You need to soak the carb in a good carb cleaner for a couple of hours then blow all passages out with compressed air, this should dislodge any junk.
SOURCE: 17 hp briggs hard to start and blows back through the breather
Hello rfrazierL
>>From your Description it Sounds like the Valves Require Adjusting.
>>The Following is a Basic File I made for Setting the Valve Clearances. Any Input is Appreciated.
>>**I Do Not Use the Setting Called for by the OEMs. I have Found that the Following Works Best.
>>Remove the Valve Cover (on the Dead Cylinder for Twin Cylinder Engines).
>>Check the Push Tubes and make Sure they are Not Bent.
>>Set the Cylinder you are Setting the Valves on to Top Dead Center on the Compression Stroke When Setting the Valve Clearance. Now Loosen the Valve Adjuster Lock and Using a Blade Style Feeler Gauge, Set the Intake Valve Clearance to .004in -.006in and the Exhaust to .006in - .008in. Loosen and Tighten the Rocker Arm and the Feeler Gauge is Placed Between the Rocker Arm and the Valve Top where the Rocker Arm Pushes on the Valve.
>>***BE SURE TO TIGHTEN THE ADJUSTER LOCK AFTER YOU HAVE THE PROPER VALVE CLEARANCE***
>>I have had Better Performance Out of the Mowers and Less Burnt Valves Using these Settings. Be Sure the Piston is at TDC on the Compression Stroke.**
>>If you Remove the Valve Cover and then Turn the Engine by Hand, you can Watch the Intake Valve Movement. When the Intake Valve Closes, the Piston will Just Starting the Compression/Power Stroke.
>>On Some Engines you can Us a Straightened Coat Hanger and Feel the Piston.
>>Be Careful and Don't Jam the Wire in the Cylinder. Usually the Piston will Push the Wire Out of the Spark Plug Hole with No Problems.
Respectfully
John
SOURCE: I have a Craftsman mower LT1000 riding mower 17
Need to pull tour carb bowl and clean out, make sure while you have off check you float and make sure it moves free,I hope this helps you and thanks,
SOURCE: Craftsman riding mower floods after a few seconds
FYI...just thought I'd give a little back...
had exactly the same mower/plow w/ same issue !
mine is an older L-head from pre-1998...used....
19.5hp 3 screw type diaphram fuel pump carb...
the pic's and how to assemble... I will send if,
you email me... Instructions do not come from
B&S when you buy there part # 694056... = 10$
carb rebuild kit...they want to sell the manual too !!!
sku# 0 24847 26246 9 ...shame on them !
they are selling manual # 27xxxx for 20$...
to tell you what to do ! ....%$#-THEM !!!
I made a pdf...with before and after pic's of
how to rebuild this carb...it's quite unique in fuel pump design and simplified governor operation...
...
running well this 19.5 twin - fan cooled...is like a 25HP !
the carb kit from B&S is generic...w/extra parts...
I have pic's of the actual ones used/needed for this
carb... Main jet is mis-labeled...it's a bowl vent !
There are no jet's to adjust on this carb...
only adjust is idle speed post the governor linkage !
also shown functioning in my .pdf...
hit my mail ..... driscoll_at_pzdi_"dot"_com
or visit www _ pzdi _ com
248-390-3541
SOURCE: 19 hp Murray garden tractor won't run
no sounds like your carb needs a real good babtising! good look!
SOURCE: I have a craftman 17 hp riding mower. it will
Remove the bottom bowl of the carberator and replace the needle-valve and float - cleaning this area as you do so. Sounds like the float has a hole in it or the needle valve in the carb is sticking. Use some fuel stabilizer prior to storing for winter next time, if not the old gas turns to shellac and makes things stick.
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