Seized Piston

I doubt running a generic "snowmobile oil" will cause a problem. (technically there is no such thing other than what the label reads)

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Well I think I got it fixed. My carb has been leaking fuel like crazy so I finally got around to taking it off and adjusting it correctly. I noticed the air filter was soaked with fuel so I figured that it must have been choking the airflow. So I removed it and but the carb back on and went for a long (almost full tank) ride with no problems. Engine ran the best ever. I will put the air filter back in tomorrow now that I got the flooding problem fixed. I am learning a lot and hopefully the problems will be fewer. Thanks everybody for your support.

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hang in there life only gets better

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Exellent!

deacon- did I seem terse in my reponse? Sorry if I did. Sometimes I forget that everybody hasn't been working on i.c. engines since they were knee high to junebug and I assume stuff.

I saw a guy try to screw on his carb up side down once (on a dirtbike) and when I laughed at him he almost gave me a knuckle sandwich. I just assumed that everybody knew they didn't work that way.

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If it ain't broke, and you mess with it long enough, it will be.

Well I just didn't want to offend you. Your advice is always right on, sometimes I tend to think everyone is as dumb as me lol. Honest I had no idea there was a bump in the ring groove. I worked on a lot of cars but this is my first time inside any engine at all. If my engines needed that kind of work I took them to the shop. This has been a really good experience for me.

On this engine we are talking about here, it occured to me that it might be overheating. I had a pinto seize for that, but it never did work again. I'm glad his freed up with apparently no harm done. Its the old timex big ben and the swiss watch thing. These cheap engines will take a lot of abuse evidently.

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction (new installment daily).... http://chinesekitmotorbike.blogspot.com/

http://freekibble.com feed the homeless dogs

Look at my top end take apart and rebuild for some info on putting the piston back into the cylinder and the way the rings fit on the piston around the ring pins etc. the wooden piston support stand will really make putting the piston in the cylinder very easy and you will not have to fight it as much. the wooden tool can be made out of a wood shingle or wood stirring stick even a couple of popsicle sticks will work in a pinch and you can run down to the min mart and get your favorite flavor eat it then use the sticks.
Norman
Look up 2 stroke engines on Google there is a lot of info on piston and cylinder clearances etc and why a 2 stroke will seize. these engines run with some very close clearances compared to 4 strokes. warming up a 2 stroke before putting it under a load will stop a lot of seizures.

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How many hours of the engine? Almost sound like the the piston clearance is too tight. Check side wall of cylinder on the exhaust side for scoring. Scorring is normally due to a cheap oil/overheat situation. As far as the black cylinder, I have never seen anything like that before, when you pull the jug off all should be shinny except piston top and head, maybe a bit of slight darkning of the exhaust side. Let us know. Curious now !

Here is a picture of the top of my head, and pistion. It's black too.





Runs good like that. What are the walls of your cylinder like? Run your fingers accross it.
cylinder walls are shiny though.

Looks like you head gasket was leaking. Time for a de-carbon too. Use a wooden stick.

24:1 or 30:1 synthetic oil after will keep that to a minimum.

Piston skirt scuffing is usually from "cold seizure" where the piston expands faster than the cylinder walls because of too much load/revs too soon before the engine is fully warmed.

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If it ain't broke, and you mess with it long enough, it will be.