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this one is a little higher than than 7.5:1

This tester works good for small engines

In the summer of 1974 i worked at a small airport as a ramp tramp in the maintenance shop. I changed lots of oil in lots of small planes. Most didn't have a filter but rather a fairly coarse screen that might stop fine sand. I asked the head mechanic why no filter. He said dirty oil under...

https://www.ebay.com/itm/165527851388?_skw=nikki+jet+oring&itmmeta=01KW9JMFSKSW4B3WXFPQBQJ8B4&hash=item268a3a917c:g:oyUAAOSwlLdcyxGB&itmprp=enc%3AAQALAAAA8GfYFPkwiKCW4ZNSs2u11xBrHwJGpnTVGfY2MhFnX2s6zymdkIgZ62bikWSepGSDG3EhO8DxLG9WOsxvAxzYQPsy2jRZ6W1A6LDC1QmIRYgrps9PwJpMb1pNfgS9btzToEzq7l6%2FUBCUj...

Just went through something like this on a 731. The original coils on older engines have internal diodes. The aftermarket coils don't have diodes. Not 100% sure but the internet says the new OEM coils don't have diodes. I had a bad coil and couldn't get a new non diode coil to work with the...

Many commercial mowers use a tank pickup like this. Most residential mowers just use a pickup tube with no filter.

I have the Lisle ones and if not careful they will pinch the s__t out of you.

The best thing i have found to cut thhose rock hard tires is an oscillating tool with a hooked carpet blade. I cut the tire rubber off close to the bead then cut the wire bead with a cutoff wheel. But usually i can break stubborn beads with the floor jack and the hitch on my truck.

I change quite a few tires. I have the HF manual tire changer and the mini tire changer. I have a bunch of tire tools, tire soap, bead sealer, bead blaster, plus other stuff. I don't enjoy changing tires but it's not hard with the right tools and you learn a lot of tricks and tips.

Call me a radical but i put a little plain old red grease on the threads of all the blade bolts and nuts.

Yes

Run it for 5 mins. Then remove the plugs. Do they look the same? Oily? Black gunk?

🍿

"The rod and crank journal cleaned up good with some Scotchbrite." Did you install a new connecting rod?

Run it till it dies. Check for spark. If it has spark remove the air cleaner and spray a small amount of starting fluid into carb. Does engine start and run for a few seconds. If yes it has a fuel problem. If no then compression problem and need to remove carb and tank and check valve clearance...

This kit off Amazon has a bunch of thise type springs and a couple with one unbent end so you can make whatever you need

As a hack i always default to the BFH. 🤪

I converted mine to 050 bar, felling dogs, side adjust chain and gutted muffler. Great little saw.

Some kit have the chain adjuster and some don't.

"Back in the day" of go karts with 5hp briggs racing on dirt everyone used the same green foam sock air filter. Some oiled it and some didn't. When the track was really dry and dusty the oil guys had the filters plug completely covered in a layer of oily dirt. The no oil guys just slapped the...

I just get them off ebay.

I have replaced a bunch of the stupid quick adjust chain tensioners with kits to convert to regular type.

A generic honda coil works.

Those engines are prone to the crank seal on the PTO end just falling out of the block. Pull the PTO clutch and check the seal.

I wonder where Scrub is on this controversy? But all i know is the gap i set is better than the gap he sets. 🤣🤣🤣🤣🤣🤣

If you have an air hammer get a bolt that fits the crank threads and drill a divot in the head. Install the bolt in the crank with the head against the end of the crank. Use a pointed bit in the air hammer on the bolt. Never had one i couldn't get off in just a few seconds.

Anything with an aluminum bore i don't bother with. I do use a ball hone on cast iron liners to add a slight cross hatch to seat new rings in a std bore. Not worth trying to hone to oversize piston and rings.

There are 3 versions of drives on the z425. 2 have separate wheel hydros and one has a central pump and wheel motors. If you have the one with the goofy angled pulleys double check the release isn't pulled on the hydro. That is the fun one to change the belt on.

The chineese carbs are getting better. If a honda or a honda clone comes in with carb issues i just order a $15 carb. I have changed dozens and they work just fine. I change a couple dozen carbs a year. Most folks won't spend the money for an OEM carb for a hand held. I get burned a couple times...

There isn't a single mower shop around me that will open an engine. Not even for a simple sump gasket. They don't do valve jobs either they order a new head. Asked the JD dealer i get my parts from and they say not cost effective to open an engine. I used to rebuild engines till the machine shop...

Sounds like piston slap from too much clearance.

Did you hone a few thou off the cylinder with a hone with stones or just break the glaze with a ball hone?

. You use it when somebody else is going to take is apart next time

While you are at it pull the flywheel and fix the the leaking breather cover. Seems like every Kaw engine i have got in lately has either a leaking breather cover or govenor seal.

Wrong fuel filter Crap in tank plugging pickup

Indian head gasket shellac for the win.🤭

I beg to differ. 6 bottles of motor honey and a couple quarts of 40 wt. Helped me in high school to sell a 63 Galaxie with a ragged out 352.

Just so you know Oldfart, Startech is THE OG when it comes to parts and bulletins. The E.F. Hutton (if you remember that commercial)so to speak of the board.

I tried it in my 1975 IH 184 lo boy with a couple thousand hours on it. Didn't seem to make any difference. Switching from 10w-30 to 15w-40 worked better.

This is what you are looking for but just 50 years too late.

Back in the 70's the difference between a garden tractor and a lawn mower was that a garden tractor was rated for ground engaging implements such as a plow or disk. The Cub Cadets and Sears ST and Suburban series and others were built like small tanks. Nothing today is built like those were.

Most of the small low pressure fuel pumps on amazon don't last long with gasoline. (Ask me how i know). Enen the ones that say they work with gas don't like ethanol gas.

Or you can roll the dice and take your chances with amazon

Jack's has it

I got this in the shop. Kaw horizontal twin with leaking breather gasket. Picture doesn't do it justice for the oily dirt and grass goo. Already cleaned ip about half the mess.

I will give anyone here $100 if they can damage a lawn mower engine with starting fluid. I have used starting fluid on hundreds of small 2 and 4 stroke engines. Ether has less energy density than gasoline. It just vaporizes easier. I have given people a full can of starting fluid and had them...

I rebuild those nikki carbs all the time. Even use the cheapo gasket kits off ebay. Never had a problem.

Did you replace the 593890 $350 fuel pump or the $10 lift pump? The EFI pump is a common problem.

Here is a pic of a bare block. The plate with 4 screws is the breather. Usually when they leak the air off the flywheel blows most of the oil down the left cylinder. You need to remove the intake manifold and the flywheel to get to it.

On top of the crankcase above the carb between the cylinders. A plate with 4 screws.