Carb adjustment Idlle and speed
It appears you have a B&S Vanguard series engine on your Genset.
Briggs & Stratton 9 HP Vanguard OHV Horizontal Engine, Model# 185432-0242-E1
MAX RPM's - 3600
hoping you first got all the contaminated sugar & gas mixtureout of
the Genset's gas tank, fuel lines (replaced the fuel filter aswell),
and the engine's Carb before running it. Hopefully you DID NOTrun the
engine even 1 second with that contaminated sugar gas - elsewise the
damage may already have been done to the engine & the OIL!Did you
change the engine OIL as well? Hope so! Did you try run it thatway with
or without the air/fuel Adjustment Screws set properly? If so- we can
only hope for the best here.
It's hard to
say if any internal damage wasdone unless the Carb first is fully
broken down, thoroughly cleanedout, and then checked forproper Float
setting, then re-assembled, and then adjusting theFuel/Air Adjustment
If all looks good with the Carb Bowl then you will next need to check the air/fuel mixture Adjustment Screw(s).
missing plastic top off the Idle AdjustScrew head can either be
replaced by something closely matching it byusing Super-glue or else
5-minute Epoxy, or else can be replaced with acrimped on slotted metal
cap. If you have a Dremel Tool with a diamondcut wheel you can just cut
a slot in the top of the Idle Adjust Screwhead for use with a slotted
screwdriver. Hopefully you are handy!
On your B&S Vanguard engine there is probably only 1 air/fuelmixture
Adjustment Screw - as from the Carb parts diagram that you canfind by
following the directions further below for reference. If youhave any
missing parts from the Genset sabotage then those might beordered from
that B&S parts list there as well.
Usually there are 2 Air/Idle Adjustment Screws side by side, but yours looks to only have 1. (See diagram at that B&S site)
If there are 2 needle valves on your Carb then turn both of them in CW just until they are fully closed or seated.
Do not force them or you may damage them.
If you have 2 adjustment screws do the following below - otherwise just set the IDLE Adjustment Needle Valve Screw accordingly.
the High Speed needle valve adjustment screw 1-1/2 turns CCW, andthe
Idle Speed needle valve adjustment screw 1 turn CCW. Normally youcould
open both up the same 1-1/2 turns CCW without any harm. Either way is fine.
This will give you the initial adjustment starting point so the enginewill start and warm up so you can do the final adjustment.
You should make sure that the air cleaner is on before you make any adjustments to the Carb.
To make the final adjustments you will need to move the governor (throttle) speed lever to the IDLE position.
the Idle SPEED adjusting screw (and NOT the Idle Adjustment NeedleValve
Screw) to get approx 1750 RPM - if you have a TACH all the better(you
have to hold the throttle lever against the screw while doingthis).
the Idle Needle Valve in CW just until the RPMs slow or the
enginestarts to cut out. This is a lean mixture btw. Then turn it out
CCWjust past where it will idle smoothly. It will run unevenly, but
thatis OK. Now turn it back in CW so that it's just halfway between the
twopoints. Then release the throttle lever.
Then do the same
with the High Speed Needle Valve Adjustment Screw withthe governor
(throttle) set to the FAST position. You do not have tohold the
throttle while doing the high speed valve. The engine shouldrun
smoothly, and also accelerate smoothly from Idle to Fast withoutany
hesitation or stumbling. If not - readjust as needed to get aslightly
The Genset AC Output Voltage is all factory
preset and pre-determinedby the engine MAX RPM, and also by the LOAD
you are running on thegenerator head. Use to a good DVM to double check
the output AC voltageaccording to your Operator's Manual, unless your
Genset has its ownanalog AC panel meter.
do post me a reply as to fixing your problem here, and the resolveto it
by following my recommendations above. Also please rate
mytroubleshooting fix as well.
Here is the B&S site info -
You can view a breakdown IPL of this engine at this site:
Just mouse click on the Shop Online Parts Look Up icon.
mouse click select the 2nd Folder grouping for (100000 - 19Z999)>
Then click on Folder (185400 to 185499) > Then click
on(185432-0242-E1) > Then click on Carburetor from the right hand
sideOptions > Then you have the Carb diagram with parts list. Use
theIcons in the upper right diagram to Enlarge or Shrink the Carb
This Carb may have a Float Needle and O-Ring Seat or may have just the Float Needle with a Black Rubber Tip and NO O-Ring Seat.
the Float Needle is all metal, then there is a flat O-ring seat inthe
inlet port that the needle seats against. If the float needle isthe
long needle type with the Black Rubber Tip, then there is NO O-ringseat
and the Float Needle seats right against the Carb housing.
Keep me posted and I'll follow up as well.
Aug 29, 2008 |
Coleman Electrical Supplies