float level
Moderators: oldjapanesebikes, H2RICK, diamondj, Suzsmokeyallan
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- Around the block
- Posts: 74
- Joined: Fri Sep 14, 2012 3:00 am
- Country: Australia
- Suzuki 2-Strokes: ts125, ts185, gt750k, gt750j
- Location: central west, New South Wales
float level
Hi guys, Have been off line for only five years (have had a few life problems). Dug 1973 GT750k out of back of shed to try to finish project. Having problems with float level, fuel leaks out of carbs at bowl gasket. set at 27mm.
- jabcb
- Moto GP
- Posts: 4251
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: float level
Congrats on getting through life's problems & getting back to your Suzuki.
If the carbs start leaking after the bike has been sitting for some time like over night or a few days, then suspect a leaking petcock.
If one carb starts leaking rather quickly, then suspect a sunken float. I had this happen to a T500 that was fine before putting it away for the winter — fuel leaked badly out of one carb when I tried to start it in the spring.
A bit more info would help us come up with useful advice.
If the carbs start leaking after the bike has been sitting for some time like over night or a few days, then suspect a leaking petcock.
If one carb starts leaking rather quickly, then suspect a sunken float. I had this happen to a T500 that was fine before putting it away for the winter — fuel leaked badly out of one carb when I tried to start it in the spring.
A bit more info would help us come up with useful advice.
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
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- Yeah Man, the Interstate
- Posts: 590
- Joined: Tue Mar 10, 2015 12:35 pm
- Country: WALES
- Suzuki 2-Strokes: suzuki gt 550j
- Location: Wales
Re: float level
How clean are the carbs ? If float needle valve has any debris in it it won't switch off fuel. Just checking that the Petcock is in on or reserve but not prime?
98 carb Blackbird and GT550j
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- Around the block
- Posts: 74
- Joined: Fri Sep 14, 2012 3:00 am
- Country: Australia
- Suzuki 2-Strokes: ts125, ts185, gt750k, gt750j
- Location: central west, New South Wales
Re: float level
I checked float level of each carby on bench with no problems. needle & seat holds. But fitted to bike they leak. Carbys seem to tilt forward when on bike. Maybe needs float level lower
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- Yeah Man, the Interstate
- Posts: 590
- Joined: Tue Mar 10, 2015 12:35 pm
- Country: WALES
- Suzuki 2-Strokes: suzuki gt 550j
- Location: Wales
Re: float level
Hi
The fuel level is critical to the running and performance of the bike and it has to be set at the stipulated level or the bike will either run too rich or worse too lean. Just want to confirm that the float level was measured from the carb body and not the gasket and with the carb tilted at 45 degrees and the tang on the float just touching the extended spring part of the float needle valve?
The fuel level is critical to the running and performance of the bike and it has to be set at the stipulated level or the bike will either run too rich or worse too lean. Just want to confirm that the float level was measured from the carb body and not the gasket and with the carb tilted at 45 degrees and the tang on the float just touching the extended spring part of the float needle valve?
98 carb Blackbird and GT550j
- jabcb
- Moto GP
- Posts: 4251
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: float level
You can confirm the actual fuel level by using a fuel level tool.
https://www.z1enterprises.com/fuel-leve ... uzuki.html
Check the fuel level with the carbs horizontal. This shows the correct level on a GT250 carb:
https://www.z1enterprises.com/fuel-leve ... uzuki.html
Check the fuel level with the carbs horizontal. This shows the correct level on a GT250 carb:
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
-
- Around the block
- Posts: 74
- Joined: Fri Sep 14, 2012 3:00 am
- Country: Australia
- Suzuki 2-Strokes: ts125, ts185, gt750k, gt750j
- Location: central west, New South Wales
Re: float level
Thanks jabcb ,have used fuel level tool and same as your photo on bench but i am thinking when on bike it may different
Also thanks GTandcbr ,have set float levels the same as you described. But maybe i am out on measuring,
See the carby tilting forward .
Also thanks GTandcbr ,have set float levels the same as you described. But maybe i am out on measuring,
See the carby tilting forward .
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- Yeah Man, the Interstate
- Posts: 590
- Joined: Tue Mar 10, 2015 12:35 pm
- Country: WALES
- Suzuki 2-Strokes: suzuki gt 550j
- Location: Wales
Re: float level
Another thing to consider is warped float bowl rims. Over time the alloy becomes slightly warped and therefore doesn't seal properly. This can be sorted by rubbing the bowl on a piece of fine emery paper laid on a pane of glass and gently sand it level.
May be worth a try?
May be worth a try?
98 carb Blackbird and GT550j
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- Expert racer
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- Country: England, UK
- Suzuki 2-Strokes: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
Re: float level
I seem to remember one guy on here recommends making your own viton rubber gaskets and finds that helps
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- Around the block
- Posts: 74
- Joined: Fri Sep 14, 2012 3:00 am
- Country: Australia
- Suzuki 2-Strokes: ts125, ts185, gt750k, gt750j
- Location: central west, New South Wales
Re: float level
Removed float bowls and checked for warping. And they were warped, sanded as GTandcbr suggested. a lot better but still weeping .May need to replace gaskets. Good news the motor started for the first time after rebuild and stayed running without starting a fire (no fuel running across floor of shed)
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- Yeah Man, the Interstate
- Posts: 590
- Joined: Tue Mar 10, 2015 12:35 pm
- Country: WALES
- Suzuki 2-Strokes: suzuki gt 550j
- Location: Wales
-
- Around the block
- Posts: 74
- Joined: Fri Sep 14, 2012 3:00 am
- Country: Australia
- Suzuki 2-Strokes: ts125, ts185, gt750k, gt750j
- Location: central west, New South Wales
Re: float level
Thanks GTandcbr ,I have ordered new OME Suzuki gaskets from my local dealer ,still available.
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- Around the block
- Posts: 74
- Joined: Fri Sep 14, 2012 3:00 am
- Country: Australia
- Suzuki 2-Strokes: ts125, ts185, gt750k, gt750j
- Location: central west, New South Wales
Re: float level
Fitted new suzuki gaskets and all good now.
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- Expert racer
- Posts: 1120
- Joined: Wed Jul 10, 2013 12:04 pm
- Country: England, UK
- Suzuki 2-Strokes: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
Re: float level
excellent. glad you got it sorted