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I submitted a reply yesterday and this slow site did not let me post my reply. One more time. Site is erratic speed, etc. Does the engine run at WOT or are you just seeing WOT with the engine not running? WOT with the engine not running can be a normal thing is why I ask. Here is a link that...

You need to read the pto clutch amps. Do you have a ammeter? or install a 10 amp fuse or ckt breaker in the electric clutch ckt. You can get automotive type ckt breakers from Amazon in a kit of several sizes very reasonable.

Normal for that machine.

On your idlers make sure that they are the correct OD. It's quite common now days to order the correct v belts by part number but the size you receive is not per specs for the tractor. I use a upholstery tape measure, cloth type tape 1 inch wide and about 12 ft long from wal mart sewing...

and autopilot let it crash!!!!!!!!!!!!!!!!!!!!! (and burn) still really slow in most threads.

I would use a electrical tester and do some logical testing. (instead of farting around) You can get one at wally world and read the instruction manual about how to use.

Is your starter solenoid a 3 terminal or 4 terminal? (does it have two small tabs (for small push on connectors) or just one?)

Look at page 30 of the owners manual. It appears that maybe on that machine: When you are not on the forward or reverse pedal the belt going toward the engine pulley should be loose/slack enough that it slips on the engine pulley for neutral. Also make sure it's routed correctly per the diagram...

How was the drive motion acting before you changed the drive belts. I seen a owners manual/parts list download at the sears link. https://www.searspartsdirect.com/manual/5efdw0nkch-000736/mtd-13ag601h729-front-engine-lawn-tractor-parts Keep a heads up when working on the brake if replacing the...

Ronnie Milsap can see that is no good.

Yes. (very slow or no go. I had to copy/paste my post into word and then come back couple hours later and try again. By saving to word I did not have re-type all again.

Read post #10 again. Install a 7-10 amp fuse in the pto lead and test. Also look at the existing fuse holder carefully. I've seen fuse holders that do not make good connection at the ends of the fuse and they EVENTUALLY get hot and melt the fuse due to a bad connection INSTEAD of a current...

Some people (several) should not be allowed to even own a mower much less try to operate one.

We need the complete model of your cub. But I've got a Cub and it's common for the clutch spring to fall off when the drive belt gets too loose. You can download a parts lists that shows the spring to see where it attaches or remove the deck, elevate the mower and you can see where it attaches...

Be aware if you try to look for a Walbro LMT using the Briggs part number for your engine's carb you will be directed to the Nikki replacement carbs, so when searching ebay you will probably have to search for a USED Walbro LMT carb. (and look for the name Walbro LMT on the side of the carb)...

Put a saved search on ebay for a Walbro LMT. I keep one around just as a sub for the Nikki's. Some of them China Clone Nikki's will never run right even when new. Lots of info on-line (you tube) about how to kit them. I buy the clones from Amazon on-line with free returns, sometimes have to get...

You say it also leaks oil when the engine IS NOT RUNNING. If so this should be easier to locate the leak. Might could use a dye in the oil to locate the leak. Use about 1/4 oz of motor oil dye. You can review such on-line.

I did not read all of your post, but if you will get the EXACT model number from your mower, usually from under the seat and download a free owners manual it usually has all the exact steps for replacing belts and adjustments for the GT series of tractors. Instead of using a jack for lifting...

Here is a link where you might find manuals and wiring diagram for your Cub Cadet LTX1040 EXACT model number. https://www.partstree.com/models/ltx-1040-cub-cadet-42-lawn-tractor-parts

You say from post #18: The seat switch has been unplugged for years now. AND Lets be a little bit reasonable That is what caused the guy in my post #20 to expire. HE had bypassed the seat operator presence switch and fell off the mower and it ran over him. It was his own doings. Just saying...

Safety switches: WHY You asked: Why so many safety switches, are they really all that neccessary? Can I just disarm them? It's your call, but think about this. The safety stuff is mainly to reduce the chance of spilling a hot cup of coffee in the crotch and then hiring a HOT CUP OF COFFEE IN...

AND hang onto your OEM Walbro carb. The are easy to re-build and usually result in a better carb than the replacements. Rebuild it as a spare in your spare time.

You might think about: Instead of hosing off a deck for debris removal try using air pressure or a leaf blower. Reduces the amount of rusting.

try this link for a free download of the 272144 Briggs SERVICE manual: Some other manual available also for other types of eq. https://www.lilredbarn.net/category-s/85198.htm

Brand New=under warranty

Only tool I lend is, I keep a Poulan chainsaw that I do not like as a loaner and for some reason it's always finds itself back home and running ok. Really wished it would not come back. If I try to use it I end up having to do a repair of some sort.

