Rings are usually fairly consistent, they didn't ought to change much between kicks.
Get the head back off, turn the engine over slowly and see if the piston runs up and down properly. If you're gasket went bad enough to get coolant through the engine it may well have hydraulic'd the piston and damaged, big end, little end, con rod.
I recon you could be looking at bearings, con rod. Change piston and rings while they are out. If your piston has flapped about a bit and the rings have scored the barrel, you may need a replate it too.
That all sounds like a nightmare, but the beauty of 2 stokes is that it's really not a big deal.
I've seized 250 2stroke pistons. Apart from the wait to get the head back from nicoseal plating, its was 2 or 3 hundred dollars for bearings, vertex piston and rings. New plug and reeds and you have a virtual new engine!
If you do a rebuild, run in properly with atleast half a dozen heat cycles before you ask too much of it.
When you say you replaced the head gasket, I assume you mean you had the cylinder head off so you just exposed the piston top? Most of my bikes had rubber O rings up there.
If you haven't taken the barrel off, definitely look down on the piston top and turn the thing over slowly.
When you remove the head, you are likely to get coolant into the barrel. Are you sure this hasn't made you think that there was coolant going through the engine?
What were your symtoms? A bang? Did it just stop? Just a burbling lack of power 'til it stopped?
With 2 strokes there really isn't that much in there. Check your reeds, I have had them break and go through and out. Once you have a bit of reed missing the bike wont go.
Also if you don't get the bike hot enough it is easy to foul the plug, this will bring it to a stop. If the plug is dark and sooty, get a cooler plug. ie look at the part number it may say 8 in its number, try a 7.
I never rode my last race bike hard enough, 9's fouled up, 8's were fine. Just maybe you haven't been thrashing it hard enough. lol.
If at first you don't succeed....take a longer run up!!
Last edited by SHEP; 02-16-2013 at 09:15 AM.