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1992 wr500

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An 87 and newer should be the same as your wr they share the same part number. The 84-86 I think may bolt up but the porting is different , different part number. 

How bad is your cylinder? You should be able to go 2mm over stock on a rebore.

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An 87 and newer should be the same as your wr they share the same part number. The 84-86 I think may bolt up but the porting is different , different part number. 
How bad is your cylinder? You should be able to go 2mm over stock on a rebore.

Okay thanks! And you know how the cylinder has the two ends that stick out and go in the bottom end? One of those broke off . Not sure how else to describe it lol

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Get ready to have a grin that will last for weeks when you get it running.

I mix at 20-1 my IT465 has a 490 jug bored out 510cc.

The Big Blue cloud is your friend do not listen to those who say mix at 50-1 or what ever.

 

Here is info on the Big Bore Yammy:

http://advrider.com/index.php?threads/building-a-1981-yamaha-yz465-factory-replica.772033/

http://www.yamahait.com.au/forum/index.php/board,20.0.html

Info on IT465/490 and YZ465/490 is also applicable to the WR500.

You can have the squish band done to the head or do like I do and run TWO head gaskets.

There is nothing like riding a 500cc two stroke.

 

 

Edited by Truman Sparks
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Get ready to have a grin that will last for weeks when you get it running.
I mix at 20-1 my IT465 has a 490 jug bored out 510cc.
The Big Blue cloud is your friend do not listen to those who say mix at 50-1 or what ever.
 
Here is info on the Big Bore Yammy:
http://advrider.com/index.php?threads/building-a-1981-yamaha-yz465-factory-replica.772033/
http://www.yamahait.com.au/forum/index.php/board,20.0.html
Info on IT465/490 and YZ465/490 is also applicable to the WR500.
You can have the squish band done to the head or do like I do and run TWO head gaskets.
There is nothing like riding a 500cc two stroke.
 
 

Thats what i like to hear! . If i were to keep my jug (wr500) and put the 490 sleeve in it and get a stock wr500 piston and rings. Will all of that fit right?

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Get ready to have a grin that will last for weeks when you get it running.
I mix at 20-1 my IT465 has a 490 jug bored out 510cc.
The Big Blue cloud is your friend do not listen to those who say mix at 50-1 or what ever.
 
Here is info on the Big Bore Yammy:
http://advrider.com/index.php?threads/building-a-1981-yamaha-yz465-factory-replica.772033/
http://www.yamahait.com.au/forum/index.php/board,20.0.html
Info on IT465/490 and YZ465/490 is also applicable to the WR500.
You can have the squish band done to the head or do like I do and run TWO head gaskets.
There is nothing like riding a 500cc two stroke.
 
 

50:1 if fine with synthetic matter of fact some manufacturers recommend even higher. Read the bottle not the web.
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