Quote:
Originally Posted by Kiwi rider
I read somewhere recently that 30% of the engine components in the 300 motor dated way back to the original GPX250 motor from the late eighties.
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The GPX250 was released in 1984, so the engine would have been designed in 81-83 all by hand, back then. It was until 2004 the most powerful stock production 4-stroke engine in a Bike ! So 20 years st the top of the pile, until the 1000 engines took over.
The 400 is 650 based, so nothing from the 300 will be in that engine. It’s also a lot heavier than the 300 engine. The 650 weight in at around 62kg which is a heavy lump, the Busa 1300 is only 58kg !!!