As mentioned in post #7. I keep a heads up when I see shift levers that can probably leak due to a bad boot or some did not even have a boot. I install a umbrella on the shift lever close to the xmission. Can use a stout plastic pill body or eqiv and fill the underside with grease and slide it...

Honda engines from a pressure washer. $50 area

I've seen those type and usually the star center is stripped out and the spindle bolt star also stripped. Also seen the air filter completely clogged. Adds new meaning to the term "rode hard and put away wet" They asked me to check their engine as to why it would not start. Like whipping on a...

I've seen them cooling fins get clogged from grass clipping, get engine get too hot and pop out valve seats. I use compressed air or a gas or battery type leaf blower and clean the complete tractor and deck after each mowing. Pay them now or pay the new mower dealer later if you ignore this. It...

Also you can go to little red barn.com and download a FREE service manual for your engine. Lots of other FREE downloads there also. Try this link and select twin cylinder "L" head https://www.lilredbarn.net/category-s/85198.htm

Are you now saying that it cranks but does not start? What do you mean by smoking after it shuts off? (smoking out muffler or what???? Since you are in love and want to keep that engine invest in a Service Manual. Here is a Service manual for those engines on ebay. Just type this number into...

Because some will not turn on without a certain input voltage. Strange but true. If a external voltage (usually battery voltage)is not detected by some voltage regulators used on Lawn tractors the regulator will not turn on and no or very low DC voltage will be read on the regulator output...

Assuming it's plastic, not metal. I've plastic welded several of the PLASTIC gas tanks including the large rear mounted ones. I get best results if I can remove a piece of plastic from the tank I'm welding to use as a filler, but I've used milk cartons and zip ties as a filler. I use a large...

As Rivets indicates in post #17. Post up the engine model, type, code (especially the code) The rings on some had a parts number change per the code.

Have you consulted Al Gore?

and some links to rebuild you tube videos of the Nikki rebuild. Nikki Carb Rebuild Single Cylinder Briggs - YouTube and...

Some carb info for your single cylinder Briggs engines with the Nikki carbs: Briggs first used a Walbro LMT carb on those type engines as a more user friendly re-buildable carb. Here is some info about rebuilding your Briggs/Nikki single barrel carbs. and parts link. I get fast shipping from...

I would try to find a electrical schematic on-line and download/print of the machine and then troubleshoot. (since you indicate you have a electronics background and know how to use a voltmeter) To get a crank/click assuming good battery and fuse and fuse holder, ign switch. Normally the PTO...

Engine model, type and code?????????????

Read post #2 couple of times.

You can also use a IR thermometer and get instant readings at different place on the block. They are priced reasonable now days. Let the engine set and run at fast rpms for awhile and monitor temp.

Just a hint of what can happen sometimes. Main thing is the pulse hose needs to go up as it leaves the pulse port on the engine then the pump can be lower. Sometimes only a slight amount upward is needed. A immediate droop is not a good thing. Sometimes just takes a longer pulse hose to get er...

I route the pulse hose upwards before going to the pump barb. If oil eventually collects inside the hose the pump will quit pumping gas.

Old thread. Might just be throttle/governor linkage adjustments. (engine rpms too low at max throttle. The adjustment procedures are listed in the Briggs L-head SERVICE manual.

Whip out the plastic and go get a NEW MOWER. Seems to be the norm now days. Every time the wife gets a flat tire she wants to go buy a NEW vehicle. After she calls me to come install her spare. (and I most generally fix my own flats) We live on dirt/rock roads and have to use at least 6 ply...

Looks like the OP has ghosted us but: I repair my own lawn tractor/trailer tire flats. I've had problems locating really slow leaks in tubeless tires also, sometimes even using a water tub will not show a aggravating seep. I have two spray soap bottles. One has a large dose of Dawn dish soap...

Good to hear you got it going. Another weird one I could not believe. I received a free old model Horse tiller with the later model Tecumseh engine with no carb on the engine. It had the 2-3 inch intake manifold steel pipe still attached to the head. Sometime later I gently pulled on the start...

when do you decide to move into a newer mower? When the grass and brush is getting taller than the house, a jungle just to get in and out of the house and the mower is still broke.

You will get better responses if you start your own thread. the original posted has ghosted us. Post up the Model, type and code of the engine.