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Display Mesage #99799


Carb Vacuum Pistons
Written by akienm on 1/5/2011 at 07:29 pm

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, the performance became very poor. It baffled me for some
time, finally with the help of a trusty propane torch (not lit) I found that
there was air getting into the venturi through the lower butterfly valve,
around the bar that it pivoted on. And I had zero cash to replace the carb
with. Crap. Finally, I took the carb off, took it apart, removed that rod,
and wrapped it in one layer of newspaper coated on both sides with high temp
brake grease. Put it all back together, problem solved. Got 120,000 miles
out of that fix.

--

Akien MacIain
Non-judgement day is near!


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 worth shipping them back and cutting
> your losses.
> Sorry. It's real disappointing that these seem to fail so often. I don't
> think I ever had this problem on other bikes, but I've worked on several PCs
> and they almost all needed replaced.
> On another note, I was working on a fellow's 1200 Goldwing and he didn't
> want to spend the money so we used rubber cement on them and they seem to
> work fine for the couple of years he owned the bike. Another case of, "Ya
> pays yer money and takes yer chances", I guess.
> VA Dan
> '95 PC "Darkness"
>

Message Thread for message #99799

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