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  #1  
Old 09-29-2020, 09:02 AM
amanfrromthere amanfrromthere is offline
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Default 1864 Loss of power
I was mowing the other day and my 1864 randomly started running really rough and then died. I could barely get it to start again. Left it for a day and I was able to get it to start, but sounds like its only running on one cylinder. As soon as I try to give it any throttle, it'll just bog down. It'll move, but the engine can barely handle that regardless of throttle level.

If, when running, I pull off one of the spark plug wires, the engine will continue running with zero change. Pull the other one, engine dies immediately.

I replaced the plugs. Both appeared to be giving a spark if grounded to frame, though one side did seem to give off a stronger spark.

At this point, what's the best way to determine if it's fuel or ignition? Or is that description enough to make that determination?


Thanks
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  #2  
Old 09-29-2020, 09:49 AM
Mike McKown Mike McKown is offline
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Do you have compression in both cylinders?
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Old 09-29-2020, 09:51 AM
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Hairtrigger Hairtrigger is offline
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Fuel delivery issue?
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Old 09-29-2020, 01:23 PM
dbuck dbuck is offline
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Fuel delivery issue?
Not trying to be a smart ass. But what does a fuel delivery issue have to do with not firing on one cyl?
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Old 09-29-2020, 03:29 PM
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Not trying to be a smart ass. But what does a fuel delivery issue have to do with not firing on one cyl?
If he is low on fuel no one says that it is actually firing on that cylinder
The original post said he had spark at both plugs but one appeared to be stronger spark
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Old 09-29-2020, 04:11 PM
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Sam Mac Sam Mac is offline
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Read post #1. He said it will run on one cylinder but not the other. Classic loss of compression in one hole.
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Old 10-05-2020, 08:26 AM
Rex B Rex B is offline
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I'd bet money it's a head gasket. I have two Cubs down right now with that issue. It is the Achilles heel of that engine.

Compression testers are cheap. Buy or borrow one.
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Old 09-29-2020, 11:11 AM
amanfrromthere amanfrromthere is offline
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Do you have compression in both cylinders?
I don't have a compression tester
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Old 09-29-2020, 10:38 AM
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I encountered a similar issue on a Simplicity Conquest with a Briggs 18hp engine. In some way, the issue was being caused by a bad air filter. It ran fine without the filter, and runs fine with the new one. However the carb also has some gunk in it still, the throttle wanders until I put it under load (engage the deck). Are you certain it didn't throw one rod? Was there a "clunk" sound when it started running rough? Easiest way to check is by turning the engine over by hand and looking into the cylinder through spark plug hole. I would say fuel issues more than anything, but I can't be certain. Your engine might have a completely different issue than mine had.
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Old 09-29-2020, 12:15 PM
amanfrromthere amanfrromthere is offline
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Originally Posted by Cubcadet_107 View Post
I encountered a similar issue on a Simplicity Conquest with a Briggs 18hp engine. In some way, the issue was being caused by a bad air filter. It ran fine without the filter, and runs fine with the new one. However the carb also has some gunk in it still, the throttle wanders until I put it under load (engage the deck). Are you certain it didn't throw one rod? Was there a "clunk" sound when it started running rough? Easiest way to check is by turning the engine over by hand and looking into the cylinder through spark plug hole. I would say fuel issues more than anything, but I can't be certain. Your engine might have a completely different issue than mine had.
In addition to new plugs, I gave a full oil change and new air filter. Also new fuel filter. No change at all unfortunately.

How loud of a clunk would it have been? But I don't think so, at least nothing that I could hear over the sound of the engine/mower (and wearing ear protection). It was sudden though, not a gradual decline.

I'll try turning it by hand and see if there's anything obvious.

I'm leaning toward fuel as well, but I'm not familiar enough with symptoms of lost compression or other internal damage to rule any of those out.
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