74 750SFII Carb/fuel Issue

[mtnduc]

Bike starts and idles fine, first 2-3 miles is fine.
Then idle drops off, rolling on the throttle causes bogging, no fuel type sensation.
If you shut if off and restart it idles fine but won't accept any throttle.  If you let it sit for 20mins or so it will repeat the good for 2-3 miles sequence and then stall.

Tried cracking gas cap to see if was a vaccum issue, no change.
Rode it home with the choke on one carb open and it ran like crap but I got home.

Carbs rebuilt appox 25 miles ago.
Running velocity stacks and no filters.  Only driven on clean paved roads and in dry weather..
Pulled one bowl and it was clean.
Drained the tank and the in-tank filters were clean and minimal crud came out.  Looked like flaked off paint from around the gas cap.

Any suggestions?

I'm guessing a complete carbendectomy is in order.

Thanks.

Brian

 

[Terry Dymond]

Fuel starvation;getting a couple of miles on the fuel in the bowls, stopping, bowls refill and away you go to repeat the process. (just a possibilty, I'm not a mechanic )

Terry

 

[Haggis]

Possibly a very slow fuel flow rate. Can you take the float bowls off and turn the fuel on (and catching the fuel obviously)? It should flow out pretty quick past the float valves. Paul.

 

[Ventodue]

Carbs rebuilt appox 25 miles ago.

And which should be your first 'Port of Call', Brian  .  Did you take the floats off?  Are you sure they aren't getting caught up when you remount the float bowls, a not-uncommon 'problem'?  Try tapping the bowls lightly before fully tightening the retaining nut ...

Ciao

Craig

 

[mtnduc]

Thanks Haggis & Craig I will try those solutions one night this week.

Sorry for posting this on the wrong forum.