038 smoke machine

[Lumptastic]

Ok so I’ve got an 038 super was running fine shut it off and almost immediately after I started it back up was running like crap and smoking like crazy. Didn’t add fuel so there no possible way there was anything different from when I ran it 20 minutes prior to that. My only guess is that the case gasket is letting it suck bar oil into the bottom end. Is that anyone else has had happen or even heard of? It’s the only logical explanation I can come up with that could cause it to start smoking out of the exhaust like that

 

[Old2stroke]

Sounds like it might just be running too rich on fuel. Before blaming a case gasket, check the carb, could just be an inlet valve that is not seating properly. Pressure test the carb, then the crankcase.

 

[ZeroJunk]

Yeah, stuck needle valve maybe. Time for a carb kit. Sometimes the diaphragm gets stiff and just lays on the needle.

 

[HarleyT]

Drain the oil tank and rinse it out. Then run the saw a little with the bar/chain off. See if it stops smoking.

 

[bigbadbob]

Yeah, stuck needle valve maybe. Time for a carb kit. Sometimes the diaphragm gets stiff and just lays on the needle.

Just had that happen,, 038 mag.
Kit fixed it.
Would run and slowly flood itself out after a few smokey cuts.

 

[Ironhorsedoctor]

I agree with HarleyT! I had the same issue with a 034 and found the case gasket protruding out inside the oil reservoir.
Upon disassembly I found one case screw loose at the same location of the ruptured case gasket. If you do drain and flush
don’t run the saw with the oil cap off. You’ll run lean if the gasket is ruptured!

 

[Joe Crow]

Drain the oil tank and rinse it out. Then run the saw a little with the bar/chain off. See if it stops smoking.

Rinse it out with gas?

 

[stihltech]

Rinse it out with gas?

Quickest way. Drain it before running though. There will still be enough oil in the pump to run it long enough to see if it stops smoking.

 

[Old2stroke]

When the fault occurs so quickly, it's not likely a case seal, it would gradually appear and get worse slowly, but flushing out the tank is a quick and easy test. When a saw shows signs of flooding after sitting for a short time, it's often because the increasing tank pressure due to heat soak has exceeded the pop-off pressure of the carb. Easy test is to loosen the fuel cap when the saw is sitting and see if the flooding stops.