Nice askii sketch btw. That's called a double lip o-ring. In the
hydraulics world it's the best but can be fussy to get to lay in the
grove properly. You MUST make sure it doesn't get rolled or twisted
on install. Don't use any sealant But a light smear of oil (110% no
dust or grit) can sometimes help it seal for startup. On fussy
sunstrand pumps I've used a very light smear of white lith grease but
carbs don't work at 2500psi so you should be ok.
At 08:02 AM 2/21/2012, you wrote:
Hi Bob,
Just to clarify, this is what a cross-section of my gasket looks like.
The upper part is more 'rounded' of course and fit the carb's groove
perfectly while the bottom part has a groove inside that runs around
the entire gasket's shape.
Richie
Bowl Side
________
/ \
| ______ |
|_| |_|
Body Side
On Feb 20, 6:26 pm, [email protected] wrote:
> I just looked at a spare carb and was reminded that the gasket is a molded
> o-ring that matches the shape of the groove in the bowl. The o-ring looked
> to be round(cross section).
>
> On Mon, Feb 20, 2012 at 1:23 PM, 85_NH650 <[email protected]> wrote:
> > Hi Guys,
>
> > I finally decided to take the plunge and clean my carbs myself. I have
> > an 85 NH 650 that had terrible recurring issues with hesitation/
> > choking/stalling at low speeds while performing fine at higher speed.
> > I had the jets cleaned a couple of times but the problems came back
> > within days. This started around the time ethanol was introduced.
>
> > I'm still in the process of cleaning the carbs, but I'd like to know:
> > 1). which side of the gasket faces the float bowl (bottom part of
> > carb): the rounded side or the 'grooved/flat side?
> > 2). Do I need to use any kind of sealer/compound or RTV (?) type stuff
> > on the gaskets before installing? Or anything else to 'treat' the
> > gaskets before installation?
>
> > It looks like whoever worked on the carbs before used some type of
> > gasket sealing stuff and I had to soak/clean up a mess of old and
> > newer material that had deteriorated and clumped into the carbs and is
> > probably effecting the low jets. We shall see.
>
> > I'd appreciate any help/advice you can give me as this is the first
> > time I tackle this task to cut down on the cost of having someone else
> > do it for me.
>
> > Thanks,
>
> > Richie
Pat Patterson
Abbotsford, BC, Canada
VA7PDP
2001 PT Cruiser
83 450 Honda Nighthawk
78 F350 460/C6 on propane
71 Bronco 302/C4/D20 D44/9" {o===o}
"Just add Lightness-"
Colin Chapman. (1928 - 1982)
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