Carb leaks after it's been sitting

General discussion about Street two-stroke Suzuki motorcycles.

Moderators: oldjapanesebikes, H2RICK, diamondj, Suzsmokeyallan

Post Reply
Premixer63
Still in the Driveway
Posts: 8
Joined: Sun Nov 20, 2016 6:57 am
Country: USA
Suzuki 2-Strokes: S32-2

Carb leaks after it's been sitting

Post by Premixer63 »

Hi all, hope your enjoying the great riding weather! My '66 Suzuki S32-2 has a problem - about 5 minutes after I shut off the bike (petcock still on) one of its carbs starts leaking. I'm assuming the float tab needs to be adjusted but want to eliminate another possibility - since there is no leakage while the bike is running, can I eliminate the float gasket as a cause?
User avatar
jabcb
Moto GP
Posts: 4240
Joined: Mon Dec 13, 2010 4:32 pm
Country: USA
Suzuki 2-Strokes: 69 T350 thru 75 GT750
Location: southwestern Pennsylvania

Re: Carb leaks after it's been sitting

Post by jabcb »

Does your bike have a manual or vacuum petcock?
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
Premixer63
Still in the Driveway
Posts: 8
Joined: Sun Nov 20, 2016 6:57 am
Country: USA
Suzuki 2-Strokes: S32-2

Re: Carb leaks after it's been sitting

Post by Premixer63 »

jabcb wrote:Does your bike have a manual or vacuum petcock?
Manual.
User avatar
jabcb
Moto GP
Posts: 4240
Joined: Mon Dec 13, 2010 4:32 pm
Country: USA
Suzuki 2-Strokes: 69 T350 thru 75 GT750
Location: southwestern Pennsylvania

Re: Carb leaks after it's been sitting

Post by jabcb »

The needle valves are intended to control flow when the motor is running. It is normal for them to leak a bit when the motor isn’t running. So you need to use the petcock off position.

But 5 minutes suggest something needs tended to.
The needle valves might not seal as good as they should because of crud from the gas tank.
Check the condition of the needle valves.
Check the condition of the floats. You won’t have the correct level if the floats are dented in or have been repaired.
And make sure the float is set correctly.
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
Post Reply