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 Post subject: RZ500 copper head gasket
PostPosted: Fri Apr 21, 2017 7:32 am 
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Joined: Sat Nov 12, 2011 10:50 pm
Posts: 133
Location: Adelaide, South Australia
Hi, would be a bit hesitant to use them.
Your thoughts.

http://www.ebay.com/itm/Yamaha-RD500-RZ ... SwvKtY9dRU


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 Post subject: Re: RZ500 copper head gasket
PostPosted: Fri Apr 21, 2017 8:29 am 
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Joined: Sun Oct 28, 2012 6:38 pm
Posts: 678
Location: Spielberg, Austria
Don`t think the RD500 heads are stiff enough to get sufficient pressure on the head gasket to seal.
I can`t imagine that the parts are so flat that there will be no leak, at least not in original condition.
Copper rings usually have just a small contact surface which leads to a high pressure in this area.
This pressure deforms the copper and afterwards the seal fits to it`s countersurface.

Copper gaskets are just 1x flexible, while tightening the parts it will be deformed which leads to - i hope the translation is right - "cold hardening".

It`s also not clear which material is used for the gasket - maybe cold rolled sheet metal.
This material needs to be heated up to get it soft again (same process if you want to reuse them).
Temperature needs to be around 400-800°C for around 0,5-3h depending on the alloy.


I think O-rings are the better solution if you want to have reusable gaskets.

_________________
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda NS400R NC19
Honda CBR 1000 RR SC57
Yamaha R1 RN04


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 Post subject: Re: RZ500 copper head gasket
PostPosted: Fri Apr 21, 2017 12:39 pm 
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Joined: Fri Sep 02, 2011 7:02 pm
Posts: 289
Location: UK
totaly pointless, they're just not maluable enough, maybe they would work if a fire ring was set into the cylinder, of coat both sides with sealant. how many times do you imagine your going to take the top end apart in the forseeable future ?


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