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Maybe check to see if the bail cable isn't bad. It may not have sufficient tension to disengage whatever kill system is on the mower.

Saw that the OP had another post about this problem and had the engine number listed. 463707-2238E1-02020115A flathead

Thanks for this. Can't believe I've never seen the channel. I can almost hear my wife saying "...another mower channel?" :p

I stupidly bought a $13 (amazon) compression tester that wouldn't work on anything with an ACR unless it was spun with a drill. I figured if I did it someone else may have too.

Mustie1 Although he's not strictly small engine, I've found Mustie1 very good at diagnosing. Problem is you can't tell by the video title what the issue is gonna be that's causing the problem.

Might need to spin the engine with a drill to deactivate the compression release to get a true reading. Is the head gasket good? Blown will cause loss of compression. Also if you whacked something recently the flywheel key may be slightly sheared causing a timing issue. If you are getting a...

So the problem might be the aftermarket carb. I would crack the nut on the fuel solenoid to see if gas dribbles out. You can then be sure fuel is making it to the bowl. Then check the float as bertrrr suggested.

So if your air vane is moving freely and so are your throttle plates, my guess is your spring might be shot or the governor linkage is damaged. With the mower buttoned back up, you can manually move the linkages to see if you get a running speed. Just leave the screw in the carb throat, auto...

Is your fuel filter one of those paper filters that amazon sells at 15 for 9 bucks? If it were me, I would have no obstruction between the fuel tank and carb and see what happens. It could be as simple as a crappy fuel filter.

The pros are gonna need your model type and code of your engine and the model # of your rider to really help. In the meantime, what happens if you delete the fuel filter? Can you replace it with a shut off valve to see how it runs then.

Also might want to check under the shroud to see if the air vane governor is moving as it should

I have the 3.5 horse version of this engine on my tiller. That knob is the throttle control. Here a pic of my linkage, hope it helps.

So if the fuel solenoid is faulty it could definitely be contributing to the problem. It could be stuck open, closed or somewhere in between. When mine went bad, I cut the tip off with some strong cutters and reinstalled without it connected. If you use anything besides cutters to remove the...

Are you sure the choke plate is totally closed and moves correctly. Maybe try blocking it manually to see if it helps. If the weather is really cold the oil grade could possibly be contributing to the problem. If its definately not the choke I'd guess its running too lean to start when cold...

You can always try connecting power directly to the starter, bypassing the wiring and solenoid. If it goes you know you have a bad connection somewhere. Also see how it cranks without a plug(s), no compression. It should crank at a good speed. If it doesn't may be a bad starter. Why was all...

Looks like Bertsmobile1 beat me to it :)

Also if it won't stay in neutral there may be a safety interlock killing your spark.

Before the pros arrive to give their advice I would remove the air filter and squirt some carb cleaner into the carb to see if you get a sputter. You could also give a little shot into the spark plug hole, bypassing the carb. If you get a sputter Its most likely a fuel issue. If you get...

Sealing that hole and buying a vented cap would be ideal. My problem is finding a vented cap that fits this tank. I'd hate to buy a new cap only to find its sealed also. If anyone needs to know, the cap I have currently is 594061 which has been superseded to 84004416 Also Rivets is correct...

Thanks for the replies and Ideas. @Rivets I'll definitely give a shop a try, but they are getting harder to find. Had three close up in the last 5 years or so. @sgkent that's a good idea. I have some black tygon line that may work. I just wonder if there's something in the end of that tip...

Thanks for the reply. So I guess this takes the place of a cap vent for emissions? I'm no engineer but it seems really dumb to place a thin plastic tube into an area that is frequently messed with. Would sealing this hole and using a vented cap be a solution? The used tanks on ebay are going...

Part number for the tank is 594112 superseded to 84004115 Mower is Husq 96145003500 Briggs engine 103M02-0070-F1 I'm wondering if this is a tank vent of some sort.

I just rescued a newer Briggs that was headed for scrap due to a carb issue. When I tipped the mower to change the oil, some gas escaped from the top of the tank where a little fitting?? has been snapped off. I've seen this type of tank before but never with the little fitting. It goes into the...

Finally got my hand on a blade and it did the trick. Thanks to all who replied.

Thanks for the replies folks. There is no blade installed so I'll try that next. Before I pull the sump and check the compression release as StarTech suggested, is there anything else that comes to mind? I truly appreciate the time taken to answer this post.

Hello all..longtime lurker first time poster. I have an old Briggs Quattro 4hp L-head that is ripping the recoil cord out of my hand. This mower had its blade come off at speed before it was stowed for some years. I expected a sheared flywheel key. Key Looks perfect. I checked to see if the...