Your not working on a 250R. Many ppl have make the mistake of doing the same mods that are done to a big machine.
Raise and widen the exhaust. You can now take the head back and have another .010 taken off.
Widen the transfers but do not raise them.
The DG pipe is what I call a loud stock replacement. It will allow a slightly higher rpm.
Boring the carb does nothing for performance.
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