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Remove the rocker and compare that stud to the other one. It's either turned out or if pressed into the head it has got longer. Compare it to the other one.

Strange that both were leaking. Engine must have been excessively hot or the previous gaskets were not torqued in proper sequence and to torque specs or someone previously removed the heads and re-installed using the old gaskets. Head gaskets are pricy now days and some/most are China type.

What's the latest verdict?????????

You can maybe rig a Homelite duckbill vent. It's used in the fuel tank and fuel cap of chainsaws plus others.

Breaking news: On page 2 post #14 he indicates that the proper valve adjustment fixed his engine.

but while it revs much better without choke, the problem remains, it will only take maybe 70% throttle. ????????????Give us a hint as to how it acts when it QUITS TAKING throttle. Does it backfire, just hump up and start smothering like it wanting more gas through the carb or starving for gas...

154 hours on the machine. Is it still under warranty? Is this link the machine? could not find a 13VAV1CS009 ENGINE https://www.partstree.com/models/xt1-lt-42-13ava1cs009-cub-cadet-42-xt1-enduro-lawn-tractor-2015/engine-accessories-kohler-single-5/ Is it a Kohler single cylinder?

Need engine model, type, code info?????????

Doubt it's warped enough that it's the heads/block. Those use the thicker type head gasket. If it's the head gasket on both it's probly not been torqued in the proper sequence. You can check a head by lapping on a piece of glass, usually

Do as startech says. Use a UV tracer in your motor's oil. You can get a Automotive store. Review on-line how to use first. Be sure and get the correct type for motor oil. (not for water, antifreeze, freon, etc) Do not let the RV dry for long time once detected because it will be permanent dye...

What model and type Briggs do you have and what type pump is being used now if any AND Why do you want to try other than the OEM type pump??????????? Small engine electric pumps are expensive (around $50) and must be in the output range of 1-3 psi.

Need engine model, type, code info????????? If it starts with a prime it's PROBABLY your choke not working due to throttle linkage slipped ????????????

Do as startech says. Use a UV tracer in your motor's oil. You can get a Automotive store. Review on-line how to use first. Be sure and get the correct type for motor oil. (not for water, antifreeze, freon, etc) Do not let the UV dry for long time once detected use the uv remover immediately...

Need engine info, model, type, code??????????

Post up the model, type and code info of the engine. Using that model number from the tractor leaves room for lots of speculation and Cub used several different engines on the same model tractor at times so with engine info we can then maybe get on the same page as you. thanks

If we had your tractor model and deck size we might could give more precise info about your blade brakes. No need in blade brake pads if the belt is not correct because the pads will burn/wear out fast. On some rigs I've had to install addition blade break helper springs so as to hold the brake...

If that is Amazon Prime and the belt still looks ok and if it's wrong length send it back for a full refund, maybe. Usually easy to do with Prime just click on returns and go to UPS depot for free shipping. that is if you ordered the correct part number and the belt is wrong size, not your fault.

I've felt your pain. You have to be careful and not ruin the transaxle/transmission. I have a large puller OTC that is available from HF. I drill 1/2 inch hole in the rim on each side of the axle and apply pressure with the puller using long 3/8 bolts through the rim. I've also had to take a...

And sometimes you might have to go back after it's run awhile and reset just the intake lash. I've had to set some of them 31 series briggs at .002 to get a compression release due to worn/broken cam. To get a quick test if setting the intake lash to minimum gets a compression release on that...

Post up the engine model, type, code and the exact model number of your tractor/mower and we can then MAYBE give you logical answer to your questions and them MAYBE get on the same page as you. Thanks

And next time you are around Wal mart shell out about $4 and get a upholstery cloth tape measure in the sewing section about 1 inch wide by 80 inches long and start measueing the length of new belts and compare their length to what they are SUPPOSE TO BE and also measure the length of your old...

Just couple tips: A OPEN diode will not keep the magneto from firing. A shorted or low resistance diode will result in erratic/misfire operation. The diodes purpose is as isolation diodes, isolating one mag from the other when the engine is running. I've replaced those diodes with a 1N4007, 1...

Feel or measure the temps from both exhaust pipes directly off the heads. Both should be hot. I've got a IR thermometer that is really good for fast checking for a cold dead cylinde or comparing cylinder temps..

From your post #24 You say as it sprays unburnt fuel forward back out the carb as it starts to splutter and die? Fuel screw works at idle, too lean and it stumbles,. Did you ever check to see if the engine will still idle using only one cylinder doing the cylinder comparison test suggested...

From your post #24 You say as it sprays unburnt fuel forward back out the carb as it starts to splutter and die? Fuel screw works at idle, too lean and it stumbles,. Did you ever check to see if the engine will idle/run using only one cylinder doing the cylinder comparison test suggested...

Hard to tell for sure but I seem to detect that it's only running on one cylinder sometimes maybe. (or one cylinder is weaker) You can judge such by rpm drop as each cylinder is disabled, comparing one to the other. You can easily confirm such by sliding back the rubber boots on both spark...

your Briggs twin Intek engine parts list. You can also get a service manual for that engine if desired for around $25 TO30. (you might find a freebie download somewhere) Look for a Briggs Twin OHV, part number might be 273521. You have a problem with that engine that is not JUST the carb. I've...

