Carbs flooding out from excess tank pressure??

[D-Roc]

Do a search. It's been discussed enough. The oem tank will vent out after certain psi. Of course Yamaha engineers thought of this. They vented it up the pole. Not the engine bay. What are you guys new?


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[Big Kahuna]

Do a search. It's been discussed enough. The oem tank will vent out after certain psi. Of course Yamaha engineers thought of this. They vented it up the pole. Not the engine bay. What are you guys new?


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Who still has a vent tube going up their pole?

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[D-Roc]

Haha or who uses those pesky fuel shut off valves that keep the fuel from getting to the carbs in the first place. I just checked mine and it pops at about 5-6 psi


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[tomski]

Who still has a vent tube going up their pole?

IJSBA World Finals Tech requires fuel vent outside of bilge.

 

[Big Kahuna]

IJSBA World Finals Tech requires fuel vent outside of bilge.

I don't race or compete any longer. Not up on their current non current rules!

 

[Justinlowe948]

Oem vent does have a secondary pop off for over pressue so do aftermarket vents. Here Is the thing everyone has over looked oem is pop open at +7psi in tank and aftermarket seem to pop open around 10 or 12psi. Done believe me use a pop off testing gauge same as the pop off gauge you would use to test pop off pressure on the carb. Test the vent backwards. Colored fuel line does not create good seal and allows access pressure to pass by and not flood out motor. If you can't find a solution to the problem create a solution which would be putting in a shut off valve and leaving the vent open or cap loose