TG1860G weird engine running

GreensvilleJay

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BX23-S,57 A-C D-14,58 A-C D-14, 57 A-C D-14,tiller,cults,Millcreek 25G spreader,
Apr 2, 2019
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needle nose pliers, bend it open to make about a 50 though gap
if that IS the way it was, engine only running on 1 cylinder ! maybe a pop or two from the left, MAYBE
 
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Donystoy

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LX2610HSDCC, B/H, Loader, plus numerous other attachments. B7200 sold
Dec 10, 2013
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Just checked right now! You might be right. View attachment 145131
This could be an issue I oversighted. Is there a way to fix the bend?
Wow! That certainly has to be your problem. That happens when it is dropped on the floor. There is a tool for straightening these, but pliers will also work. You should use a gauge to set these at the correct gap.
 
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FiveOrangesH14

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Kubota T1880A2, Kubota TG1860G
Dec 26, 2024
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Wow! That certainly has to be your problem. That happens when it is dropped on the floor. There is a tool for straightening these, but pliers will also work. You should use a gauge to set these at the correct gap.
I fixed the bend and used my feeler gauge to bend them to spec. Fixed much of the idle uncertainty but I still am missing 1000 RPM that it usually has at high idle.
 

Donystoy

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I fixed the bend and used my feeler gauge to bend them to spec. Fixed much of the idle uncertainty but I still am missing 1000 RPM that it usually has at high idle.
Maybe you should start with putting the original carb back on. Not sure if carb overhaul kits are available for these but I would prefer installing one of them first on the original carb
 

FiveOrangesH14

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Kubota T1880A2, Kubota TG1860G
Dec 26, 2024
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Maybe you should start with putting the original carb back on. Not sure if carb overhaul kits are available for these but I would prefer installing one of them first on the original carb
I have the original Mikuni carb back on already. Probably gonna try and see why it may limit the engine. I hope it’s not governor related.
 

Russell King

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… I’m only 14 so I am not the most knowledgable for this stuff!
Good on you having the interest in getting mechanical equipment working.

At your age you probably have limited experience in carburetor repair and it is fairly easy to screw something up in the process. I believe you said it runs better with the Chinese carburetor than the rebuilt one. You might just use that carburetor and live with the limited upper RPM. Then take the original carburetor to a small shop and ask an experienced repair person to help you rebuild it. At your age most people will be happy to provide you some assistance if you act respectable and not like you know more than they do. They may just tell you to watch them do it since it might be faster that way.

I recommend that you REPLACE the spark plugs with new ones that are the same brand (NGK) and the proper part number for the engine. The reason is that you don’t know what damaged that plug (I assume) so can’t be sure that it is not damaged in ways that are not obvious. They are relatively inexpensive (but maybe not to a young person) and may still be part of the problem. If there is a crack in the ceramic insulation that could be causing the plug to misfire at times. Replacing them eliminates any suspicion of a bad plug.
 
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lugbolt

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I think those plugs are wrong. Those are long reach plugs and IIRC these engines require the shorter reach plugs. If you're using the long plugs in there where the short plug should be, the pistons will smack the ground strap and close the gap up exactly as I saw in the picture. I have done this in the past.

Isn't that an FD590V engine? I'm 90% positive that those all used the BMR4A (or BMR2A) spark plugs which are half the reach/length of the BPR*ES plugs that I saw in the pics. But that leaves 10% chance of me being wrong....
 

FiveOrangesH14

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Kubota T1880A2, Kubota TG1860G
Dec 26, 2024
36
1
8
Vancouver Washington
I think those plugs are wrong. Those are long reach plugs and IIRC these engines require the shorter reach plugs. If you're using the long plugs in there where the short plug should be, the pistons will smack the ground strap and close the gap up exactly as I saw in the picture. I have done this in the past.

Isn't that an FD590V engine? I'm 90% positive that those all used the BMR4A (or BMR2A) spark plugs which are half the reach/length of the BPR*ES plugs that I saw in the pics. But that leaves 10% chance of me being wrong....
I wouldn't deny your idea since I didn't drop the plugs for sure. But when I check the Kawasaki FD590V specifications, it claims its the NGK BPR4ES.
1735614136541.png
 

FiveOrangesH14

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Kubota T1880A2, Kubota TG1860G
Dec 26, 2024
36
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Vancouver Washington
Good on you having the interest in getting mechanical equipment working.

