Author Topic: Efco 181 Piston scored  (Read 853 times)

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Offline farmboy

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Efco 181 Piston scored
« on: September 07, 2013, 07:32:54 am »
Pulled down my 181 to trim tabs on carb.  Decided to pull cyl for a 7200 to 8200 conversion I had planned on doing.  I picked up a NOS 980 P&C kit a while back to go in it's place.  181 has decomp valve 980 doesn't.  WTH piston was lightly scored on ex. (it will cleanup very easily).  36 to1  Husky XP oil premium nonE gas and pig rich 11,200 by tach (13,500 is max rated rpm) 1 tank fuel through it.  What would cause this?  This is a New saw.  Plenty of oil on piston, crankcase, etc.  Fuel was less than a week old from gas station.   
Shep

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Offline Cut4fun .

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Re: 181 Piston scored
« Reply #1 on: September 07, 2013, 01:03:43 pm »
WAG    Maybe some flashing left in the exhaust port. 

Does it have any air leak symptoms when rolled side to side and bar up and  down etc?
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Offline EHP

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Re: 181 Piston scored
« Reply #2 on: September 07, 2013, 01:33:06 pm »
 ext side normally means heat , can be by lean or to much ethanol in the gas which causes it to be lean , it could also mean that the piston is growing at a faster rate than the cylinder , I know most are going to say them it should have 4 corner seizer on the piston but if its just a touch to tight then the ext side gets it first

Offline Cut4fun .

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Re: Efco 181 Piston scored
« Reply #3 on: September 07, 2013, 01:40:54 pm »
;D

You thought 181 husky didnt you ed............
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Offline EHP

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Re: Efco 181 Piston scored
« Reply #4 on: September 07, 2013, 01:42:56 pm »
yes as I didnot look up at where it was posted just at the bottom of the page

Offline Cut4fun .

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Re: Efco 181 Piston scored
« Reply #5 on: September 07, 2013, 01:49:06 pm »
I did it too.  I added efco to his title.
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Offline farmboy

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Re: Efco 181 Piston scored
« Reply #6 on: September 07, 2013, 09:59:16 pm »
WAG    Maybe some flashing left in the exhaust port. 

Does it have any air leak symptoms when rolled side to side and bar up and  down etc?
No it was running fine.
I did it too.  I added efco to his title.
Thanks will add brand from now on.
Non ethanol premium gas.  Looking @ the piston top there was one little ding looking spot in the carbon on the off side of the score.  Could have been piece of slag don't know.  Does Gilhardoni make Efco cylinders?  The 4-5 I've looked @ were very nice looked like some Gihl cyl's I've had.
My thought was running hot from being pig rich @ 11,200??  Kid that was running it was probably leaning on it hard.  I wasn't there so don't know just know the kid.
Shep

Offline EHP

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Re: Efco 181 Piston scored
« Reply #7 on: September 07, 2013, 11:15:23 pm »
if the saw was pushed on real hard or was real dull it will get very hot even if its set real rich cause as it heats up it becomes not so rich any more , When I'm blocking 4 foot stuff or bigger I set my saw very rich and yes in the first block its rich but by the second block U/m very close to being right on the money but I can still lean burn the motor if I keep pushing hard on it and that even can happen on a big saw , heat in the motor controls how much fuel the saw needs to keep running

Offline 660magnum

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Re: Efco 181 Piston scored
« Reply #8 on: September 07, 2013, 11:31:21 pm »
I've observed this too listening to saws in big cuts
We should share what we know... someone may learn...
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Offline EHP

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Re: Efco 181 Piston scored
« Reply #9 on: September 08, 2013, 04:25:37 pm »
you would not believe the number of 660 stihl I see here blew up from heat , they set the saw with a 20 inch on it then put a 36 inch bar on it and donot set the saw richer , they blow up real good  ;D

 

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