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Do you have the line that connects one carb fuel line to the other?
Make sure to leave the throttle intake throats in place to help the flow.I went the route on my V7 Sport running without the intake throats ran like xxxxx to much of a sharp transition without the throats TOMB
Have you tried just leaving it as it was and then doing a series of chops to see what, if anything, needs changing. The V series needles are very coarse. I always found they were best left alone.Pete
The bike didn't have a crossover, one petcock to each carb.. I would say both petcocks should be open for heavy throttle use
Hard to believe that two main jets could flow more fuel than a petcock can supply. If I take the fuel line off and open the petcock, it will empty the tank in about 4 minutes.You couldn't run an SP out of gas in four minutes of any kind of running ..... Lannis
This is more common that you think....Petcocks have fine screen that can become restricted...And you have to check fuel flow into the bowl to absolutely eliminate any suspicion... And for fuel to flow out, air need to flow into the tank...check the cap vent..loosen the cap as a test...
It's a bit more complicated that what you say. Amal concentrics standard needle jets flow just barely enough fuel to feed 30 HP per carburetor. Most of us racing that use Amals have the "two stroke" high flow bowls. The complication is to function properly the carb float bowl needs to remain nearly full. When testing the float is down all the way, empty bowl .. But in reality the flow must be sufficient when the float needle and jet are maybe 20 percent open... And just letting fuel spill out says what? Did you catch it in an measuring cup and time the flow for 30 seconds?
'Ang on a mo ... If you're saying that the limiter is the 20% open (and I'm sure you measured that against 100%-open flow for 30 seconds to come up with 20% ;) ) float valve, then how is opening two petcocks going to help that? You could open 20 petcocks, and if the "almost full" carb bowl fuel level is holding the float almost closed, it's not going to help get gas into the jet ......Wow, it IS complicated ....Lannis
Found the problem guys. Thanks for all the suggestions. Normally I do all my own maintenance. but the last little trip I took, I had the bike serviced at a small shop somewhere in the middle of nowhere. Nothing much, just an oil and filter. It seemed like a nice little independent shop specializing in eurobikes. The guy suggested changing the plugs, since I had not changed them in about 20,000 MI. I said sure. Never thought any thing more about it. That was the last time I rode the goose before modifying the air cleaner situation. When I pulled the plugs to do jetting runs, I removed B9ES's. Screwing BP6ES plugs ( the proper plug) back in it made all the difference in the world.
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