At your age you probably have limited experience in carburetor repair and it is fairly easy to screw something up in the process. I believe you said it runs better with the Chinese carburetor than the rebuilt one. You might just use that carburetor and live with the limited upper RPM. Then take the original carburetor to a small shop and ask an experienced repair person to help you rebuild it. At your age most people will be happy to provide you some assistance if you act respectable and not like you know more than they do. They may just tell you to watch them do it since it might be faster that way.

I recommend that you REPLACE the spark plugs with new ones that are the same brand (NGK) and the proper part number for the engine. The reason is that you don’t know what damaged that plug (I assume) so can’t be sure that it is not damaged in ways that are not obvious. They are relatively inexpensive (but maybe not to a young person) and may still be part of the problem. If there is a crack in the ceramic insulation that could be causing the plug to misfire at times. Replacing them eliminates any suspicion of a bad plug.
Once I scrape up enough money to get new spark plugs, I will. I also don't know which oil filter to put on this since it has 6 year old oil in it and I can't find any of the oil filters that aren't just the OEM filter. Is there a known aftermarket filter from any big store brand (ie. Walmart or Autozone or O'Reilly) that holds a filter alike?
 

Donystoy

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Dec 10, 2013
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Once I scrape up enough money to get new spark plugs, I will. I also don't know which oil filter to put on this since it has 6 year old oil in it and I can't find any of the oil filters that aren't just the OEM filter. Is there a known aftermarket filter from any big store brand (ie. Walmart or Autozone or O'Reilly) that holds a filter alike?
Mine uses a John Deere oil filter AM107423. You can do a google search for filter substitutions for brands available to you. I have used I believe a Fram PH4967 in the past. If unsure you could take your original with you when shopping. Amazon has filters as well. These were overall great engines. One beef I have is having to remove hoses to replace the antifreeze.
 

rudder35

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MX4800, G1800
May 22, 2023
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ac3510!??
Once I scrape up enough money to get new spark plugs, I will. I also don't know which oil filter to put on this since it has 6 year old oil in it and I can't find any of the oil filters that aren't just the OEM filter. Is there a known aftermarket filter from any big store brand (ie. Walmart or Autozone or O'Reilly) that holds a filter alike?
You are doing great for being just 14! Here is a listing of oil filters.

Make an Amazon wish list and I will send you plugs and oil filters and whatever else you need.
 
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FiveOrangesH14

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Kubota T1880A2, Kubota TG1860G
Dec 26, 2024
36
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I think those plugs are wrong. Those are long reach plugs and IIRC these engines require the shorter reach plugs. If you're using the long plugs in there where the short plug should be, the pistons will smack the ground strap and close the gap up exactly as I saw in the picture. I have done this in the past.

Isn't that an FD590V engine? I'm 90% positive that those all used the BMR4A (or BMR2A) spark plugs which are half the reach/length of the BPR*ES plugs that I saw in the pics. But that leaves 10% chance of me being wrong....
Decided to take the spark plug confusion to the parts diagrams and I got that it’s a BPMR6A or something like that. I bought them and they seem to work fine. I do have a vacuum leak right now though because I broke the intake pipe boot to the carb, but that’s already on the way.
 

FiveOrangesH14

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Kubota T1880A2, Kubota TG1860G
Dec 26, 2024
36
1
8
Vancouver Washington
Decided to take the spark plug confusion to the parts diagrams and I got that it’s a BPMR6A or something like that. I bought them and they seem to work fine. I do have a vacuum leak right now though because I broke the intake pipe boot to the carb, but that’s already on the way.
Update: Finally got around to installing what I needed. The new intake pipe seems to fix the very little response engine and a governor spring that I stole from my other TG1860G shows for proper RPM so the governor spring must've been bad or something an I had not noticed the RPM difference beforehand. The engine runs pretty clean now until the valve cover gasket started leaking oil on the exhaust and then the coolant hose popped off and caused a smoke fest under the engine, but thats an issue that are easy to fix. Thanks to all who had helped me out!