I'm planning on breaking in the new topend on my '95 KX with good ole TC3 dino 2 stroke oil. I think I know the answer to the question, just wanted some feed back if anyone has had good success with synthetic for break in.
Thanks John and Doordie (and whoever contributed) for your top end sticky, tons of great tricks and info. Beast will be like new again! (better be for how much $ I dumped into it!!).