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A Infrared temperature gun will check exhaust pipe temperature if you have one .

From what i'm seeing on the spark plug you may want to consider taking a look at the spark arrestor screen . It could need cleaning . There's videos on the procedure .

RPM can be calculated with : RPM x drive pulley Diameter divided by the driven pulley diameter . Measure the dia. of the 2 drive pulleys pulleys and calculate the RPM difference of the driven . This isn't the answer to your question but i suspect someone will ask for the answer of the driven...

"The mower seems like it might have a mild, almost unnoticeable miss sometimes while not under load," ---------------------------------------------------------------------------------------------------------- A vacuum leak can cause that . There is more vacuum at low speed . Check hoses , carb...

The brush reminds me of one i modified to clean Cottonwood blooms from Condenser coils . Cut the handle off , chuck it in your drill and spin it for troublesome areas . Yes sir , i've done many things in my life other people don't do .;)

vacuum or air but be certain the area between the engine head and the shroud is clean too . That air flow can be determined while the engine is running by holding our hand down around the spark plugs . It's possible for a mouse build a nest in that area overnight . That may not be possible for...

Try it without it and if it leaks then doctor it with anything recommended for sealing gaskets . A paper thin coat is the most i recommend . Hundreds of gaskets are sealed with a purchased sealer every day .

If the carburetor has a plastic float valve replace it with a brass .

Runs rough at idle , will it smooth out at hi speed ? If yes look for a vacuum leak .

For 60 years i've wondered what that thing was i saw mowing . OMG

Valve seals , if you by new seals possibly install instructions come with them . Long shot ? yes but free .

If the wheel rotates CW the nut usually loosens CCW .

A Vernier caliper can be bought for as little a 8 bucks and they are useful for numerous measurements . A digital more expensive is handy too .

If anyone needs a blade more balanced than grams , I have a antique powder scale i can get a blade to balance withen 5 grains . Postage pre-paid both ways .

I believe that switch in the open position is run and closed is kill it . The experience i've had a lawn tractor can be wired to kill the mag or not kill the mag in either position , depending on the wiring design and application . ie - the seat switch is open when off the tractor and that...

If the mower form mechanics could have the engine number they may be able to tell you which engine will bolt to the same holes and the size of the crank and drive pulley .

If you'll buy me a plane ticket i'll take that blade to Denver and get it balanced . If they can't do it Paris i believe is the next step up . :ROFLMAO: https://www.yellowpages.com/denver-co/crankshaft-balancing

OMGAWD

Feel with your finger for a ridge at belt depth . The drive pulley usually wears ( fails ) first from wear .

I've seen 3 engines in my life that failed after the valves were lapped . All cylinders on a ford failed simultaneously after about 1,000 miles with broken rings from groove and ring wear . This lap job was done at a ford dealership . Second was a buddy that lapped valves of 1 cylinder on a...

My pocket knife blade dead centered on the hole doesn't have that problem . :ROFLMAO:

Lets go back to the basics rather than spend more money . We know it has spark (at the correct time ) , air and gas because it is running part time but not starting when hot . Possibly some of the shop owners here can direct you a item that heat may cause no start . Fuel is a simple test (...

I'm reading post that are tightening 12 mm nuts like we did on a TLA Clark with 2-5/16" con rod nuts . :LOL:

OH , now i recall how we tested hardness long time ago . If it can be easily filed with a good mill bastard it's not very hard . If it files more like a Cold Chisel it's a tougher better blade . IMO

If it has spring loaded idler to tension the belt i would think a belt installed wrong would be evident ?

If impacts became illegal bolt manufacturers would go bankrupt .

Your county extension service may be more acquainted with those grasses in your area . Don't be surprised if they ask for a soil sample .

The oil use problem can be connected to the good compression reading . There may be mower mechanics here with tolerances of wear .

I've often wondered if younger guys know the oxidation needs removed from both components ? No , a clean shop towel won't do it . The oxidation is hard and a common wire brush won't do it either . I like the brush made to do that down to shining metal . I can't find it so i use my pocket knife...

I understood that deterioration by corrosion was causing it to spin . Would some of the various dielectric grease brands may work as well . II can recall i'll look for the ingredients on various brands .

Maybe those felts would prevent corrosion on the mower flat terminals too .

Do different brands of mower blades have the same hardness ?

Have new blades Hard Surfaced , Hard d. Old timers may call it Stu-Died . https://www.codinter.com/en/hardfacing-what-is-it-and-how-to-do-it-right/

If you can't t prevent that don't do it .

Before the oil and heat try my red neck impact . Tether a box wrench that's on the nut . With a Micky Mantle swing using a 2x4 about 3 ft long , smack the end of the wrench .

I believe you'll experience the advantage when you attempt to fit a metric wrench on a U.S. nut or a U.S wrench on a metric nut . No trips to the tool box or back to the tool box . Have you ever had to clean the corrosion from the battery post , screw , nut and cable end ? The C clamp makes...

If you happen to have c clamps that will fit the situation , they are excellent for connecting most lawn tractor batteries . Heavy duty are best but your light weights will usually work . These pictured when re-positioned to vertical make excellent handles for lifting and carrying .

You get pissed off each time you need to type and talk on the cell ? It's no wonder this site is bout to fold . New member has probably already dumped this site in the dumpster

IIR that completes the circuit by the mounting bolts grounding . I believe some have ground wire . If this incorrect someone please correct that .

Removing the spark plugs / plugs and see if it will crank might help to determine if the starter will operate when hot .

Jumper cables , usually only on sale at public auctions . Can often buy those for 10c on the dollar . There's enuff Cu in those to make Batt cables the remainder of your mowing days .

If a MTD will cut grass for 26 years it deserves new cables . lol

Russia wants the sea port the Ukraine has . They didn't even have one until the U.S.A awarded them one in the sea of Japan at the end of WW ll.

Put approx. a short table spoon of gas in the top of the carb and if it starts and runs a few seconds there's still a lack of gas problem . Flywheel key can be checked without pulling the flywheel , but being it ran for awhile my money is on ---- not flywheel wheel key ----

My father did similar on 28 Model A tires except he installed them because Goat Heads were puncturing the tires . It was accomplished by cutting all of the the side wall off and using the tread area of other old thin tires . No easy task but he was very well acquainted with not easy . In...

Cotton seed hulls do make a excellent mulch , but only if you don't have free ranging chickens . Why ? Because a chicken can scatter a half bushel just looking for 1 little yellow speck of corn that has gotten into it at the feed mill .

Make wood wheels .

I haven't seen any pics of anyone's clay top soil in a jar . Jars must be scarce . lol

Someone isn't pitching enough horse shoes . lol There isn't any grass to mow in that area if enough is played .

Has anyone had a blade come off be because the lack of torque ? I kinda doubt it . Even if a blade that comes off doesn't fly several hundred ft. killing a half dozen neighbor kids and their dog , it drops to the dirt with maybe a clang noise if it hits the deck once . Been there done that...