I have not tore it down yet, but a friend called me this weekend to tell me his Dinli went bye bye. He said they pulled the plug and could put a screwdriver throught the hole in the piston. If they are correct and it did indeed melt down, I think I may know why. Possible bad base gasket on the cylinder. He said he had some really bad fuel too, but I would not expect a melted piston from that.
My question is this...........
How do you get the aluminum out of the case?
Will I need to split the case to get all the poop out of there?
Again, I have not tore it down yet so I don't know the extent of the damage.
I'd love to hear your advice!

 

You will definitely want to split the cases. If there is a hole in the piston there is probubly damage to the crank also.

 

This was caused by "detonation" and the poor fuel may have caused it (I've seen this).
Basically it's timing advanced too far or octane too low for the compression that causes this.
Wash the motor out with gas the best you can.
As for the poop, call your local septic man, I cannot drive my truck to cali to do it myself. [img]i/expressions/face-icon-small-happy.gif[/img] [img]i/expressions/face-icon-small-happy.gif[/img] [img]i/expressions/face-icon-small-happy.gif[/img]

"or just unleaded"..That's funny. [img]i/expressions/face-icon-small-smile.gif[/img]

 

burning a hole in a piston is cause by one of two thing, ignition to far advance, or caburator running to lean, fuel passage blocked in the carb could have cause it to run lean, when i was road racing a yamaha tz250 we used to burn pistons sometimes, most of the time because we're running to lean, all we did was remove cylinder, clean cylinder and head from melted alumium out with drain cleaner ( crystal draino) with a small soft wire brush, it removes the alumium and doesn't hurt the cylinder, the head i think we used scrotch brite and cleaned it up pretty good, as far as the crankcase we had a small vacume and air blower,cleaned it out the best we could, the melted alumium didn't seen to stick to the bottom end because of the fuel mixture. we never hurt a crankshaft because of a buned piston or a sized piston, then insalled new piston and rings and gaskets, go back to racing.

 

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I once had to wash some piece parts out of our engine block as well. For our Pred-90, I removed the intake, removed the reed block, removed the head, removed the cylinder block and removed the piston. Lifted the rear as high as it could go and used lots of gas in a little spray bottle. With the tail high, it flushes stuff out of the cylinder block opening. Then, I took an air hose (connected to an air compressor) the blew out the extra gas. To me, this was much easier then splitting the case. I do have to warn you. When working with gas and air hose, wear glasses and do it in a well vented area. Keep away from sparks and sources of ignition.


Hope this helps as well....

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I heard that some folks use WD-40 (in a large spray can), then air hose the extra fluid out as well... Engine Cleaner might work as well. After using engine cleaner or brake fluid cleaner, you might want to perform a final rinse with gas. Thus, getting that chemical out as well. For me, gas or WD-40 sounds like a great idea.

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[img]i/expressions/face-icon-small-smile.gif[/img]

FIRE!!!!!!!!!

BAAADDDDDD!!!!!!!

Ya, well ventilated area and eye protection sounds like a plan.
Thanks for all the help, everyone.