If you skim the head (assuming the combustion chamber is in the head and not the piston) it will raise the compression. It is not a simple job becasue you can easily take to much taken off or not enough. Regardless, once it has been skimed, you will need to get it rejetted straight away. This is the same with the air filter.
If you put a high flow air-filter on then you will get more air in the mixture. This will cause the bike to run lean which can cause detonations, which results in the pistons melting.
Nothing wrong with polishing the head. Just make it so thats a smooth flow, but don't actually polish it. It needs a semi rough finish to help mix the fuel and oxygen.
Personally i'm not going to bother doing any of this to my GT250R. But good luck to anyone that gives it a try
While you sit there liking things just cos' everyone else does, I'll be standing up here keeping it real.
Bookmarks