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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS Hyper 50 Pistion and Ring replacment question
02-05-2008 03:43 AM  10 years agoPost 1


Aurora, Ohio

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I received my new piston and ring for my OS Hyper 50.

I looked for the pin to locate the ring correctly. At first, I could not see it. I could see the hole where it should be, but it didn't look like the pin was there.

But, I think it is pressed in almost flush with the piston.

When I position the ring correctly, then compress the ring completely in (as it is with the sleeve in place), I can feel it 'catch' on the pin.

But, I'm concerned. Does anyone have the same experience with the pin pressed in so much, that it 'looks' like it isn't there?

Should the pin be further out?

If so, I want to return it for a new one.

Any thoughts out there?

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02-05-2008 03:49 AM  10 years agoPost 2

rrElite Veteran


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If the pin is in so far that the ring will not catch, then send it back. But make sure the ring will not catch first.

Put the piston and ring assy in the liner, and try to turn it. You should be able to feel if the ring is slipping.

Hell... I can fix that.
Uh oh..
It's ***ked!!!

02-05-2008 01:05 PM  10 years agoPost 3


Aurora, Ohio

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Thanks Steve,

I'm going to take another look at it tonight with a magnifying glass to be sure I can see the pin.

I'll also try your idea.


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02-05-2008 01:17 PM  10 years agoPost 4


Esperance Western Australia

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Someone here on the forum made the sugestion that the pin can be extracted by finding a drill bit that will fit down the centre of the roll pin very snugly. Cut the drill so you have a small pin punch (by using the end that chucks in the drill) fill the roll pin with grease and lay the piston on a folded rag. Tap the pin punch you made carefully and the hydraulics will push out the pin. Adjust to suit the correct depth.
Cheers Chook

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