Hope someone can help

[Rednec]

Then why would it run good when the blades are engaged, but not when they are off?

Don't know that this will help you but many Honda walk behind mowers have the same problem if they have a blade clutch on them. With the blades not engaged they will set there and surge constantly. Then when you engage the blades it will smooth out and run great. The reasoning is that when you put a load on the engine it will pull more fuel into the engine so therefore it smooths out. Usually you can clean the pilot jet on the carb and correct this problem. The pilot jet is so small it doesn't take but a spec of foreign material to plug it partially up and cause this problem. I hope P&K hit the nail on the head and fixed your problem. I live in MWC so not that far from you. Good luck.

 

[theoldwizard1]

Usually you can clean the pilot jet on the carb and correct this problem. The pilot jet is so small it doesn't take but a spec of foreign material to plug it partially up and cause this problem.

TRUE ! Almost all surging problems are cause by the pilot jet.

Depending on the size of the engine, you may or may NOT be able to clean it with one of the fine wires in a carburetor jet cleaner kit. If not, you need a set of #60 - #80 drill bits and a pin vice. Start small. like a #78 or #76.

I had to use a #76 on a genuine Honda GX160 just last week !

 

[Johner]

I have a new Z325E Zero turn JD mower. Bought 2 months ago. 30 hours on it. Mowing today and when I disengaged the mower blades it started surging, like moving the throttle up and down. When a load is put on it, like mowing it does not surge. I cleaned my 5 gallon gas can, went to a different gas station frilled it up, came back, disconnected fuel line from mower gas tank, installed new gas filter, put gas line into gas can a couple inches below gas level, started the mower ran it 10 minutes and it still surged. It is under warranty, so I called the dealer that would be working on it. First thing they said was bad gas. I filled up 3- 5 gallon cans 2 weeks ago and used one can and no problem till today.

Most fuel problems will vanish if you use a fuel conditioner added when you fill a new can. I do this all year long with a marine grade conditioner. A few penny's at this point will lesson the amount of aspirin needed.

 

[RevB]

Don't know that this will help you but many Honda walk behind mowers have the same problem if they have a blade clutch on them. With the blades not engaged they will set there and surge constantly. Then when you engage the blades it will smooth out and run great. The reasoning is that when you put a load on the engine it will pull more fuel into the engine so therefore it smooths out. Usually you can clean the pilot jet on the carb and correct this problem. The pilot jet is so small it doesn't take but a spec of foreign material to plug it partially up and cause this problem. I hope P&K hit the nail on the head and fixed your problem. I live in MWC so not that far from you. Good luck.

That load compensation only occurs because the governor opens the throttle plate increasing intake airflow which lowers the pressure and the atmosphere pushes more fuel thru the orifice.

 

[The Specialist]

That load compensation only occurs because the governor opens the throttle plate increasing intake airflow which lowers the pressure and the atmosphere pushes more fuel thru the orifice.

Hi. I read your problem of the surge, but with all the chatter, I don’t know if you have fixed it. When you stated that you could hear popping coming through the exhaust, your problem is that you don’t have enough clearance on your intake valve. The intake valve is staying slightly open and the fuel/air mixture is going back and fourth in the pipe between the cylinder and carb. This is common with new engines and it needs a simple adjustment. I’m guessing that you have a briggs engine. If you need instructions-reply. I’m one of the top technicians in Canada and the United Kingdom.

 

[macdoesit]

I have never used ethanol in anything. When I took it into JD it was surging and had a low volume very faint popping sound. I just mowed 2 acres of my 5 and no surging at all, but the very low volume popping has come back. Monday I will take it back to JD, unless it is a simple fix and someone can tell me how to do it, as I don't want to void the warranty. 200 hundred hours or 3 years.

 

[macdoesit]

Hi. I read your problem of the surge, but with all the chatter, I don’t know if you have fixed it. When you stated that you could hear popping coming through the exhaust, your problem is that you don’t have enough clearance on your intake valve. The intake valve is staying slightly open and the fuel/air mixture is going back and fourth in the pipe between the cylinder and carb. This is common with new engines and it needs a simple adjustment. I’m guessing that you have a briggs engine. If you need instructions-reply. I’m one of the top technicians in Canada and the United Kingdom.

Yes B&S 24hp. Instructions would be great. Thank you.

 

[The Specialist]

Yes B&S 24hp. Instructions would be great. Thank you.

 

[The Specialist]

Ok. As you have 2 cylinders, you have to do each one separately.You will need a .005 feeler gauge.Remove both spark plugs. Remove both valve covers. Remove the plastic top shroud so you can turn the flywheel by hand.Take a screw driver that is fairly long and put it in the first spark plug hole and with watching the valves rotate the engine with your hand. You will see the rocker arm push on the valves. So there are 4 strokes to an engine, which is intake, compression, power and exhaust. You want that cylinder to be between the compression and power stroke. So you will see the top valve push down, and the piston will be moving down, the the piston will start to move up, and the intake valve will close. Bring the piston to the top, and just rotate it enough that it just starts to go down. Take your feeler gauge and it should slide in between the valve and the rocker arm. If it doesn’t, loosen off the 10mm nut , while holding the 14mm rocker nut. Rotate the 14mm one just slightly counter clockwise and tighten the 10mm lock nut. Do this until the feeler gauge slides in. Do the second side. Once you have done this, put the valve covers back on, the sparks plugs back in, and for safety, I’m supposed to say put the shroud back on. But what I do is make sure that nothing is around the flywheel (wires etc) and I will test run it to make sure the valves are not clacking. If the engine sounds perfect, I put the shroud back on. Email me direct at dvata@yahoo.com if you need further help

 

[The Specialist]

Ok. As you have 2 cylinders, you have to do each one separately.You will need a .005 feeler gauge.Remove both spark plugs. Remove both valve covers. Remove the plastic top shroud so you can turn the flywheel by hand.Take a screw driver that is fairly long and put it in the first spark plug hole and with watching the valves rotate the engine with your hand. You will see the rocker arm push on the valves. So there are 4 strokes to an engine, which is intake, compression, power and exhaust. You want that cylinder to be between the compression and power stroke. So you will see the top valve push down, and the piston will be moving down, the the piston will start to move up, and the intake valve will close. Bring the piston to the top, and just rotate it enough that it just starts to go down. Take your feeler gauge and it should slide in between the valve and the rocker arm. If it doesn’t, loosen off the 10mm nut , while holding the 14mm rocker nut. Rotate the 14mm one just slightly counter clockwise and tighten the 10mm lock nut. Do this until the feeler gauge slides in. Do the second side. Once you have done this, put the valve covers back on, the sparks plugs back in, and for safety, I’m supposed to say put the shroud back on. But what I do is make sure that nothing is around the flywheel (wires etc) and I will test run it to make sure the valves are not clacking. If the engine sounds perfect, I put the shroud back on. Email me direct at dvata@yahoo.com if you need further help

You will do this with both valves at the same time