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I was reading last night about the aluminum used in the coolbore engines. It is a special Aluminum-Silica alloy. After the cylinder is bored at the factory it is sent thru a special process that etches the aluminum bore to eat the aluminum and leave the silica on the surface of the cylinder...

Tried to find a how to on removing the low profile valve guide seal in Briggs and Stratton 120000 L-Head engines, but could not find one. None of the other videos where people were rebuilding a Briggs and Stratton 120000 series engine showed that seal being replaced. This is an important seal...

Probably both.

The intake guide is not too bad but the exhaust has too much play in it. Probably will send it out to a cart racing shop to have them put in new guides. No one does it around here. And I lack the reamer kit. None are for sale right now (1/4" valve .2440"). I noticed someone replaced guides in...

need model and serial number to find an owner's manual. If you already have one, have you read completely thru it. That is the first step.

You'll be $250 to $350 into a replacement engine. Rebuilding yours if you are good with that will be equal in parts, and they may be hard to find. A lot of the engines manufactured now are metric so you may need to replace the blade adapter too. I'd make sure the valves on your present mower are...

thank you

hole in piston would be my guess. Probably overheated and melted the crown. The gases push the oil out is usually what happens. A bad valve won't usually push all the oil out. Unless you are good mechanically enough to build an engine, or have someone you trust to do that, might just figure on...

This thread started because of the Led-Plate and the current manual insisting on it. I wonder how many other things are outdated with Briggs data. Has anyone else had trouble with their pictorials for their specific engine? I ordered a thermostat for it based on the model and serial. The mower...

depends on the type of grass. The only thing I can say about 4" is that we mowed at 3" for years. You mow to 3" then it grows to 4" before you mow again. You mow at 4" and it grows to 5" before you mow again. Our retired show lady dog was touching the grass when she pee'd with it mowed to 4"...

Tell me if you know. Has anyone ever radiused these sharp edges to get charges in, and exhaust out of the cylinder with less turbulence? Should run cooler too. RPM is limited of course for a mower, but more charge in and more exhaust moving faster on the way out would lower head temp. Just a...

yes. My fault. Cleaned heads. Cleaned grime off carefully in parts washer, and heads in glass bead machine. Still have to wash it and blow it out to make sure all bead residue gone, then check it with a straight edge. It was 60F this morning and 75F - 80F with a breeze all day until about 4pm...

I pulled the head off. Pictures don't do justice. The cylinder is normal except on the exhaust side where there is discoloration and extremely light scoring from the carbon. Cross hatch is all gone. It feels rougher to my finger nails but not scratches and not gouges. The exhaust valve is almost...

There is a place online that sells parts for gun enthusiasts who sells a small tin of Armite LP-250 for about $6. It is the same as the Led-Plate. https://www.shootersconnectionstore.com/Browse-by-Manufacturer/JP-Rifles/Armite-LP-250-Sear-Grease I had considered ordering some if it was...

yes, it is a great mower. I've got parts to do a full carb rebuild on it, and will check the seats and valves. I suspect the biggest issue will be wear on the valve guides, and I will have to decide whether to put in new guides or run it 'till it is done. Probably between 450 - 600 hours on it...

Thank you.

Thank you. I went thru the back axle and wheels in April of 2023 so the grease is only 3 years old. I was trying to avoid the extra work by just zerking it, but yes, it is probably just better to do it again and get rid of the dirt and moisture too. Nothing should be worn out this time so the...

Thank you

I have never used anything but oil or assembly lube like Ultra Slick. It is very similar to the Torco assembly lube that cam makers supply. Just following along with what the manufacturer says to use. Supposedly the led-plate will last longer than assembly lube or oil. Considering how much...

Pull the carb off and clean it again. With the carb inverted blow into it to see if the seat is working, You can also take it off, hook it to a container above it that has fuel in it to see if the carb overflows after a few hours. Fuel pump diaphragms do fail sometimes.

My tiller had a Tecumseh engine. If yours is a Briggs and Stratton engine there are pages of carburator linkages they used in their Single Cylinder L-Head engine repair book. I also just looked in the Tecumseh service book and quite a few are in it too by engine type. Don't know if that will...

Am in the process of doing a lite overhaul on a Briggs Engine, a 190cc L-Head. That will include cleaning the combustion area and checking valve lash. The Briggs book goes into using Led-Plate #93963 on the stems if I take the valves out, which is probably occasionally available on Ebay but most...

