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I swapped the breather and the gasket and it runs fine. Who knows.

Sprayed carb cleaner everywhere I could think to with zero change. Around the carb mount, around the breather, and around the breather tube. The only place I didn't spray was the head gasket. I'm going to replace the exhaust gasket (needs it) and the breather assembly/gasket. Maybe it's...

Took the boat out today and it ran, but I had to play throttle with the choke. I don't have an intake manifold. Carb bolts directly to the cylinder head. Could I have a bad head gasket? Fuel pump is newer, so I doubt that's the issue. I could have gotten a bad one, but it runs wide open with the...

Nope. Exhaust is on the side. Briggs managed to bolt a foot to the bottom of a vertical shaft 5hp motor. I can get in real shallow water. I don't even know where to begin to check for leaks. Surely can't do it while the motor is running.

Found a carb. It doesnt have an idle mix adjustment and doesnt have an idle speed screw. Seems to be from a later model. Installed it anyway and now it runs on choke only. As soon as you turn it off choke, it dies. Classic clogged carb. Except this one is spotless. No welch plugs to pull and...

I've done that a few times with other major mower parts, but carbs have usually been either superseded or in good supply. Never thought they'd have an old briggs outboard carb. I'll call around tomorrow. Thanks for that.

Normally, yes. I would have at this point. Part is discontinued and the one on ebay "didn't idle right." My next step is to dump it in an ultrasonic cleaner. If that doesn't work I'm going to look around for a carb body that's pretty close enough to the same and swap all the linkages over. Like...

On a 27HP, shouldn't it be keyed on/off? I'm not even sure any type of rocker switch will work.

I'm pretty sure that switch isn't rated for the amount of volts running through a coil. Voltage is likely jumping the internals of the switch.

People bubba-ing things, running straight gasoline in 2-strokes, and pisspoor engineering/design drove me nuts. Put me through college though.

Not fouled enough to not start when I spray fuel down the carb. :ROFLMAO:

Why would it start 4 days ago and not now though?

90psi after 4 pulls. not great. I can spray fuel in the carb and it runs.

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I can get on board with the one in the bowl because that one hasn't been on since I've owned it and it ran fine. The one on the side is the one I'm worried about.

It's sitting in another bowl of carb cleaner. I put everything back correctly. Still not getting fuel through the carb. The only thing it could be is my welch plug install and I have no idea how to tell if I did that right. I put it in and smashed the center out toward the edges until it was...

Wouldn't say I'm a super tech, but I did work on the 2 stroke side at a corporate shop for a couple years that did all of the Home Depot lawn equipment repairs.

Yep. Fuel getting to it, just not through it.

I've got a Toro 22" electric start personal pace recycler, etc. all the things... and it has the same behavior. Initial startup after sitting a few days takes a min for the starter and several pulls. I always figured it was because there's no way to manually prime it.

Carb is completely clean and idle mixture screw is unbroken. Removed the welch plug in the side and made sure all passages were clear. Reinstalled the two new welch plugs and put it all back together. Zero fuel getting through the carb now. I've done something wrong. Maybe I didn't seal the...

I never thought to check this. I'll have a look tonight.

I *might* have figured that out when I got to tearing it all down.:LOL: Glad I went back and double checked the valves.

Updating the thread... Readjusted the valves because one of my adjustments came loose. Exhaust valve was 0.008" instead of 0.003"-0.005". Also replaced the starter with a new Kohler brand higher torque. Found rubber bits in the bottom of the tank that was causing the fuel issue. Works as good...

Never noticed a welch plug in the bottom. Either it's never been there (unlikely) or it was removed by a previous owner. It's ran fine for me many seasons without it, but I guess I'll be putting one of those in this week. Might as well pull the other one and replace it too. It's sitting in a...

That's a good point. For as much as I do this, I should probably invest in an ultrasonic cleaner.

Checked that also and it's good. All gaskets are in the same order and orientation that they have always been.

I thought so too, but I'm able to spray carb cleaner through every hole and get fluid out of the other end. Do you think that there could be some buildup behind some of the plugs that are one way only?

There's only the idle mixture screw and throttle valve screw.

Yep. Clean as can be.

I've got a Briggs 5HP outboard that I can't get the idle mix adjustment screw to the right position. Looking for some tips to help get it set right. I pulled the whole thing apart and cleaned it well. Put the idle mix screw back in and turned it the same six turns it took to bottom it out when I...

For anyone interested, don't try to use the Gunk brand carb cleaner to start engines. It is not a good substitute for fuel mixture. Sprayed a fuel mix in the carb and it fired right up.

110 PSI on the compression test. I am now completely stumped.

New spark plug and gapped to 0.030". Confirmed I have spark. When I spray a little carb cleaner in the carb it doesn't hit. No fire at all. I pulled the flywheel and checked to make sure the key wasn't sheared and it was not. I'm guessing that I'm not going to have compression. Anybody else...

Thanks! Pretty involved process to get to that little guy on the cam. Do those fail often? I'm going to recheck valves and look for guide issues. Can the springs be removed with the head still on the engine?

Two issues: Kohler SV720S is a pain to start. Won't turn over past the compression stroke. The compression release is messed up somehow. Valves are adjusted correctly, so I'm guessing now it's valve guides. Saw a video on how to tap those back in place and might give that a try this week. I'd...