Bonneville America Forums Forums Technical Forums General Tech keeps shuting done at speeds above 65

i need some help i have a 06 america 790cc that i knocked the last to baffles out of the exhust and had the dealer install the air bypass kit,rejetted,and dynoed. the problem iam having before and now is that every once in awhile the bike will act like some one shut the fuel off if i take her above 65mph and hold it there for awhile i then can pull over and let it set for about 4-5mins {it seems that if i play with the petcock it helps but not aways} if any one can help me i would love it before warmer weather gets here thanks so much DAN

I had the same problem (twice) with my '07 America 865cc. The first time it was the breather valve, which was getting stuck open and needed to be replaced. The second time was because of the EVAP system, which I disconnected. The problem has not come back so far...

Not a blocked or pinched vent hose is it

Try undoing or loosening the petrol cap, especially if you have the standard one on as they are not vented..

if the vent is the issue, just get one of those vented flatmount gas caps from Newspeedmaster.com

hidden fuel filter, i just went through the same thing last week

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For the past couple of weeks, my bike has been choking out on the highway, and generally running bad at high rpms. Not so much around town, but when I hammer it, she wants to sputter and cough. I had the carbs off several weeks ago to make some changes, which didn't work out, so the I put them back on and went for a ride. After about 90 miles, it started to act like it was dry, so I switched to reserve and made it to a gas station. Filled up and took the interstate home. Still acting like no fuel. Seems a little weird, since there had been no problems before this. So I adjusted the idle mix screws, thinking maybe that would fix it, since it was popping a lot. Rode out to my dealer, had him test ride it, of course no problems on the test ride. Before he rode it, he drained the bowls thinking maybe water in the fuel. So I head home, and just like before, after I hit 64-65 mph, it starts choking again. Now I'm just hoping it's not the CDI, because I can't afford a new one right now. I get home and decide to check the in line filter. Pull the carbs, off with the fuel line, there it is. I pull it out, and there is some chum and crud in it, nothing out of the ordinary for a 7 year old bike, except wait, there it is, what the?!?! A big piece of cotton or fur or a dandelion or whatever in the filter, so I get a small allen key to get it out, and before I can inspect it, it just blows away in the wind. I clean out the filter and put it on the shelf for later, connect everything back up and go for a ride. Flawless! It's been a few hundred miles since then (Thursday), and everything seems to be just fine. I'm relieved it wasn't the ignition! Screwed in the mix screw again, and all is well. I should have checked the filter first, but wasn't totally convinced that was the problem, especially since in all the times I had the carbs off, I don't remember seeing it there.

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from this thread
http://www.bonnevilleamerica.com/forums/...3961#Post377505

can you till me where the beather vale is located at thanks DAN

The valve is located on the down tube behind the carbs. It is a little plastic part clipped to the front of that tube. It is more likely the you may have a kink at the front tank mount if the tank has ever been off. Try cracking the gas cap and see if that solves the issue if it does then you have a breather problem. If it doesn't you have another issue.