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Discussion Starter #1
Hey guys,

So for a while now (about 1 year) i have what seems like the POOGS syndrome.
Whenever my fuel tank is at or below 50% and go beyond 65/70 m/h (100-110 km/h) its shocking and wont go faster even with full throttle. It wasnt that much of an issue since there are lots of gas stations here. it was just a matter of refueling twice as much. Untill a month ago it started (sometimes) doing it with almost a full tank. I tried driving with the gas cap open but that doesnt seem to work. Is there any other sollution for this problem? Besides cleaning the cap to solve this? Im having a long trip ahead in about 2 weeks and it would be a bummer if i cant keep up with my mates.
 

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Discussion Starter #3
There's a carb vent hose that can cause performance issues when wind blows into it. If this only happens at high speeds but not high RPMs at low speeds), then that is a likely culprit. https://www.vn750.com/forum/22-carbs-fuel-system/3777-carb-vent-hose.html

Could be gunk in the petcock, or in the float chamber of the carb?
Do you mean the 2 tubes with the T-split coming from the carb? my bike doesnt have those tubes connected. And i recently cleaned the petcock. It's really weard. I even removed the vacuum seal from the petcock to make sure the carbs got enough fuel. but it still not working. (reinstalled the vacuum seal again)
 

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Yeah, those tubes. Turbulent air, much less than direct wind, is enough to mess with the carbs, so try attaching those and tucking the ends in calm air.

Sinse you went as far as removing the vacuum seal, I'm guessing you checked that fuel flows freely out of the gas lines when they're disconnected at the carbs?
 

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If it still has a problem with the cap open, it is not a tank venting problem. Those carb vent hoses need to be in place. However, if it only happens when the tank is half full, that is not likely the cause either. Since the quantity of gas in the tank is what makes the difference, it almost has to be in the petcock assembly. It does not go on reserve till well below 50%, so the main strainer on the petcock could be partly plugged up, letting gas through to a certain level, till it reached the level on the filter where it is plugged up. I would completely remove the petcock and take a good look at it.
 

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Discussion Starter #6
If it still has a problem with the cap open, it is not a tank venting problem. Those carb vent hoses need to be in place. However, if it only happens when the tank is half full, that is not likely the cause either. Since the quantity of gas in the tank is what makes the difference, it almost has to be in the petcock assembly. It does not go on reserve till well below 50%, so the main strainer on the petcock could be partly plugged up, letting gas through to a certain level, till it reached the level on the filter where it is plugged up. I would completely remove the petcock and take a good look at it.
It seems it is also doing it now when the tank is full. and its only sometimes. which is really anoying. Would plugging in the carb tubes fix something like this?
 

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Plugging the carb vent tubes, or having them exposed to wind, will make it bog out.
 
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