Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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The first thing that I would try is to adjust the high side carburetor screw out about an 1/8 of a turn which should solve your issue. These carburetors come preset from the factory but are not always exact for every machine and do require a slight adjustment once installed onto your machine. Depending on the carburetor some of the adjustment screws are easily accessible and others you will have to remove a cap or plug before you can get to the screw.
If you can provide the brand and numbers from the carburetor for me I can assist you with the location of the screws.
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I am including a diagram of the carburetor. Take notice of reference numbers 3 and 4. Number 4 is a cap or cover that must be removed in order to get to number 3 which is your adjusting screw.
Forgot to include the diagram, here it is.
Most of the time you can use a small flat tip screwdriver and just pop it out.
Does it die when you pull the throttle or just not come up to full rpm?
It really sounds like you still have a fuel restriction that just isn't allowing enough fuel to pass through the carburetor in order to keep the machine running at full throttle.
One other thought however would be to check the exhaust screen in the muffler if you haven't already.
Maybe the pulse hole between the cylinder and the carburetor is blocked which would explain the no fuel problem. You might even check the gasket between the carburetor and isolator flange and the flange and cylinder to make certain that the holes all line up in them.
Yes, if there happens to be a blockage in that pulse passage it will cause the diaphragms in the carburetor to not operate which in turn will cause no fuel to pass through the carburetor.
Let me know if you need additional assistance with this issue.
I will be watching for your response.
You indicated that you have replaced the fuel lines with new grommet and filter. Did you also replace the white tank vent that goes on the outside which is attached to one of the lines?
Let's try removing it and running the machine to see what happens. Since it seems like the machine is loosing fuel and you have done everything else my thought is that it could not be venting properly into the fuel tank which would cause a vacuum inside the tank and no fuel could be sucked out of the tank.
No problem, just let me know what you find.
So, it still runs about 10 minutes and dies and the plug is dry when trying to restart the machine. It has to be something fuel system related since the plug is dry but everything that you have done up to know should have corrected the problem. I have no other suggestions for you. I am going to opt out of your question which will allow for one of the other experts here to comment on it if anyone has something else to offer you. Thanks