B&S 303777 wont run after new rings

[wywy]

I just checked it and it has a little bit of play mostly in and out though, doesn't seem horrible though but I think I will just get a new carb that is the only variable I can think that it might be

 

[wywy]

Alright well I found a new carb after awhile of searching and it's coming this Friday so a lil long wait I will check back in when I get it

 

[Wikkyfolt]

Make sure your valves are set. I never read this through that hard, but anything not starting is usually valves, which is sometimes overlooked

 

[Gord Baker]

Hello everyone first time here, I have an old snapper mower with a b&s 303777, I did the rings on it and I cannot get it to run right, a little recap first though, the cylinder that runs the fuel pump was down to about 10 psi, 2nd was around 30, so I disassembled and got new rings for it, also lapped the valves, then it seemed to be seized apparently so I left it in my garage for about 2 weeks because I went on vacation to my grandparents house, when I got back the engine rotated fine so I got a new starter and it ran but very poorly, after about an hour of running I saw that the exhaust pipe midway down was glowing red hot, so I shut it down and let it cool and then I was just busy for a very long time so I never did anything with it, I started it up again for some more diag about 3 weeks later and noticed that the choke seemed to be controlling the rpm, and also about 30 seconds of running was making the exhaust pipe smoke, it again sat for about 2 weeks, I came out a couple days ago and it does the same thing but now it is very difficult to even get running, when I turn it over it fires for about a second then I can see the governor slams the throttle plate closed and then the engine dies, I have made a few attempts and got it to run but still the rpm is controlled mostly by the choke, exhaust also smokes in about 10 or 15 seconds, I did take the govenor system off and throttle system off more times then I can count and tried putting springs in different locations but nothing really fit so it's all back together I'm what I remember is the correct way I'm more of just at a loss of what's causing this, carburetor was dirty but I cleaned it out and stuff but the carb was never an issue to begin with, I have ran it off starter fluid for a lil bit but I still needed the choke to be almost completely blocking air off for it to run, when it has run the more I block off air using the choke the faster it runs, I am 17 and I don't have a ton of knowledge on this kind of stuff but I'm kinda thinking I wrecked the governor or throttle system, would appreciate any ideas that anyone might have thank you

You have made a great start in overhauling your engine. You are now overloaded with information. It appears to be a fuel problem. Exhaust glowing red hot indicates a very lean mixture or Cam timing problem. Check all Fuel lines. Blow them out (cap OFF tank) outside as fuel will splash. I suspect there is a carb problem. Remove the Emulsion tube and be sure all the tiny holes are clean including the one on the Float Bowl bottom Jet. If there is one! It is at an angle at the top of the threads.
You should be able to get the correct Linkage configuration from manuals. Check Float level and needle and seat operation. Good Luck. You are gaining a wealth of info. Ask your teacher to visit. The worst he can say is no.

 

[grumpyunk]

You might be concerned that the throttle will be wide open when the engine is at rest. That is normal, as the governor will close the throttle to control rpm once the engine has started. The manual engine speed control just adjusts spring tension set to open the throttle which is matched by governor pull to keep the rpms in check. Add a load, rpms drop, governor weakens and allows a bit more throttle. Remove the load, engine rpms go higher, governor tries to close the throttle to keep rpms constant.
Requiring choke to keep an engine running in most cases indicates something constraining fuel flow. ABF solenoid can reduce flow, blocked jets, gummed up emulsion tubes, clogged filters, collapsing fuel line, and clogged fuel tank outlets can all reduce fuel flow. You need to check for full-diameter fuel flow at the carb inlet, and be sure the ABF, if equipped, retracts to allow adequate fuel flow before condemning the carb, etc.
tom

 

[kjonxx]

I'm proud of being in that minority . As someone who was self taught, working on engines can be stressful at times and it's a lot when you first start, but as you get the hang of it, it starts to come to you naturally over time. Good luck @wywy, it looks like you're on the right track.

Maybe your timing marks on crank and cam are off.

 

[zrxkawboy]

My first thought is a vacuum leak.