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Well, it appears that the problem is licked!!! I installed a new air filter, and it ran smoothly at all speeds with no black smoke. I’m guessing that the fibers in the paper element in the old air filter had gotten wet, causing the engine to “suffocate”, so to speak. Although I can’t prove it, I...

Yep, I already mentioned in my previous post that I also drained the carburetor.

I just pulled the dipstick to smell the oil, and cannot detect any obvious gas smell in the oil. That was my first suspicion when I got the mower home three weeks ago. I’ve changed the oil since then, and the oil level is still dead on the “full” mark on the dipstick when I checked it just now...

In my previous post, I mentioned that the engine started and ran flawlessly, at all speeds, but failed to mention that was with the air filter OFF. Even after reinstalling the tube insert and breather tube, it ran flawlessly, at all speeds. However, when I reinstalled the air filter, the black...

I should also note that the other end of this tube attaches to the cylinder head, and not the engine block. Not sure exactly what that entails and whether I’ll need to remove the entire head to address the issue.

Well, I’m back from vacation, so I started back in on this JD tractor again. In following Hammermechanicman’s suggestion to check the breather, I removed the wide breather tube from the air intake, and I was able to start, run, and throttle up the engine without the black smoke and rough...

Thank you, StarTech for your expertise here. Since I don't have a leakdown test kit or the countersinks, I can however, clean the seat with Q-Tips and grinding compound, along with careful inspection of the bowl gasket. I did find new bowl gaskets and carb needles on eBay, as well. If there's a...

Here is the exploded view of the carburetor on this engine, to let all of you know what I have. It is a different carb than the one posted above in the link. Thanks for the posts, guys!

Thank you for the tips, 1fixitman! Your suggestions make a lot of sense, however, the carb is currently still on the tractor, and I'm on vacation starting tomorrow morning, and won't be able to pull the carb to see about the o-ring and plastic piece until I get back. I did print out an exploded...

I always clean the carburetors myself in my cleaner, and in this case the bowl gasket was not damaged or disturbed. It fit perfectly in the channels upon reassembly. Neither did the ultrasonic cleaning improve nor make the symptoms worse than before. I’m very meticulous when it comes to...

Not real sure how to test the crankcase vent to see if it’s clear or plugged. Also, I’m guessing that if there was blow-by, the oil would cause a different residue on the plugs than black, powdery soot, perhaps even fouling the plugs. There has been no sign of oil burning whatsoever to this...

Actually, I have not checked the crankcase breather. Could you please expound on that a bit? Thanks!

Yeah, not sure if I mis-read the hour meter or typed in too many zeros, but I know that mower has mowed two acres for many, many years. I’ll have to re-check the hour meter and verify the actual reading. So it may or may not qualify for the Hall of Fame. 🤔

Absolutely did that. As a matter of fact, right after reinstalling the carb after cleaning, I left the air filter off. Runs the same with or without the air filter.

I did find a 16030-7002 float needle valve on eBay for $23. It may or may not resolve the issue, but will hold off a bit until I get more input from the fine people on this forum. I have a full plate the next couple of weeks, which would allow a little time to gather some more comments. Again...

Well, because of my suspicions that the gas was making its way into the oil, the first thing I did was remove the carburetor, strip it down, and put it in my ultrasonic cleaner for two hours at about 160 degrees. Needle and seat were extremely clean when done, so there’s no crud. I searched the...

That was my suspicion when my brother explained the symptoms from the get-go, and I changed the oil anyway just in case that was the issue. Oil level then was just slightly over the full mark. I just checked the oil level, and it’s a little below the full mark, and just smells like pure oil, so...

I have my mom’s JD GX 335, with a Kawasaki engine, 8100 hours, (FH601V-CS04, ENO FH601VB29323), and trying to troubleshoot the rough running and excessive black smoke pouring from the exhaust. My brother was mowing my mom’s yard, and after about 20 minutes of mowing, all of a sudden he...

Very possible, Gebo, especially if the gas wasn’t stabilized or contains ethanol, since ethanol attracts moisture. I always fill my cans with non-ethanol, stabilized fuel. Great point!

It may be a good idea to check for possible fuel in the oil, since it appears the engine was flooded. Gasoline in the oil has a tendency to alter the mixture put forth by the carburetor, causing an extremely rich mixture inside the combustion chamber, especially if the crankcase has taken on...

I, for one, have gained much from the great professionals here on this forum. There’s a ton of very friendly, knowledgeable, and helpful experts that give great advice here. It’s obvious to me that Tim lacks patience, and didn’t want to take the time to do the testing necessary to pinpoint the...

