bored or not

[vince]

I AM REPLACING A CRANK, CYLINDER, AND PISTON ON MY BANSHEE AND I DO NOT KNOW IF THIS ENGINE HAS EVER BEEN BORED. I DO SEE A NUMBER 200 ON TOP OF THE PISTONS, DOES THAT MEAN THAT IT IS BORED? AND IS NOT A .020 NUMBER, I AM POSITIVE THAT IT IS A 200 NUMBER ON TOP OF PISTON. ANY HELP WILL BE APPRECIATED SO I CAN ORDER THE CORRECT PARTS. THANKS..

[bigboybanshee]

The best and most accurate way to tell if the cylinder is bored and/or what bore it is on is by using a micrometer.

[applpro]

I AM REPLACING A CRANK, CYLINDER, AND PISTON ON MY BANSHEE AND I DO NOT KNOW IF THIS ENGINE HAS EVER BEEN BORED. I DO SEE A NUMBER 200 ON TOP OF THE PISTONS, DOES THAT MEAN THAT IT IS BORED? AND IS NOT A .020 NUMBER, I AM POSITIVE THAT IT IS A 200 NUMBER ON TOP OF PISTON. ANY HELP WILL BE APPRECIATED SO I CAN ORDER THE CORRECT PARTS.  THANKS..

374163[/snapback]

If you're doing a rebuild, I would take both cylinders to a machinist & have them both checked for wear. You would probably be money ahead to bore both to the next size & replace both pistons & rings. Be sure your machinist does motorcycle cylinders regularly. Some guys don't chamfer the internal ports & if they don't it will snag a ring.

[RBD]

Sounds to me that they are 2 mm over.