john deere 3020 sputters

JD2ACWD · May 14, 2019

my 3020 gasser sputters under load its fine for about 30 minutes then it sputters bad ,i shut it off for awhile then its fine again,its not over heating,any ideas?

Steve@Advance · May 14, 2019

Could be weak spark. Check spark at the plugs when it's acting up. It should be able to jump 1/4" minimum from each plug wire to ground. Check the point gap, distributor shaft for side play. Feel the coil, it should not be noticeably hotter than the surrounding metal.

Could be fuel starvation. Try loosening the cap. Check the fuel flow through the carb. With the engine off, fuel valve on, have a clean glass ready to catch the flow. Remove the carb drain plug, watch the flow. It should have a full stream, then slow to a trickle. If it stops or slows to a drip, there is a restriction. Could be in the tank, the sediment screen, the screen in the fuel inlet elbow of the carb. If any inline filters have been added, they could be restricting the flow.

Look at what was caught. If cloudy or water in the bottom, dirt, rust, the tank is contaminated and needs to be taken off and rinsed with E85.

Whatever is in the glass will also be in the carb. It may need to have the bowl eased off and cleaned.

Could be vapor lock. Be sure the fuel line is routed away from the exhaust.

Bob · May 14, 2019

(quoted from post at 14:34:18 05/14/19) my 3020 gasser sputters under load its fine for about 30 minutes then it sputters bad ,i shut it off for awhile then its fine again,its not over heating,any ideas?

As Steve said, check the spark cold vs. when it's acting up.

Use tester with an adjustable gap, and note if the distance the spark will jump is less when it's acting up.

Both coils ans condensers can be "thermal" and act up when warm, causing weak spark.

john deere 3020 sputters

JD2ACWD

Member

Steve@Advance

Well-known Member

Bob

Well-known Member

Similar threads