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I have an Echo Backpack Blower PB46-LN that is leaking black oil out of the muffler, its easier to start when its cold but when its hot it difficult to start, also I dont even need to prime it to get it to start, my concern now is the leaking of black oil from the muffler when its running, what can cause this and how can i fix it?

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  • logicalg Nov 14, 2009

    Now I guess its starting fine (on second hard pull), but, white smoke comes out while running and doesnt stop, also it makes a clackering noise while its running, what might these 2 problems be from?

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This senerio is an 'over-rich' condition, most often caused by an improper fuel/oil ratio mix, and the 'exhaust screen' or 'spark arrestor' on the outlet of the muffler is plugged. Cleaning the screen may be all that is needed to correct the problem. **Make sure this screen is clean, and operate engine for at least 5 minutes before making any of the suggested adjustments below.

Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated

Overfuel or 'rich' condition
Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering:
Adjust carb mixture screws to a 'less rich' setting
*NOTE: only move mixture screws 1/8 of a turn at a time,
and try operation before any more adjustment

Posted on Nov 12, 2009

Testimonial: "Now I guess its starting fine (on second hard pull), but, white smoke comes out while running and doesnt stop, also it makes a clackering noise while its running, what might these 2 problems be from?"

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Like the motor is locked up


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hi there

pauly 46 here sounds like tank breather and carby problems ?

have you checked that the muffler and ex port are not blocked ?

have you checked that the tank breather is working, and that the fuel pump diaphram is ok - no holes or damaged / stiff , and also that the metering diaphram and needle valve are ok and are not sticking open, or the lever setting is too high or the diaphram is just too stiff and holding the needle open

either way check tank breather and carby diaphrams , and needle valve and lever and the muffler and ex port for blockage

i assume compression and spark and timming and induction system are all ok
if its still hard to start and everything checks out as good might have a air leak

only way to know is to pressure and vac test crankcases

might pay to let your local shop do this because you need some special tools

but cover the basics 1st


cheers pauly46 hope it helps

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Basics to check:
1) Spark plug - brown or dark brown - OK
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2) Muffler remove for inspection
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b) inspect cylinder wall/piston as the flywheel is slowly rotated
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