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Display Mesage #99711


Carb Vacuum Pistons
Written by spacetiger_j... on 1/1/2011 at 05:13 pm


Phil,

I think thats normal. They mate up with the housing to keep them from twisting.

BTW, I am picking up a few other items and may have the naked PC (Mr Hyde)
running soon. As part of the exhaust build, I'm mounting up some oxygen sensors
so I can dial in the carbs so I'm not rich/lean. If this matches up with your
carb rebuild, you can come over and mount your carbs up and we can set them up
to run the most efficient. Perhaps by Jan end - I'm slow these days.

Jerry

Jerry

--- In ipcrc@yahoogroups.com, "Phillip Boyd" <phillip.g.boyd@...> wrote:
>
> Okay, I should probably know this because I have already taken apart and
rebuilt two sets of PC800 carbs already, but are there supposed to be small
slits in the vacuum piston rubbers? I don't recall seeing them in any of the
previous sets, but the set I just got from eBay has them in both the number 1
and number 2 carbs. They're very small - maybe 1/4 inch long and you can only
see them if you hold the carbs up to the light and flex the rubber slightly. My
curiosity is up because they seem to be very uniformly placed around the bottom
of the rubber where it joins with the piston.
>
> The seller claims he rode the bike and the carbs worked great. He's offered
to refund my money if I pay to send the carbs back, but at this point I would be
out about $20 for shipping to recover $60 - plus the time it will take me to put
the carbs back together. These are the dirtiest carbs I have ever seen in my
life.
>
> Thanks
> Phil
>

Message Thread for message #99711

pgboyd
1/1/2011, 02:40 am
Carb Vacuum Pistons
Okay, I should probably know this because I have already taken apart and rebuilt two sets of PC800 carbs already, but are there supposed to be small slits in the vacuum piston rubbers? I don't recall seeing them in any of the previous sets, b

    dndgentili
    1/1/2011, 01:22 pm
    Carb Vacuum Pistons
    No, sorry Phil, those rubbers are NOT supposed to have slits in them. But at about $90 per carb X 2, it might be worth shipping them back and cutting your losses. Sorry. It's real disappointing that these seem to fail so often. I don't think

      pgboyd
      1/1/2011, 03:02 pm
      Carb Vacuum Pistons
      Dan - that's what I thought, but I was surprised to find both of them had the same type of failure in them. I've heard of people using Gorilla Glue to fix them too, but I don't know that I would go that route. These were a spare pair that

      akienm
      1/5/2011, 07:29 pm
      Carb Vacuum Pistons
      OK, this reminds me of a story, this is unrelated to the PC800, or even motorcycles, but does involve a carb... And an inspired bit of McGyverism. My first car was a Chevy Vega, I bought it from my folks. After I'd had it for about 2 years, t

        ohpossum
        1/6/2011, 05:49 pm
        Carb Vacuum Pistons
        > On Sat, Jan 1, 2011 at 5:22 AM, Dan G <dndgentili@...> wrote: > > > > > > > No, sorry Phil, those rubbers are NOT supposed to have slits in them. But > > at about $90 per carb X 2, it might be w

    spacetiger_j...
    1/1/2011, 05:13 pm
    Carb Vacuum Pistons
    Phil, I think thats normal. They mate up with the housing to keep them from twisting. BTW, I am picking up a few other items and may have the naked PC (Mr Hyde) running soon. As part of the exhaust build, I'm mounting up some oxyg

    wes.steinbrecker
    11/10/2015, 09:18 pm
    Re: Carb Vacuum Pistons
    have used liquid electric tape.....don't have a time period to pass on