1983 CR80 Piston?

Reveeen · 10-25-2010, 06:39 AM

As the title says.....1983 (or older), piston changed in 1984 (and newer).

Weldangrind · 10-25-2010, 11:49 AM

Do you have specs on it? The reason I ask is that I have a NOS two stroke piston here, and I have no idea what it's from. It's yours if you can use it.

I'd be happy to measure diameter, ring land height, pin diameter and length and whatever else you can think of if you provide some measurements.

FastDoc · 10-25-2010, 01:05 PM

What about Wiseco or one of the aftermarket places? With a piston it would be nice to have a new one.

Reveeen · 10-25-2010, 02:56 PM

Ok..... if no one has one I WILL be buying new (Wiseco for around $110)

Piston size 49.50mm to 51.50mm, 2 ring, 12mm pin.

I have no other "hard specs".

The reason I want a piston from the 1983 (or earlier) is because of the ring gap locating pins being spread far enough to clear my exhaust port on a Honda Lead scooter. I will be moving the jug (cylinder) to change the port timing a bit (spacing the jug up from the case to advance the engine timing) and planing the head to give me around 200psi.

Weldangrind · 10-25-2010, 03:10 PM

Sorry, this one is 62mm. I hope you find what you're after.

At first I thought that 200psi is quite high, but I suppose that kind of pressure is easier to achieve in a small displacement environment. Also, you're the master; you've likely got it all figured out.

10-25-2010, 06:39 AM	#1
Reveeen Join Date: Jun 2009 Location: orbital platform Posts: 741	1983 CR80 Piston? As the title says.....1983 (or older), piston changed in 1984 (and newer).
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10-25-2010, 11:49 AM	#2
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Do you have specs on it? The reason I ask is that I have a NOS two stroke piston here, and I have no idea what it's from. It's yours if you can use it. I'd be happy to measure diameter, ring land height, pin diameter and length and whatever else you can think of if you provide some measurements. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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10-25-2010, 01:05 PM	#3
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	What about Wiseco or one of the aftermarket places? With a piston it would be nice to have a new one. __________________ Happy to serve.
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10-25-2010, 03:10 PM	#5
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Sorry, this one is 62mm. I hope you find what you're after. At first I thought that 200psi is quite high, but I suppose that kind of pressure is easier to achieve in a small displacement environment. Also, you're the master; you've likely got it all figured out. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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10-25-2010, 02:56 PM	#4
Reveeen Join Date: Jun 2009 Location: orbital platform Posts: 741	Ok..... if no one has one I WILL be buying new (Wiseco for around $110) Piston size 49.50mm to 51.50mm, 2 ring, 12mm pin. I have no other "hard specs". The reason I want a piston from the 1983 (or earlier) is because of the ring gap locating pins being spread far enough to clear my exhaust port on a Honda Lead scooter. I will be moving the jug (cylinder) to change the port timing a bit (spacing the jug up from the case to advance the engine timing) and planing the head to give me around 200psi.
	0