Also, don't forget to check your valves. If one of them is loose, that can
cause a loss of vacuum as well.
On Fri, Aug 13, 2010 at 12:13 PM, <corvallis@peoplepc.com> wrote:
> Once you rule out air leaks as described by others . . .
> Sync dual SU Volvo carbs (prior to 1970's) [SU's are SU's]
> 1. warm up engine
> 2. Screw up mixture nuts all the way and then down 2 turns.
>
> up = leaner, down = richer. (this is the nut at the bottom of the
> carb)
> 3. loosen up throttle shaft couplings
> 4. adjust idles so carb air intake is the same, engine running (use
> Unisync)
> 5. run adjuster nut down until smooth running; or up until rough running
> and then back down
> 6. adjust idles so they are the same(repeat back and forth steps 4 thru 6)
>
> Stall indicates other carb is too lean when you push up the piston
> pin at the side of the carb (so you'd turn down on its richness adjustment
> screw)
>
> 7. do a final idle check on both carbs using Unisync.
> 8. tighten nuts on throttle shafts
>
> If you need to avoid blocking holes on face of carb with Unisync base, cut
> off both ends of a can. I use and old STP Gas Treatment can (8 oz.) or a
> Hunt's Tomato Paste can (6 oz.) Rubber tape around the card end can prevent
> air leakage there if that appears to be a problem. . . . bill in oregon
> ----------------------------------------------------------------
> -----Original Message-----
> From: spridgets-bounces@autox.team.net
> [mailto:spridgets-bounces@autox.team.net] On Behalf Of
> ryan.kubanoff@comcast.net
> Sent: Friday, August 13, 2010 9:04 AM
> To: spridgets
> Subject: [Spridgets] Carb issues...
>
> so the car has been running really rough lately (enough that its shaking
> the
> heater core). basically I think since my jet went on my front carb and I
> replaced it with a new one and not the rear carb. I also noticed a serious
> hiss coming from the back carb. so this morning i replaced the jet on the
> back carb and tightened up the rear float bowl as it seemed to have rattled
> loose.
> I went to restart the car and its still running really rough and I noticed
> that the front piston does not move up on its own but the rear does. I also
> noticed that I can COMPLETELY cover the front carb with no affect to the
> engine but the same on the rear carb kills the engine.
>
> so since I am still mostly clueless. my guess is that my front carb is not
> working at all and I have been potentially running around on my rear
> cylinders only.
>
> So how do i diagnose and fix this since it is now undrivable?
> thanks
> ryan
> 74 Midget 1275
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--
DON JULIO 1942
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