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Hello B., Whoa! What to say this is not a fixed RPM engine design intended for this mower? 3700 RPM is not what I would consider a bad governor or a "runaway" RPM. What mower chassis make, and model is this engine on? Does it have an actual throttle cable? How are you measuring RPM? Some...

Many carburetors had a fiber material type of seal that would keep dust away from the shaft. Excess dust would gradually cause wear and excess play which would draw in excess air. The O-ring is a good substitute as long has it does not cause drag and delay the throttle operation.

I suggest you pull the upper fan shroud and remove the coil kill wires, then install the fan cover and run it to see if the problem is still happening. If it still happens, you will need an adjustable air gap spark tester, not the "flash bulb" type because they are not reliable. Check the...

The cap is supposed to have an O-ring seal tucked up inside that seals it to the fill tube. If it is cracked or missing, you need a new dipstick.

Hello J., In reference to the pushrods, they look normal. Everything I am reading points to a defective carburetor leaking fuel into the crankcase. This problem will create lots of smoke and spitting over-thinned oil out of the exhaust. Stop digging around in the motor "looking for a problem"...

You don't try to run these engines with the cover off. With the valve/rocker cover off, it will quickly sling all the oil out of the engine. The cover keeps the oil in. This is the concept with most small engines with "splash" lubrication. Even the ones with oil pumps do this.

Famous last words: Trust me I'll pull out.... LOL

Are you talking about where the intake bolts to heads? That is a critical area to get sealed.

Are you sure they are missing or was the shaft machined that way? A picture would be helpful.

Nice project machine with lots of potential. My advice is to remove that old "radio noise" capacitor from the coil, it is garbage by now and it will prevent the coil from firing.

Good! To get the best performance, adjust the screw with the throttle on high. slowly adjust the mixture screw to get the best rpm out of the engine. To go one step further, move the throttle level with your finger a little farther and see if the mixture is still good or needs to be dialed in...

As far as I know, the plate has to be purchased. If it bent a push rod a valve guide coming up out of the head is a real possibility. He needs to push down on the valves and make sure they can open. Otherwise, he is looking at replacing the head.

Hello Newbie: We need the numbers that are stamped into the valve rocker cover to properly reference what engine you have. What color is the smoke? Black is excess fuel, blue/white is oil usually. Sounds like the engine fan cover needs to be removed and the engine cylinder cooling fins need a...

The fuse holder looks like it was around a leaking (gassing) battery for a while. Corrosion in connectors builds resistance and resistance build heat, that is why the plastic of the fuse melted. I hope the new one you put in was a heavy gauge wire with a 20A fuse. As for the fuel solenoid, I...

Hello L., Intake valve seals could be tired and worn. Verify the crankcase breather is clear and there is no air cleaner to carburetor gasket restrictions. The only other concern I can think of for the moment is if the carburetor is weeping fuel past the needle and the engine oil is getting...

Hello R., It is unusual, but power outages are not. The deep freeze we had here back in Feb. '21 reminded me of my youth in central Va. where it is was expected. Down here, it is rare to even get to freezing for more than a day. I was not fully prepared or well-equipped as I am now. During...

Item 22 in the diagram. It likely popped a retainer clip off. https://www.partstree.com/models/xt1-lt-46-kh-13apa9tta10-cub-cadet-46-xt1-enduro-lawn-tractor-kohler-2023/drive-9/

Yep, the old flathead aluminum and cast-iron engines were some of the easiest to work on and very reliable if a person kept the oil changed and tuned them up once a year.

Hello R., This is what makes working on small engine equipment so tricky even for professionals. Each mower chassis manufacturer requests different parts and functions that make them different from the "other brand". Years ago, a person could go to practically any hardware store and buy pretty...

Hello G., Years of military training and "country life" in general has taught me to prepare by using 2 to 3 levels of "backup". Fortunately, we still have non-ethanol fuel and E-10 in my area, but E-15 is gradually being implemented. E-15 is just more trouble, and I think even the fuel...

Hello G., With my 5500 Watt storm responder I am using gasoline for starting and warmup, then I turn the gas fuel valve off and let it run until it sputters out of gas. Has it sputters near shutting down, I open the valve on the 20lb. propane tank and the engine keeps on going. It's a smooth...

Hello M., We need the product label information off of the chassis to know how your machine is built. I don't recommend experimenting with belt sizes because that seldom works. The most common cause for a deck belt to jump of is if the belt pulley guides have been bent back or moved out of...

Hello R, I missed your reply back in February and got sidetracked due to medical issues. The difference is that gasoline will burn cooler and eventually carbon foul the sparkplug. Propane on the other hand burns too hot during combustion and will create piston damage. Propane can still foul...

Make sure you check all of the pulley guides; they often get bent out of place when things like this happens. The guides have to close to the pulley on each one.

