KX80 with a 100 kit??

Okee..here's one I don't know..

I just ran down a 99' KX80..the guy says he put in a 100 kit...although looking at the cylinder, it says 99cc's...

Now, I am not an expert on lil bikes, but how does a 99cc cylinder mount up to the cases of an 80? I thought there was really a "kit" such as crank and stuff that made it a "100"...

So my question is this, since the bike runs like crap, and supposedly it's a new bottom end and top end. Is this how you get a "100" out of an 80? I checked my buddies bike that has the 100 kit, and his cylinder is actually 82 cc's...

The top end didn't look new when I took it off, looks worn..wondering if I just need a new piston/rings.. but I don't wanna replace that if the cylinder is wrong for this application.. thanx.. j-bo

Local dealer? haahahaaaaa :silly: ...don't have one..

More on the "kit"....I am supposing that this kit includes piston/ring/cylinder/gaskets etc... Is any mod's done to the crank too, or is this kit just a bolt on kit? also do you need to make any mod's to the head? And... when purchasing new piston/rings.. I would also suppose that I get a KX100 wiseco set correct? thanx again.. j-bo