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ebinmaine

Anything specific or different to know about cleaning a 2 cycle fuel system?

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I've learned a lot in the last couple years thanks to all of you and one of the next things I need to educate myself on is cleaning and replacing lines and filters on a McCulloch trimmer.

The symptom and reason that I am doing this is that it will only run on half choke. Open the choke all the way and it dies almost instantly. That would tell me that I have issues in the fuel system, I suppose.

 

is there any particular thing or part or whatever that I need to pay particular attention to?

 

 

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With out knowing your particular engine I'll give it a shot.

A lot of small 2cycle engines will have a diaphragm pump inside the carburetor. Over time these dry out & can cause the symptoms that you are having. So I would find a rebuild kit for it .

 

Pay close attention to the adjustment screw settings on the carb when you disassemble it. You'll want to get these back to the factory settings. A slightly rich fuel mixture is much better than a lean mixture when it comes to a 2 cycle. A lean mixture will burn them up in a hurry.   

 

Other than that cleanliness is king.

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Whatever you do , don't dilute a ( guessing 40:1 ) mix with Seafoam or some other snake oil crap in an attempt to clean the carb..

Achto gives good advice in paying attention to the high / low speed Idle settings if so equipped .

Take a pic of the screws then turn them in one at a time counting the revolutions until lightly seated then write down how many for screw "A" / "B" etc .

Other than that , take some more pics ( if it's your first time ) , lay some newspaper out and DIG IN .

Let's see a pic and watch for serial numbers on the carb . Many times these can be had on E-bay for under 20 beaver pelts .

Sometimes it's just better and more economical to replace than rebuild .

 

Other advice which I have ...

The air filter should be rinsed with kerosene or some mild solvent then re-oiled and patted dry .

Fog the motor in the fall and empty the tank .

Buy the premixed fuel from Home Depot or wherever .

If not use Non E fuel and a name brand oil .

An ounce of prevention is worth a pound of cure and I'm not just saying that .

When I bought my house in '96 I bought the same Ryobi trimmer I'm using today .

 

 

 

 

Edited by Digger 66
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20 minutes ago, Digger 66 said:

Fog the motor in the fall and empty the tank .

Buy the premixed fuel from Home Depot or wherever .

If not use Non E fuel and a name brand oil

Thank you both.

What does it mean to "fog the engine" ?

I've heard the term...

 

I  ONLY use non ethanol gas in all my tractor and small engines.

 

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Fog it means to remove the air filter and run her wide open while spraying fogging oil into the venturi until she dies .

Stabil fogging oil can be found at Wal Mart in the engine oil / fuel cleaner section .

Then clean or replace the sparkplug in the spring .

https://www.walmart.com/ip/STA-BIL-22001-Fogging-Oil-Cylinder-Protector-12-oz/41241735?wmlspartner=wlpa&selectedSellerId=1122&adid=22222222227028832777&wl0=&wl1=g&wl2=c&wl3=61671408129&wl4=pla-97838191449&wl5=9005556&wl6=&wl7=&wl8=&wl9=pla&wl10=101593696&wl11=online&wl12=41241735&wl13=&veh=sem&gclid=CjwKCAjwlejcBRAdEiwAAbj6Kd-tdX_SWi-7124MZDndBoO_umrRpJfH8gTQNjaHn9ei6pl0b_n7ExoCmBIQAvD_BwE

Edited by Digger 66

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I'm still running this relic of a chainsaw my Dad gave me :handgestures-thumbupright:

 

s1SEy0V.jpg

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Have you tried a shot of carb cleaner?

 

Also run them out of gas before you store for the winter...any residual in the carb will gunk up with the oil mix...

 

I always disconnect the line and run 2 strokes dry for storage over winter...

 

:twocents-02cents:

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Geez you guys are getting awful technical.....I usually just wind them out till something snaps and ....go buy a new one?

Just kidding..... I have been using the fuel in a can in the 2 strokes. Shelf life is ungodly and really does help with overwinter starts. No need to drain.

If I know I am going to go thru a full tank in a use I just run hi test with the appropriate amount of oil mixed. Just to cut down on the expense of the canned. With the canned stuff you wonder does this crap even have any oil in it? No problems so far. 

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6 hours ago, SylvanLakeWH said:

Have you tried a shot of carb cleaner?

No but it's time for a tune-up anyways.

It's been several years since this machine has been tuned right.

Fuel filter is at the end of the tube so I'll just replace it all.

 

I do normally run the fuel to stall out from all my small engines but this one sat with gas in it all winter.

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Anyone ever heard of auto trans fluid as a fuel system cleaner?  My auto shop teacher taught me that.  A quart in the gas tank of a vehicle, or a couple cap fulls in the intake, or 2:1 replacement of 2 stroke oil in a gas/oil mix.  I’ve done it for nearly 20 years and haven’t ever had an issue.  Trans fluid is super rich in detergents and still lubes well.

Edited by pullstart
Auto correct...

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Back in the days when engine oil wasn't capable of holding dirt like it does now I'd seen a few sets of heads all gunked up from lack of maintenance.

I've not personally done it but have heard of using atf as an oil flush cleaner.

 

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10 hours ago, pullstart said:

Anyone ever heard of auto trans fluid as a fuel system cleaner?  My auto shop teacher taught me that.  A quart in the gas tank of a vehicle, or a couple cap fulls in the intake, or 2:1 replacement of 2 stroke oil in a gas/oil mix.  I’ve done it for nearly 20 years and haven’t ever had an issue.  Trans fluid is super rich in detergents and still lubes well.

Ever really think what Marvel Mystery Oil really is? http://www.marvelmysteryoil.com/

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