MossRoad
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- Power Trac PT425 2001 Model Year
No, there is no fuel shutoff on my tractor which is a 2001 PT425 with the Kohler engine.
422 Robin eng...problems AGAIN.
- Thread starter ldabe
- Start date
- Views: 7528
No, there is no fuel shutoff on my tractor which is a 2001 PT425 with the Kohler engine.
Idabe I hope I'm way off but this sounds quite a bit like my gas in my crankcase issue. I got quite a bit of whitish smoke and she died. Have you checked your oil level? See http://www.tractorbynet.com/forums/power-trac/149992-2-part-gas-1-part.html. You might take a sniff of the towell you clean the dipstick on too just to be on the safe side.
J_J
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David,
Some of the Kohler's I looked at had a solenoid fuel shut-off at the carb, All my vertical Kohler 25 HP engines have this feature.
Gravy
Platinum Member
Most fuel shutoff solenoids on carbs only shut off fuel to the main jet. They have no effect whatsoever on the float valve. They mostly exist to minimize dieseling/run-on after turning off the ignition.
J_J
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I agree partly.
Maybe I am wrong here, but my thinking is that a carb with no fuel shutoff in the carb, and float hanging open, will let fuel up through the main jet and settle in the crankcase. With a solenoid in the carb, and closing off the main jet, even if the float was sticking, the fuel might only run out the bowl to the outside. Don't know for sure. I am also thinking this only happens when a tank is located at a level above the carb. One could easily set up a test to verify this.
hogi
Bronze Member
I posted a thread not too long ago about a flooded crankcase. My 2005 PT425 w/Robin engine has a fuel shutoff solenoid on the carb and it does not prevent flooding of the crankcase. I have installed an in-line shut-off to get by, but its hardly an ideal situation. It's easy to forget in the rush to get a project done, and just a pain to have to pop the cover and manually shut off the fuel for any time you want to stop 1/2 hour or more. My PT starts w/out needing to be choked, and runs rich all the time. I definitely think the shut-off is needed and Robin calls for it when the fuel tank is mounted above the carb, as with the PT 425. I think I will have to clean out my float valve to get my engine running right again.
woodlandfarms
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What about this for the Robins users?
http://www.snydersantiqueauto.com/4008
Wire it to the key.....
http://www.snydersantiqueauto.com/4008
Wire it to the key.....
Mine has always seemed to run rich! It seemed like it when I first bought it (used) and then also after a new carb replaced the old.
Once again, I have to say I am not impressed with Robin engines. This is the first I have ever had, and will be the last unless I just can't get around it.
Once again, I have to say I am not impressed with Robin engines. This is the first I have ever had, and will be the last unless I just can't get around it.
Anyone know off hand what the gap is suppose to be on the plug for the Robin 422?
Just got two new ones. The old ones (I say old, but they were new at the beginning of summer) were black with "soot". So much, I almost called a Chimney Sweep!
From Robin site: "If the smoke is black in color, it typically indicates that the mixture is too rich. Incorrect mixtures of air and fuel cause the majority of carburetor problems; therefore, it is important to prevent clogged jets, air passages and fuel passages that keep air and fuel from flowing freely. Check the carburetor for dirty or defective parts and clean or replace them if needed. A change in elevation also may cause black smoke, in which case the engine should be modified to handle the difference. If basic troubleshooting maintenance techniques fail to work, have a trained mechanic conduct a leakdown test or compression test to determine the cause for any smoking or power reduction."
http://209.62.29.198/articles.aspx?t=e&id=34
Just got two new ones. The old ones (I say old, but they were new at the beginning of summer) were black with "soot". So much, I almost called a Chimney Sweep!
From Robin site: "If the smoke is black in color, it typically indicates that the mixture is too rich. Incorrect mixtures of air and fuel cause the majority of carburetor problems; therefore, it is important to prevent clogged jets, air passages and fuel passages that keep air and fuel from flowing freely. Check the carburetor for dirty or defective parts and clean or replace them if needed. A change in elevation also may cause black smoke, in which case the engine should be modified to handle the difference. If basic troubleshooting maintenance techniques fail to work, have a trained mechanic conduct a leakdown test or compression test to determine the cause for any smoking or power reduction."
http://209.62.29.198/articles.aspx?t=e&id=34
Last edited:
Gravy
Platinum Member
Yes, there are a lot of details of carb design that come into play. Some will overflow to the outside and not flood the engine, while some have a bowl vent that will dump right down the throat. I just wanted to point out that most solenoids do not cut off the fuel supply to the whole carb.