Please provide the product label information located under the operator set (usually). This will give us a better idea of how your machine is assembled.

Toro does not make the engine Briggs and Stratton does. Thes engines are used on various kinds of equipment. Maybe some small engine repair videos might help provide some kind of picture for reference. Here is one I found online...

Anything is possible if you can fabricate and weld.

The JD owner/operator manuals are basically poorly edited/ reworked 20-year-old reprints that give only very basic information. They are often not model specific regardless of the cover on the book. The Drive belt and pullies need to be checked to make sure they are not broken or gone bad. That...

Please clarify what kind of wiring issue you are trying to resolve. Have you checked out some of the various diagrams for a match. Just because the machine was purchased in 2005, does not mean it was built then. Many machines will sit in and inventory for a couple of years before being sold...

Hello H., "Bucket Motor" is a slang term that I have heard quite a few people use to refer to this engine design with a top cover plate. Metaphorically, all the parts were dumped into a bucket, and the lid was put on. These engines do eventually leak around the top seam from metal expansion...

Actual OEM parts are seldom available, but here is a good source I use: https://www.partstree.com/models/22040-toro-21-proline-recycler-ii-walk-behind-mower-parts/?msockid=36285c773bf46d9120e04b183a3d6c1c You would actually need the engine numbers for specific engine related parts because Toro...

Remove the deck, then jack it up to remove the drive belt enough to drop the transmission for access to the cooling fan. Sorry, there are no quick shortcuts to do the job right.

Everything needs to be properly assembled and the primer working for it to start. Trying to start it without the air cleaner will just pull in straight air.

Double check your fuel mix and make sure you did not mistake a wrong straight gas container for one with mix in it.

Take the muffler off and get it red hot with a torch to burn out the slag carbon buildup. I have recovered many 2-stroke engines by doing this. If exhaust cannot get out, fresh air cannot get in for the carburetor to pull in fuel efficiently.

This seems to be a chronic problem with rogue bots.

Pull the carburetor and remove the bowl. Then remove the float and needle to check for debris in the needle and seat area. Often times, fuel filter do not catch fine particles, and they get pinned between the needle and seat. This creates a flooding condition and will stall the motor.

Hello T., I have also had that happen in the past and I contacted the administrator and posted about it. They were having issues with bots in the network. Maybe it is happening again. My advice is don't use your phone for anything but making call. Smart phones can be stupid and 3rd parties can...

We need the manufacturer product label information for your mower. I know the generic standard for most small engine equipment is 3600 RPM maximum without any load. Some manufacturers reduce the top running RPM so the drive system will not outrun the operator.

The rod on the throttle arm of the carburetor is controlled by the internal governor of the engine when it is running. This is a fixed RPM engine design. I see it has no choke, so it has a cold start primer on the carburetor air box. The only thing your handle control operates is the ignition...

I use regular Castrol 20W50 engine oil for the hydrostatic transmissions most of the time. Synthetic is overkill for any machine with high hours.

Check the transmission to chassis bolts. There have been a lot of them come loose in recent years. The manual assembly labor workforce that care about their actual work is getting less all the time. You can never pay a lazy person who is well fed enough money, they just want more to do less work.

We need the product label information off of the label under the seat. There may be bushings on the center front yoke that need to be replaced as well.

Hello T., Posting multiple times for the same machine and issue is annoying because it creates clutter. Many folks will simply avoid your postings. Post one machine and problems at a time and edit as needed in the same posting. Remember we are trying to help people and doing it for free when...

Hello C., Glad you got it figured out. This is the way many things get resolved if you have the determination to see a problem through to a solution. I've been a technician for 40+ years, and I still call on fellow techs when I get stumped.

While you are that far into this, make sure the fuel tank is clean and the screen in the bottom (inside) is not gummed up and blocking the fuel flow. Modern fuel tends to gum up when it ages due to all of the refinery additives.

Hello C., (More thoughts) From my automotive training many years ago, one thing that has stuck with me is the ideal fuel to air ratio number of 14.7 parts air to 1 part fuel. If enough air cannot get in the fuel bowl as the engine is demanding the fuel, a cavitation effect can take place. The...

Hello C., "Nothing ventured nothing gained" is a saying that seems to fit when no one can provide a direct answer. I suspect many people have either lived with the running issue or gave up. Aftermarket carburetors are a luck of the draw, and many have gotten better over the years, but they are...

A manually adjustable automotive style inline fuel pressure regulator placed between the carburetor and the fuel pump would resolve this issue. As Star Tech indicated, these carburetors only require a very low PSI fuel pump to operated. A typical parts store automotive electric pump produces...

Never seen Honda Bond turn black before. I'm talking about the white version Honda has used on their engines for many years. The next sealant suggestion is Permatex #2 in the tube, it takes a little bit of time to fully cure but it works great. From there I use Permatex Ultra Gray and give it...