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dirt bike cdi box's?

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Those did box's like black box and big gun and other cdi boxes s do they work. I see they say up to 5 HP gains but that's a lot..for a dirt bike

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Those did box's like black box and big gun and other cdi boxes s do they work. I see they say up to 5 HP gains but that's a lot..for a dirt bike

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The 5 hp gain is pretty unrealistic if you're thinking of 5 at peak power.  It's very unlikely that altering the timing curve at 8500/full throttle would do anything of the sort, and it certainly wouldn't happen on any YZ450, but it could produce that much gain in the mid range on one or two models.  The '05, '08 and '09 come to mind.  The real advantage to the more sophisticated ones is that they can be tweaked to alter the power output according to track situations or your particular needs. 

 

The cheaper ones with only a single fixed program are not likely to help most YZ's very much, really.

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