What is the bore size on a 86 lt230s and how do I tell for sure?

 

its a 66mm bore. to be for sure take it to an auto garage or atv mechanic and they should be able to tell you for sure. it might cost a couple dollars.

 

Thanks, I needed the size to change the rings.

 

Buy a caliper and measure it. You can buy a cheap metal electronic caliper at Harbor Freight for about $20 or less. I own one and it works fine. How do you know that your cylinder doenst need to be bored, which would require a new piston and rings?

 

If the bore in shinny and smooth. you are in the clear. I wouldn't rebore anything unless a certified mechanic told me to. chanking rings doent mean a rebore by any means. Unless you see a noticable scratch of score mark. i change my rings every 2 years just as a precaution because every once in a while i race my friends on our GNCC course.

 

Ya, I was racing my friend last weekend and now it burns a lot of oil. I'm sure that they are the stock rings because the other owner didn't know a thing about four wheelers, so I think it's time for a change anyway.

 

My point was that no one knows the bore of the cylinder until you open it up and measure it...unless the guy bought it new. Buying rings for a 66mm bore before you tear it down could be a waste of money. Yes, it could be stock bore, perfectly smooth, and only need rings. It could also be scarred up and need to be bored, which would require piston and rings. If you are going to install rings anyway, tear it down, remove the cylinder, and check the bore for scratches, take measurements with your new caliper, then buy parts.