I apologize for lack of clarification in the previous post, so I will do my best to give more details. What I saw was customers who stored their equipment for months on end with untreated ethanol gas. Another common issue was draining gas tanks that had a substantial amount of water in the tank...

https://anestwithayard.com/star-tron-vs-stabil/

I put StarTron fuel treatment in my gas cans before filling them with ethanol-free gas. StarTron was the only fuel stabilizer we used at the lawn equipment shop I used to work at. Service manager and lead mechanic said it was better than Sta-bil, so I used it in all my equipment during storage...

Sure sounded like a blown head gasket to me. Heard that sound a lot over the years. The part of the gasket from cylinder to the outside edge. Double check compression.

Is this the engine with the accelerator pump attached to the carburetor? Symptoms sound similar to my friend’s mower, with carb spewing gas and excessive vibration. Fuel was pooling up at the front of the carburetor causing it to run too rich and shaking the whole engine. I plugged the small...

Well, I ran the engine some with the air box off to see what I could see. After a couple of minutes, I noticed gas dripping and pooling up in the front of the carburetor. So I pinched off the small hose, and immediately RPM’s went up and the gas dripping and pooling went away. I also pulled the...

OK, thanks! Will do! I too am still learning, and I so appreciate the expertise here on this blog. We’re all in this together, and this is, in my book, a great forum!

Thanks guys. I did indeed notice the two small hoses, and after what you told me, I’m leery I might pinch the one with the metal restrictor inside it, not knowing which is which. I guess I could remove them and check them both over to see which is which. So would you recommend pinching it off...

I’m working on a friend‘s rider that has a CV25-69543 engine that is running rich, but still starts and accelerates fine, but it’s obvious that something’s not quite right. The manual choke operation is absolutely perfect, so it’s not a choke issue. Both spark plugs were black, so replaced both...

I’m checking out my brother’s 5-year-old Cub Cadet xt2 GX54, with a 26 hp Kohler KT745-3085 engine, due to low to mid-throttle surging that has me scratching my head. My first thought was to remove the carburetor, disassemble it and cook it in my heated ultrasonic cleaner, which I did. Once...

I would do a spark check immediately after it quits after it runs a bit. Two things fail when they get hot…..spark plugs and ignition coils. They can still run cold, but when they get hot, they will short out. So check spark when engine quits, but try a different plug(s) first.

I had an experience once where i was getting 14.5 volts out of the voltage regulator, but the battery was discharging during mowing, with only about 10.5 volts, until the battery would no longer run the electric clutch. So I traced the wire coming off the regulator and found the ignition switch...

The current administration has a goal of the total destruction of the USA from within. They will push what is bad, and extinguish what is good. And that includes replacing whatever is gas powered with electric. If it was my shop, concerning electric equipment, I would tell the customer to take...

elmrfudd Forum Newbie JoinedMay 30, 2021Threads0Messages9 Saturday at 9:15 AM / Mower no start I had a similar situation once, and found that I had lost a good ground connection where the solenoid mounts to the frame. I ran a new ground wire from the solenoid to another area of the frame, and...

I’ve worked at a couple of different repair shops over the years, both having pneumatic lift tables, and protocol for walk-behind mowers, tillers, and other smaller 4-cycle equipment was to tip it over on its side (always dipstick side down, of course). Sometimes you needed to prop the engine or...

I had a similar situation once, and found that I had lost a good ground connection where the solenoid mounts to the frame. I ran a new ground wire from the solenoid to another area of the frame, and it cranked over perfectly. So check to make sure your solenoid body itself is well grounded. You...

My dad used to reload center fire cartridges when he was alive, and he tumbled his brass with water, Palmolive dish soap and Lemi-Shine dishwasher additive, using stainless steel pins as his medium, and his brass came out clean and shiny, but always used purified water with no contaminants. I’ve...

Fortunately, I have never encountered those passages with the rubber check valves on a four cycle engine, but I use the torch cleaning wires all the time, and they are great as long as you don’t ream out the hole with a wire with too large a diameter. When I use the ultrasonic cleaner, I use...

If you have slop in your throttle shaft, the surging will likely stop when given a shot of starting fluid at the top of the shaft while running.

Another check for surging is to check for side play in your throttle shaft. Wear in that shaft or guides will cause your engine to suck additional air around the shaft, leaning it out.

I'm guessing a malfunction of the internal decompression lever/spring or improper valve clearances. Improper clearances will give a kickback effect much like hydro lock. Recheck all valve clearances at TDC. Most B&S engines can be set at .005" for intake and exhaust, but check manufacturer specs...

FIXED!!!!! I was about to throw in the towel with this one, as it seemed like converting to manual choke was a hassle and added expense. My thought was, “How do I make this thermistor get hotter, to the point it will function normally?” I had already tested the thermistor with a small flame, and...

I had this same issue with Toro belonging to a friend of mine. It appeared the muffler was not getting hot enough to turn the thermistor arm, even with the thermistor being a new one. My last resort was to drill four small holes in the top of the muffler with a 1/8” drill bit. The holes were...