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Old 01-23-2013, 09:02 PM   #1
outerextreme
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Default EC25DS backfires thru exhaust

I have an ez-go 3 wheel golf cart that I am working on for a friend. It has a Robin EC25DS, 2 stroke engine. I don't know what year it is. loking at it, it is an older one. The problem is it backfires out the exhaust. I changed the plug and it ran but poped farted and wouldn't rev. the carb is clean. I pulled the plug back out and it was covered with carbon soot. It smokes enough to burn my eyes. I checked the compression and it has about 125psi cold. Any ideas where I should look?
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Old 01-24-2013, 06:30 PM   #2
rvkersh
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Default Re: EC25DS backfires thru exhaust

what is the fuel mix? 125 compression is good. there should be a tag under the right side of the dash that will give a year, last 2 digits of the manufacture code. Need to determine if it has point or cdi ignition.
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Old 01-24-2013, 09:04 PM   #3
outerextreme
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Default Re: EC25DS backfires thru exhaust

not sure of the fuel mix. it had almost a full tank when it was dropped off. the tag under the dash has 2 sets of numbers on it. The first set of numbers is 780 28 and the second set of numbers is I54I59
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Old 01-24-2013, 09:37 PM   #4
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The mix should be 128:1. (1oz oil/1gal gas). From the numbers it looks to be a 78.

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Old 01-25-2013, 03:43 AM   #5
rvkersh
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Default Re: EC25DS backfires thru exhaust

That machine would have points behind the flywheel. If it is back firing all of the time I would check the points and condenser, if it only back fires when you let off the accelerator then step back on then the throttle cable is out of adjustment or the cable spring is broken or missing.
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Old 01-25-2013, 05:37 AM   #6
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I wouldn't mess with the points or condenser. My 79 still has both originals in it. I think your throttle cable is out of adjustment. Read this this. It will help you a lot. http://www.buggiesgonewild.com/showthread.php?p=734480

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Old 01-25-2013, 05:15 PM   #7
rvkersh
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Default Re: EC25DS backfires thru exhaust

In that view the spring is in the wrong place, it belongs over the throttle cable tube at the bracket, the cable ball belongs against the throttle toggle. This makes the housing adjustment continuous. A condenser can fail at any time on any machine causing misfires and back fires.
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