Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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Gas shooting out top of carboratore on a 20 h.p turbo twin cylinder craftsman lawn tractor , idles fine but past idle starts spitting gas

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This tells you that the carb is flooding out and needs to be rebuilt. Most likely the float in the carb has a leak and is sinking in the bowl.

Posted on May 07, 2010

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Riding mower v twin acts like its running out of gas how to check what is wrong


Does it idle normally, but only start starving of fuel under load or high revs?
If so, check the fuel filter - just a simple plastic cylinder that the fuel line runs through before going into the carburettor. Quite cheap and easy to replace.

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I have a 1998 Craftsman 19.5 HP opposed twin turbo, and it wont start without taking the right plug out, which releases compression, and then put it back in, and the cylinder will fire and run accordi


You might try putting an inline valve in the fuel line feeding the carburetor or simply clamp the line shut to see if that works.
It sounds like hydro lock due to fuel getting into the cylinder when the engine is not running, Briggs had an issue with it along with others, some (like Honda) have a solenoid in the float bowl to stop the fuel flow. If this works install the valve, shut it off and let the tractor idle a minute before shutting down the engine

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I have a craftsman LT1000 with a B S 20 hp twin motor. Recently it started backfiring after it runs for about 10 minutes. Only after it's warm it backfires. I changed the oil and filter, plugs,fuel filter...


Carb is running a tad rich and the fuel collects in the muffler. My 20 twin has done it since I bought the thing and that was almost 8 years ago.
Cut the engine idle down before you cut the key off and minimize the bang.
Someone else may give a better explanation of the why but it is just annoying and personally after rebuilding the carb and checking the fuel pump on mine it still does it on occasion. Hasn't hurt a thing on in all these years and I actually thing it blows the soot out of the muffler when it does.

Jun 09, 2010 | Craftsman 20 hp 42 in. Deck Lawn Tractor -...

1 Answer

Idles fine, shuts down when release brake.


It could be the brake switch bad, if this model came with one. When it is depressed it will start, but when it is released it may not be switching to stay running.

Mar 27, 2010 | Craftsman 20 Hp 42" Deck Lawn Tractor

1 Answer

Lawn tractor, engine model 42A707, starter spins but won't start engine; noted starter gear on top is worn down. Need help to either replace whole starter assembly with gear or just gear?


I had this same problem with a twin cylinder B & S engine and was able to get just the gear drive replaced without replacing the whole starter. Hope this helps you

Nov 10, 2009 | Craftsman 20 Hp 42" Deck Lawn Tractor

1 Answer

I have a Craftsman lawn tractor 21.5 hp, model no. 917.272463. The engine starts well, but while running it spits and sputters every second or so, whether at idle or at full throttle. I changed the fuel...


Try changing the its oil-seals. The problem lies there. It may be damaged or the oil-seals are now smaller than its is used to and it is because of the heat. The oil-seal are rounded things that are made of rubber.

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1 Answer

1990 eclipse gs turbo starts & idles wont go past 2500rpms


you have a boostleak, i build gsx's my roommate owns 4g63 power, give me your email er cell and i will send you a boost leak detector you hook up to the turbo inlet and shoot pressurized air into it and if you have a boostleak it will leak out of the engine somewhere that is your leak you replace the seal or hose and blauw the car is fixed, hook me up with blue feedback since im going this far out of my way. the reason you cant get past 2500rpm is because unmeetered air is being let in post maf sensor and the ecu is trying to richen up the engine which is causing the black smoke and probably a strong smell of fuel. my current dsm is the 9th one ive owned =) they break alot lol easy fix though.

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