<VV> 110 PG with rough idle and wanting to stall at stops

[Tony Underwood]

At 03:31 PM 9/20/2009, Stephen Upham wrote:
>I just tried the wire down the venturi suggestion.  When placed in
>the left carb it shuts the engine down.  When placed in the right
>carb engine continues to run.  No change in the performance.
>I then tried removing the idle screws and sprayed Gumout in the
>holes.  I reinstalled, gently seated them, and then backed out 1 1/2
>turns per the manual.  No change in the performance.
>I tried the hand over the carb, rev and release method.  The left
>side immediately dies when covered unless I rev first and then place
>my hand over the carb.  The right carb allowed placement of the hand
>and then reving.  After trying that three times on both sides... no
>change in the performance.
>I eyeballed the crossover tube where possible and felt for cracks in
>the rubber connections in the tubes where I couldn't and felt
>nothing.  Remember that it is attached to the carb with hose clamps.
>
>Next...




You now know which carb to work on.   ;)


The fact that capping the right carb and revving the engine which was 
then running on the left carb means the right carb has an issue.

Since the engine would run with the left carb capped after revving it 
first suggests the right carb's secondary metering system is working, 
otherwise the engine would have still quit when the left carb was 
capped and running (theoretically) only on the right carb regardless 
of whether the engine was already revving or not.


This suggests the right side carb's idle mixture and primary metering 
system is inop.   That's where you start...



When you shot carb cleaner into the mixture screw hole, did anything 
come out of the venturi cluster air bleed holes?    Also, when 
sighting down into the carb throat, did anything spray out of the 
primary transition slot?   You need to hold the throttle open to see 
it best.








By the way...   just on a lark:    Is the idle speed adjustment screw 
on the right side carb having any effect at all?   Not the mixture 
screw, the idle speed screw.   The right carb hasn't had something 
physically break or fall off in the throttle linkage and shut the 
carb off, has it...?    Been there done that once...




tony..