86 vfr750f carb problem

Help. I have an intermittent problem with the right front carb flooding when the bike sits or 8-24 hours. The thing starts to leak gas, then when I take it all apart, look down the barrel fuel is at the top of the vac piston in the carb. I started with what I thought were the bowls leaking and rebuilt all carbs. Was fine for a day or two, then noticed gas leaking out of one of the vac lines connected to the vac manifold, it was bad. took all the carbs off again, replaced all lines and o rings just in case. when i took it apart, saw the intake port was full, to the top with gas, thought maybe it was the gas line might have been spilling through the barrel so just assumed, a big assumed that was it. put carbs together again, sat them on a box, connected the fuel tank, turned tank on to fill the carbs, left it on to test for leaks. Dry as a bone.
Back on the bike, two days later, small puddle under bike, crap. Took tank off, air cleaner, looked down the same carb, right front. Flooded to the brim. So last night, took everything off again, decided to put old float seat and needle back in, left fuel on all night, no leak. but has done this before.


Finally my question. shouldn't, with the fuel turned on, the carbs stop the flow of fuel as long as the floats are working right? And, what is this diaphram fuel cut-off I keep hearing about but do not see on the bike. the fuel line goes from tank turn-off valve, to electric pump, to carbs.

If I have replaced the float seat and needle, how could it still be leaking-flooding? Is it possible on the first new seat, I didn't tighten them enough and the fuel was flowing around the seat and metal gasket?

Any ideas greatly appreciated. at least I am an expert on removing the carbs..

Jerryjerrypcman@hotmail.com

jerrypcman@hotmail.com

 

I know this is pretty obvious, but how are the floats? Is it possible that the float is filling with enough fuel to allow for the leaking/flooding. Thats all I got. Good luck

 

Reply

Thanks bud. Thought of that too. Guess what, got home last night after leaving fule on all day, And crap, had a leak again. Good news, it was at a different location, at the "T", took the tank off, looked down the barrel, NO FUEL FILLING IT UP> THANKYOU GOD>> tighten up the line at the "T", no leaks.

SO, EITHER ONE OF TWO THINGS:
1. THE NEW SEAT AND NEEDLE WERE BAD
2. OR I DIDN'T TIGHTEN THEM ENOUGH.

EITHER WAY BY INSTALLING THE OLD SEAT, IT IS FIXED.

I LOVE THIS BIKE. BOUGHT a vfr700 new in 1883, best bike I ever owned and have missed the first gen of interceptors since. Getting old, and weigh a bit more then back then, but how many 47 yr olds, at 250 lbs will ya see zooming a long on a VFR750F?

Yes, my profession is a pilot.. Go figure..

Anyone got any spare body armor, if I fall now, I will bethe one missing parts.

Keck, it even hurts to sleep. Guess I know how that guy in the Worlds Fastest Indian must have felt..

Thanks
Jerry in Dallas.

 

I want to know more about tightening up the "T" connection. This sounds a lot like the trouble I'm having.

 

a vfr700 new in 1883, best bike I ever owned

Did the 1883 model come w/ rubber clad steel wheels or just steel:laugh:
sorry I just had to:tongue:

Glad to hear you got your problem figured out!!

 

The best thing to do, is replace all the fuel lines if you suspect a leak. But in the case of the "T", I had a leak but couldn't find it until I moved the fuel lines around and saw a small leak at the "T", thought I had tightened it up good enough, but didn't. Instead of using the wire clamps, i used safty wire and a safty wire tool. THIS BY FAR IS ONE OF THE BEST INVESTMENTS YOU CAN MAKE. I learned this trick from airplanes. Most connections on small planes, experimental, use the safety wire type system to tighten the fuel lines. Also, have seen where the "t" also gets a small crack in it and leaks.

 

Appreciate the reply Jerry. I see you are talking about the clamping bands on the fuel lines. My lines looked high and dry when I pulled the tank, but you never know. I am borrowing an aux. fuel cell from a friend and should be able to pinpoint the trouble better by running the bike without the tank in the way. Thanks!