I have a 7 HP Duromax engine with electric start. I've replaced exhaust, air filter, and jetted carb, but after riding the go-kart for a bit (30 minutes or so) the engine will shut off. After it sits for a few seconds to a minute it will fire back up and run for another few minutes and then do the same thing again. I've tried 2 different jets, changed the emulsion tube, changed the low speed jet, but nothing seems to fix the issue. I haven't modified the gas tank/cap so it shouldn't be vapor lock, but I am not sure what the issue is. my next thought was maybe the coil was getting to hot, but if that was the case I don't know why it would fire back up after a few seconds/minutes. Any ideas?
Duromax Dies after Riding for 30 Minutes or so
- Thread starter MrGentry
- Start date
Rat
Well-known member
^ This
Also it could be a faulty ignition coil. I've seen it time and time again where a failing coil will run fine until the heat soak geats at it. Not sure why it's an issue, but I know it is a common one on everything from motorcycles to lawnmowers. I salvaged a 70's QT50 with the same issue, and made a quick 200 off a guy that couldn't keep his Polaris 550 running
I left the sensor in the block, but I disconnected it.
How can I determine it is the coil that's at fault?
Rat
Well-known member
The easiest most guaranteed method is getting a replacement coil.
If it fixes the issue Great, if it doesn't well then they're cheap enough it's not a big loss and now you have a spare and an issue to track down.
The only other thing I can think of is a bad seal or something cracked that allows a leak only when hot... seen that one thousands of times but mostly only on 2t engines
Denny
Canned Monster
Make sure you don’t have a sticky needle and seat or a float.
pearl111
Well-known member
Also make sure the gas tank is vented.
Any recommendations for a good coil?