel stops to the bowl before it is full. Maybe go in and turn the valve adjustment nuts a little for the hell of it.
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Icecreamman
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Re: 125 float height (again!)

Post by Icecreamman »

IDK. I’m upjetted so maybe that’s affecting things. Currently I’m running ~16mm and ~1 3/4 turns and it’s reasonably content.
DeeDee wrote: Thu Nov 07, 2024 2:44 pm Messing with your air/fuel screw has nothing to do with this. That is air fuel ratio at idle, float height is about how much fuel fills the bowl how often. You're starving because the flow of fuel stops to the bowl before it is full. Maybe go in and turn the valve adjustment nuts a little for the hell of it.
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