im workin on a 1989 cr250r and when i took the eng out i noticed it had a little box between the eng( stator) and cdi, it has answer roost boost on it .... ? has anyone every hear of these ... im guessing it advances the timing or something , are they any good ? ..... would it work on my 86 trx 250r ..? ... and would putting a 300ex coil on my r work? its 4 stroke so im thinkin not... but maybe it dont matter... it is like bran new and im looking to get little better spark ( mine looks a little weak)