Dinged up Piston help

[Tombstones81]

got some parts comin from a member, so i might be good so far

[BaltimoreGS]

Snapped a few pics for you.  I bought the one bad cylinder jug a while ago from another forum member to have as a spare.   After honing I found it had a vertical gouge that made it unusable without over boring     Oh well, buyer beware I guess.  The second bad cylinder jug is off a bike I bought 2 Christmas's ago from a craigslist seller.  It was on CL for a while before the seller finally accepted my low ball offer.   I decided to just sit on it and fix it in the spring when I was ready to flip it.  I had done a compression test on it before I bought it and everything seemed good.  The seller said she had a friend work on the carbs but it never ran right.  Come spring I went to fool with it and it had no compression on one cylinder.  I found the rocket scientist who worked on the carbs had connected the tank drain hose to the petcock vacuum port on the carb.  The bike had sat outside all winter in the snow.  As the snow melted, some of the water had run down the drain hose, into the carbs and into the one cylinder.  Good times!

As far as parts, it depends on how thorough you want to be.  At the minimum you need the gaskets, a good piston and the replacement valve.  Don't forget the o-rings on the jug, they allow oil pressure to reach the head.  There's also the copper crush washers and the cylinder head cover gasket which is re-usable if it is still pliable.  Don't forget to put some RTV in the cam corners.  You could re-ring it and replace the valve seals while it's apart. Or you can go all out like sledge said and bore it out and start fresh.

-Jessie

What a good cylinder looks like (ignore the dirt specs)



Cylinder with a vertical gouge.  Any groove you can catch your finger nail in is bad.



This is the rusted cylinder.  Notice the black areas the hone didn't clean up.  I'm not even sure over boring would clean up this mess.