EFI on MX Bikes

The 2014 YZ250F is fuel injected which is all the rage with MX bikes now.

I didn't think EFI was going to make it to the MX world d/t the rapid decel you get when you close the throttle.

Do manufacturers somehow reduce/eliminate this for MX bikes or is EFI for MX one of those market driven bad ideas?

The 2014 sure looks pretty .... EFI YZ

If you dont like engine braking on a bike you can get the ECU reflashed to get rid of it.

I know that r1,r6,ect modern sport bikes are fully adjustable.

As for MX and EFI, no clue.

The "rapid decel" I think you are referring to on street EFI is a harsh on off throttle transition and has to do with tuning for emissions rather than an inherant trait of EFI. With EFI fuel flow can be shut off completely at closed throttle and high engine rpm to eliminate a lean fuel condition that allows unburned fuel to escape out the exhaust in carbureted motors. the mixture is too lean to burn properly in the combustion chamber and collects in the exhaust system until it becomes rich enough to ignite and pop pop pop! That is before catalytic converters. The harsh on off throttle can be tuned out by various means on street bikes and probably was never an issue on non emission regulated competition bikes.

miniceptor86 wrote:

The "rapid decel" I think you are referring to on street EFI is a harsh on off throttle transition and has to do with tuning for emissions rather than an inherant trait of  EFI.  With EFI fuel flow can be shut off completely at closed throttle and high engine rpm to eliminate a lean fuel condition that allows unburned fuel to escape out the exhaust in carbureted motors.  the mixture is too lean to burn properly in the combustion chamber and collects in the exhaust system until it becomes rich enough to ignite and pop pop pop!   That is before catalytic converters. The harsh on off throttle can be tuned out by various means on street bikes and probably was never an issue on non emission regulated competition bikes.

Thank you sir - that's perfect.

The bad news is now I have to have a fuel injected MX bike. The list grows.