You will really like Frank's rings. They work very well and he's a great guy. Shipping will be regular mail, and won't cost much more than a letter to send. He probably has the ring in stock, and if not he'll make one in a day usually. Price is $9.00 I believe.

I don't use a gasket between the cylinder and the block, as leaving it out raises the compression a little and helps power. What I use there is a sealer used for motorcycle crankcases called "Yamabond". Loctite makes a similar sealant.

For the exhaust, I just use a medium coating of silicone. This is really the only place you should use silicone on these motors, as it does not work well when exposed to gasoline.

Do not use any sealer on the carburetor gasket at all! If you feel like you just have to use something there, give it a thin coat of vaseline.

Do a search for Homelite 25cc engines here and you will find more of my posts and lots of info in general.

Good luck,
av8tor