You say: It feels like it's getting plenty of fuel without choke though, as it sprays unburnt fuel forward back out the carb as it starts to splutter and die? Tell us more about what you are saying here?????????? Is this as it's running fast with choke or what are you trying to indicate...

Right about the ABF (anti back fire) solenoid plunger. I've heard rumors that they can be tested on the work bench with a good 9v xistor radio battery but I always just use 12v. Make sure the plunger is fully retracting. I have cleaned up sticking plungers by using a oil and just keep on...

Just to give you a brief idea of their use: Those ports in the carb throat are called something like transistion ports. You can re-view such on-line. One is located on the air intake throat above the butterfly of the carb and its the idle port. Air rushing through the throat sucks gas through...

Did you look on the top of BOTH valve covers for complete engine info? sometimes someone will install a valve cover up side down and the info is not visible. Also if you decide to remove the welch plugs as a final attempt for good cleaning/rodding of the passages, I've removed welch plugs and...

I've never seen anything like that carb as being a Walbro.. (in the USA and your engine model number is USA strange. Make sure you do not have a intake manifold air leak. The chole and throttle is slightly different on the USA LMT Walbro's. Can you post up the complete Model, type and code of...

Contact dbelectric. You can find their info on-line. I've had good luck with their starters. You will need the engine model, type and possibly code. The more engine info you can furnish them, and the same on this site, the more useful and correct info you will receive.

Your carb appears to be maybe a Walbro LMT and Briggs quit using it and went to the Nikki and ruxing carbs. It's worth your effort to try to stay with the Walbro LMT because it's the most user friendly carb to repair and the smoothest running when all is correct. I'll post below couple links...

I would consider doing some logical testing using a voltmeter.;)

You can also use a regular thermometer and heat a pan of water to around 200F with most sensors and see what the gauge reads. A IR thermometer is really handy for such and other things and will take fast temps tests. I use one on Autos, Central heat air, etc. If it's electronic type make sure...

You might consider checking the temp with a Infrared thermometer.

What is the Model, type and code of the engine? The reason I ask for engine info is some spitting of gas back into the throat of a fast cranking small 4 cycle engine that won't start is normal thing on some engines and very misleading and cause one to get on the wrong page when trouble shooting...

What bertsmobile1 indicates above is quite common on those single cylinder OHV's if the throttle control cable is not clamped properly at the throttle plate on the engine. You can look/examine at the choke operation of the carb choke linkage if you remove the breather assembly and then move the...

Lots of good info previously: Just a hint that has been mentioned. Turn off the gas to the carb. Start testing with a dry clean spark plug and also crank the engine over se3veral times with the plug out to purge out any flood gas that might be in the cylinder. Set the throttle at just about...

Can you post up some pictures of the engine, showing the carb side? Was the rig running and quit or is it new to you. Usually on the 3-5 hp cranks kinda hard, i pull the rope until I feel the compression and then pull through fast and the weight of the flywheel and gen rotor turns the engine...

What is the complete model, type, code of your Briggs? This info is usually on the top of the valve cover if that is a OHV Intek. Sometimes someone will install a valve cover upside down and the info cannot be seen.

As bertsmobile indicated can your provide a craftsman/Sears Model number for the complete rig? Them old model 4 cycle gen engines sometimes had the ID info stamped into the metal air cowling, some on top and some under the gas tank. Small letters and number and sometimes have to use a...

Right: I did notice that. I was just indicating how to quickly test a small engine fuel supply using a fuel hose if no spare tank was readily available as a test. Good luck on your Nikki overhaul and keep the LMT carb in mind that I mentioned as a replacement. I keep a eye and ear open for the...

What I've done to get a test run so as to bypass the fuel tank/fuel pump is to take a 12 to 24 inch fuel hose and connect it directly to the carb input and then tie the fuel line elevated and take a small funnel and fill the hose with fuel and then start the engine. A small engine will run long...

Review that link I sent about carb repairing. Very good do and don't info in that link.

Yes and the two little o rings , itty bitty one that goes around the jet and some have a o ring in the bottom of the bowl. You can normally get a kit for your carb for about $9 that has all these parts plus other parts. (on fleece bay or otherwise) Post u[p a part number for the carb you are...

.003 intake .005 Ex Intake is the main one to get set at .003-.005. go for .003 because the ACR (compression release is on the intake valve BUT You say the engine cranks fast which indicates that the valve lash may not be the main problem YET. You say in post #7 when it's cranking fast you see...

.003 intake .005 Ex Intake is the main one to get set at .003-.005. go for .003 because the ACR (Automatic compression release) is on the intake cam lobe of the valve BUT You say the engine cranks fast which indicates that the valve lash may not be the main problem YET. (but can be easily...

Couple hints to consider: When looking at the $10-$20 replacement carbs you will notice that usually the Gen's carb choke linkage area is slightly different than just a standard carb, so be aware of such. Gen's carb sometimes have a long plastic lever that allows the engine choke lever to be...