First Generation Ascots > Tech Section

Petcock fuel flow

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WTF304:
On the petcock, there are 3 ports. Fuel feed, a vacc source back to the carb, and i could be wrong but there is one used factory as just a breather or vent hose. Kinda figured the one on the carb would have to be blocked off, just curious if the fuel would leak out of the vent line or the vac feed from the carb to the diaphragm.

Only one way to know, I'd prefer to be able to manually control the fuel feed and many of my machines did.

J6G1Z:
The petcock will not leak out of the two other ports unless the diaphragm is bad. If I recall correctly, one port is the vacuum side & the other is a vent to atmosphere to allow the diaphragm to move back & forth.

J.

WTF304:
Cool thanks for the info, did it shorten up starting times for you? The electric start mechanism is not something i like to be cranking the piss out of. Parts to the system aren't as easy to find as they are to replace

J6G1Z:
I follow a starting routine. Usually when I'm riding home, I close the petcock a few blocks from home & run the carb dry before parking my bike. I store my bike on the center-stand.

So... When it comes time to start, I check the crankcase oil level first, then open the petcock & push the bike outside. Usually this is enough time for the carb bowl to fill. I then crank the throttle WFO about 4-5 times to operate the accelerator pump to prime the carb. This squirts a bunch of raw fuel into the carb. Now pull the choke to full & then hit the starter. The bike should fire right up as long as your battery is strong. The FT Ascot really needs a strong & well charged battery to prevent excessive cranking of the starter.

Good luck
J.

WTF304:
Routine is important, the way the linkage that work's the pump hardly even moves it though. I take the bowl off and manually work the accelerator pump gently to see how far it actually moves. I get a measurement by eye and then i bend the end of the linkage a bit so i get one good push from it. When the pump finally ends it's stroke the throttle valve is almost half open so i have about 1/2 to WOT that isn't working off the pump. Worked very well on my ice raced FT

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