fuel should never be coming out of the air filter. do you mean the pipe that goes from the engine to the air filter housing? if so thats the crankcase breather pipe and you shouldnt be getting fuel there either. if you have fuel coming out of the air filter housing then you carb is probably flooding and will need stripping and the needle vale and foat looking at
Likely either the engine is flooded or low compression.
A simple go no go compression test is remove spark plug and press a thumb or finger firmly over the plug hole and crank engine. It should forcibly push your finger and make a loud PFFfft sound. No or little sound equals insufficient compression.
If the push rod was not bent, there was no reason to replace. If it was bent then I question how you set proper valve lash with new pushrod as the typical cause for a bent rod is a displaced valve guide.
If compression is OK then likely it's simply flooding and you have a carb float/inlet needle issue. Crank engine, remove plug and if it's saturated with fuel then it's flooded and a flooded engine will not fire, even with starter fluid.
Question edited for clarity and spelling.
Question moved from Motorcycles category.
Please proof read before pressing 'Post Question'. Your 'Bolson' doesn't exist!
https://www.google.com/search?q=Bolsen+1.5HP+158cc+briggs+%26+stratton
Surging is usually caused by an air leak in the inlet manifold.
Remove and sharpen the blade. If the blade is sharp, it will slice though the grass with no resistance. Over time, the cutting edge gets blunted by stones, grass and soil. If that doesn't fix it, remove the carburetor, strip and clean all the jets. Make sure you count the turns and write down any pilot jet settings.
Check the fuel lines. My brother had one that wouldn't start because when the fuel line was forced on to the fitting, some rubber shaved off the inside of the tubing and blocked the fitting. Also inspect the fuel filter and fuel cutoff or check valves if these are present.
I haven't looked up your particular model, but some riding mowers have fuel cutoff interlock devices. Check those for proper operation.
BRIGGS & STRATTON ENGINES:
For temperatures above 40? F use an SAE30W oil. Using multigrade oil may increase oil consumption. Using SAE 30W oil below 40? F will result in hard starting and possible engine
bore damage. For temperatures below 40 ? F use
an SAE10W-30 or SAE5W-30 oil. Oil capacity for the 6 H.P. engine is approximately 5/8 quart (20 ounces; 0.6 liter).
Refer to Briggs & Stratton engine owner's manual for additional
information.
It's goose is cooked. or notsee long play below.I assumed that was done first,.or the blade engage lever is disengaged now and the engine pulley to blades is relaxed, the engine may have cracked the rod or crank shaft.
Rotate the engine in the direction it runs, since the stroke sequence is intake, compression, power, exhaust, the exhaust valve will open and close followed closely by the intake. After the intake opens and closes there will be a pause before the exhaust opens and closes again.
Remove spark plug Remove cover from engine that covers the flywheel Remove rockerarm cover or valve cover Find TDC (top dead center) by rotating the flywheel by hand and your finger over the spark plug hole as you rotate the flywheel you will feel pressure against you finger at some point then stop. This is the compression stroke it is called now find a long slim round piece of plastic or plastic ink pen to stick in the spark plug hole (If you are careful a slim screwdriver can be used ) and find the piston top, then slowly rotate flywheel again (cw) as the piston is moving up pushing the plastic up as you rotate the flywheel slowly. a max. piston up or tdc as you turn you will feel and then the piston starts to go the other way,at that transition this is tdc (piston is on top of stroke) leave it there,,both valves should be closed at that point. Have a feeler gauge and set the exhaust valve at a loose .002 and the intake a loose .004 be sure engine is cold when valves are adjusted Feeler gauge goes in between the rocker arm tip and valve stem top for each valve setting. Note the rocker adjustment at the push rod side of each valve by tightening and loosening to make adjustments,lock your adjustments in place and rotate flywheel a few times and recheck settings
