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Display Mesage #94279


Gas leak in vacuum line
Written by lcshepp on 6/20/2010 at 08:49 am

Hi Coasters,

Douglas Van Bossuyt and myself have been trying to help Jim Day solve a
mystery with his '96 PC. Jim lives in Hawaii and the local dealer won't
work on the bike because it is over 10 years old...

He has a small gas leak and the associated smell. I thought it would be
the petcock but Jim tightened the screws (which were a little loose) and
the smell persisted.

I pulled some plastic off my '96 so we could compare notes and, with
Douglas' help, we have determined the following:

There is a little 4-way connector below and to the rear of the petcock.
2 of the lines coming from it are vacuum lines and 1 of those goes to
each carburetor. We aren't sure where the 3rd line goes. The fourth
connector is open on 49-state bikes. On CA bikes, an emissions hose is
attached to this fourth connector. It is the 'Evaporative Emission
Carburetor Air Vent Control".

If Jim puts his finger over the opening from that connector, his engine
speeds up. On mine the engine speed changes when I cover it. In both
cases, I suspect the level of vacuum in the motor is being affected by
closing off this connector.

Jim is getting a small amount of gas out of this connector; none comes
out on mine. What we are trying to figure out is where the gas is
coming from. It's most likely from the carbs but how and why are not
clear to us.

Has anyone else experienced this and what did you do to cure it?

Thanks for any info on this.

Leland

--
Leland Sheppard
Placerville, California, USA

...Life is good on the Pacific Coast...

'94 Pacific Coast, "Black Beauty", 211,500 miles
'89 Pacific Coast, "Shadow Dancer", 118,475 miles
'90 Pacific Coast, "Red Baron", 106,100 miles
'96 Pacific Coast/SuperSport sidecar, "Handsome Hannigan", 31,150 miles
'02 Ural Patrol, "Boris Blueanov", 15,250 kilometers
'89 GB500, "Little Bugger", 13,692 miles
'02 GL1800, "Copper", 55,850, '07 Aspen Classic, "Copper's Camper", 1,545 miles
iPCRC #72; IBA #10582; AMA #481368

Mother of all PC800 Web Site Lists: http://www.pc800links.net

Message Thread for message #94279