EYY
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Sorry mate didn't mean to offend. Obviously model dependent. Realise you're a Harley guy and i'm a dirtbike guy lolYou are clearly put of date.
EFI well before any dirt bike thought about it.
BCM with 5v signalling instead of 12v everywhere and fuses/relays etc. Since about 7yrs ago.
E-throttle since 2008
Twin-cooled heads for many years now.
4valve twin plug heads for the last 2.5years
Few reasons dirtbikes didn't get EFI until recently:
-Excessive cost
-Added complexity
-Components are sensitive to shock and moisture
-Added weight
-Tuning complexity
EFI didn't give any real power gains at all for modern dirtbikes. It's mostly about compliance to emissions and so they can remain eligible for FIM events.
Modern 450's can run mid 12's to low 13's with only gearing change - they can do this because of the 12,000+rpm redline. They're designed to accelerate quickly with a great power to weight ratio. Many Harley's will definitely reel them in once speeds are in excess of 120kmph or so. The 80's and 90's 500 2 stroke CR's and KX's are very capable of sub 12 sec 1/4 mile times too.
Just as an example:
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