This is a twin, right? You say it is completely dying, not just one cylinder dropping out. Ask yourself, what are the things in common both cylinders share. 1) Any parts of safety switches or ignition switch 2) Kill system like oil sensor 3) Fuel system 4) fuel pump if it has one 5) system...

Some mowers won't charge a bad battery, or some that are low. Did it ever work? How old is the battery? Has it been charged on a workbench, and tested to see how much life is left in it?

A couple years ago I rebuilt the rear drive on my toro super recycler. The drive washers and key etc., were somewhat worn. What caused it to fail at that point was I lubed the zerk fittings at the rear wheel and the grease was enough that the drive on one side died. It is time to lube them...

at rpm the water will, as slomo stated, and I suspect the trolling post asked :) steam clean the inside of the combustion chamber. GM used water as means of knocking excess carbon loose for years. A very slow drizzle is all an engine can tolerate before it stalls. That is because it is mixed...

start looking for intake air leaks. Make sure the fuel line is not restricted. I had an edger do that, the idle jet fell out. It was a set jet that screwed in and not an adjustable one.

when you adjusted it, did you place it between both sets of lines when at room temp?

I saw that one and a couple like it but the top is completely different than 698281. All the sold ones labeled 698281 have the same top as his. I am concerned that it may be for a different engine.

Q. to assist the OP, I looked on Ebay last night and again this morning but could not find one that matched his exactly. When I looked at sold items, there were quite a few, and the all matched perfectly on both sides. On those the sellers also input the 698281 part number. Did anyone find an...

try putting it on facebook marketplace.

I'd get the VOM out, hook it up between ground and the solenoid, then turn the key. If you get 12V then you put the VOM on ohms and check between the negative battery post and the starter case. If you have a good ground check between the negative battery post and the solenoid ground. That will...

change it when it is hot and all the particles are in suspension. If you wait until the next day they settle so many remain.

not when they are broken

https://www.lawnmowerboneyard.com/ https://martinsoutdoor.com/collections/used-parts https://adamssmallengine.com/ https://www.haraldonline.com/ there are many other places. May have to call each one. Trying to help you find one I came across a post on Facebook where someone else is looking for...

yes. The timing is off with the new flywheel. Not just off but way off. The simplest solution until you can find one, and there are none on ebay that I could find. New is NLA and no one is posting a superceded number. You can pull the rest of the magnets off, use a rotary sander to remove the...

They are not the same flywheel. The timing is significantly different. Jack's shows 698281.This is from Reddit.

did you check the oil first? How old was the fuel? Did dad install a fuel shutoff that you forgot to turn on so it ran until the carb emptied?

when a cylinder is honed to an oversize, it is not just the steel that wears away. The stone wears too as the cylinder is honed. There is an optimal overstroke on the honing that has to be maintained to keep the stones wearing even. If the stroking of the hone is not proper (which is probably...

machine shop. A DIY would never be able to keep the bore straight or the correct clearances. If no one wants to do it, take a look around for people who go cart race. They will know who is set up for it. Might want to have them check the valve guides while you are in there.

that smoke may (or may not) have been a mouse nest burning either the exhaust or inside the shroud. If a mouse got in there it could damage wiring. Sort of puzzled though why it spins completely normal with the spark plug out but acts goofy when the plug is put back in.

did it spin freely with the spark plug out. That is an important thing to check Did you check the exhaust to see if it is plugged with a mouse or mud dauber nest. Did you check around the blower housing to see if a mouse built a nest in there and the debris is interfering with the fan spinning...

warm the engine, drain the oil / filter etc. See what it looks like. If it is full of carbon and debris, plan on running it say 8 - 10 hours on the new oil, then drain and do it again.

^^^^^ this ^^^^^^

take the spark plug out away from any ignition sources like a gas water heater etc., and try spinning it. See if fuel sprays out of the spark plug hole. If it does then that will confirm the carb is the problem. If fuel comes out the plug hole, the engine is hydro locking. Try to figure what...

Maybe I missed it, but did this start with a new belt, suddenly start one day, gradually, or are you a new owner of this edger? The one I have similar to that, the quill is loaded by a spring. Does the spring work on yours or is that area rusted and frozen? Meaning that as the quill is lowered...

please include the model and serial. Did this start before the belt was changed, or afterwards and before the parts cannon was fired?

I owned an earlier 26" version of what you have for 25 years. The speed control is on the side cover. As I recall, the lever slides from stop on the left to fast on the right. The choke is on the same side cover. You move the throttle to the position you want it to run. The linkage would...

do you own a volt meter?