Outdoor Power Equipment and Small Engines - YardMan Weed Wacker overheating ?

gas trimmer engine overheating?
I have a Yardman from crappy tire and the piston has seized on me twice now.After i freed it yesterday i thought i'd add extra 200 ml of oil to mixture.(40:1)Lots of oil in gas now.
Well it seized again today.
Idles smooth then after 5 mins wide open it stalls out.
Greased boom cable and can rotate at engine-boom separation with fingers.
Pulls easy with plug out,quite jerky with plug in.

Going to try running with boom separated from engine next.

What could possibly be causing this overheating ?:alarm:

You didn't tell us the model of the unit, but is the starter handle between the engine & the boom, drive unit, if so, the problem is likley caused by the crankcase leaking air & making the unit run lean.. If the piston siezed once, It"ll never be right, no matter how much oil you put in it.. Sorry,, Roger

I agree...it's done now. Time to go shopping for trimmers :(.

ok,thanks guys
No sense messin around till the grass is 2 feet high :)

Maybe I'll try Cosco or HomeDepot this time

Have a good 1 and Happy trimmin

You didn't tell us the model of the unit, but is the starter handle between the engine & the boom, drive unit, if so, the problem is likley caused by the crankcase leaking air & making the unit run lean.. If the piston siezed once, It"ll never be right, no matter how much oil you put in it.. Sorry,, Roger

It's a Yardman Y28 and yes the starter handle is between the engine and the boom.
The piston might have got scored i presume.
I'm going to check the spark arrester,I've read it can cause problems.
I've seized a homelite chainsaw once and once i got it free,it ran like a top.

Well disconnected the boom cable and the symptom is still the same.After 5 mins of running the pull cord seizes,telling me either the piston scored the cylinder wall or the needle bearing are shot or both....lol :thinker:
After 4 years of use i figure i got a deal for $100.
But 40:1 ratio using crappy tire 2 cycle oil is hard on those crappy tire crankshaft needle bearings.
Am going with an Echo Gt200RSP for $200 at HomeDepot
even thou the warranty is only 2 years.It's a rapid loader with i-30% pull reduction.
Echo recommends a 50:1 ratio i believe but the crankshaft has roller bearings not needles.
MTD has an oil out with stabilizer already in the oil and 25:1 sounds good.

Echo makes some of the better products out there, why would you spend $200 for a product from Echo and not use the oil and mixture they recommend. Just my $.02, Have a good one. Geo

I have to agree with Geogrubb. If you buy a quality trimmer, don't re-engineer it. Running it @ 25:1 fuel mix will only foul plugs, plug exhaust ports & spark arresters, leak oil from the muffler & make you smell like the pit area of a "70's dirt bike race track;) . Lots of professional saws run 40-50: 1 & last for years. If you have douts about the quality of "Crappy Tire oil, don't use it, however I will tell you I have a 295 Poulan Pro with 12 years run time on it cutting 9 Full cord of wood a year & never a problem with Canadian tire oil. (I live just west of Ottawa). ...Roger