1LikesUh Oh...
01-05-2021, 07:56 PM
#1
Tech Apprentice
Thread Starter
Uh Oh...
Need some help... so I opened my zenoah g320rc engine to put a new piston ring, and I decided to clean the carbon off my piston top, so I grabbed some 500 grit sandpaper, soaked it in some 2 stroke oil, put some oil on the top of the piston and decided to go at it, after that I noticed this...
I hope it’s alright.
I hope it’s alright.
01-06-2021, 11:39 AM
#2
...........
Last edited by the rc guy; 01-12-2021 at 05:03 AM.
01-06-2021, 11:58 AM
#3
Tech Apprentice
Thread Starter
Originally Posted by the rc guy
the scoring you did when u use 500 grit is ok. Id be more concerned about the 2 carbon impurities in piston to...
01-06-2021, 12:22 PM
#4
What oil do you use?
Personally i run Castor 927 at 28:1 in a stock engine, and 32:1 in my OBR. Very clean burning oil
Personally i run Castor 927 at 28:1 in a stock engine, and 32:1 in my OBR. Very clean burning oil
01-06-2021, 12:28 PM
#5
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Last edited by the rc guy; 01-12-2021 at 05:03 AM.
01-06-2021, 01:03 PM
#6
Tech Apprentice
Thread Starter
Originally Posted by gavsta72
What oil do you use?
Personally i run Castor 927 at 28:1 in a stock engine, and 32:1 in my OBR. Very clean burning oil
Personally i run Castor 927 at 28:1 in a stock engine, and 32:1 in my OBR. Very clean burning oil
01-06-2021, 01:04 PM
#7
Tech Apprentice
Thread Starter
Originally Posted by the rc guy
so do you think this was via oil or your doing?. I think this was a manufacturing defect when aluminum was made... this looks fine id replace that piston but I don't run fossil fuel stuff only full sized things. seen spark plug damage look way worse ran for years after then seen les blow.you make call
01-06-2021, 01:09 PM
#8
Tech Apprentice
Thread Starter
Originally Posted by gavsta72
What oil do you use?
Personally i run Castor 927 at 28:1 in a stock engine, and 32:1 in my OBR. Very clean burning oil
Personally i run Castor 927 at 28:1 in a stock engine, and 32:1 in my OBR. Very clean burning oil
01-06-2021, 02:37 PM
#9
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Last edited by the rc guy; 01-12-2021 at 05:02 AM.
01-06-2021, 02:50 PM
#10
Tech Apprentice
Thread Starter
Originally Posted by the rc guy
with that defect in cylinder head you'll always get carbon build up..
01-06-2021, 11:33 PM
#11
Tech Adept
100% This is nothing to worry about, like at all... Think about it for a sec, what could those minor sand marks do to mess up fuel/air flow. As long as there are no finger nail deep scratches in the cylinder wall or big chips taken from piston edges there is nothing to impede fuel/air movement or lower compression. Run it and enjoy the fact you just saved by extending the life of your motor.
In the future, a little brake cleaner and microfiber cloth should be able to remove any carbon build up.
In the future, a little brake cleaner and microfiber cloth should be able to remove any carbon build up.
01-06-2021, 11:38 PM
#12
Tech Apprentice
Thread Starter
Originally Posted by Lone Racer
100% This is nothing to worry about, like at all... Think about it for a sec, what could those minor sand marks do to mess up fuel/air flow. As long as there are no finger nail deep scratches in the cylinder wall or big chips taken from piston edges there is nothing to impede fuel/air movement or lower compression. Run it and enjoy the fact you just saved by extending the life of your motor.
In the future, a little brake cleaner and microfiber cloth should be able to remove any carbon build up.
In the future, a little brake cleaner and microfiber cloth should be able to remove any carbon build up.
01-06-2021, 11:57 PM
#13
Tech Adept
Just make sure the ring is on correctly. The two ends should meet and sit on that little pin/knub in the piston collar (or whatever it's called). The arrow on top of piston should be facing the exhaust. Other than that pretty simple just make sure to clean all that old gasket material before you tighten it down and use blue locktite on the head bolts.
01-06-2021, 11:59 PM
#14
Tech Apprentice
Thread Starter
Originally Posted by Lone Racer
Just make sure the ring is on correctly. The two ends should meet and sit on that little pin/knub in the piston collar (or whatever it's called). The arrow on top of piston should be facing the exhaust. Other than that pretty simple just make sure to clean all that old gasket material before you tighten it down and use blue locktite on the head bolts.
01-07-2021, 12:40 AM
#15
Tech Adept
Razor blade. Just try not to get any inside the crankcase.
