Sorry if I am a bit late to the party, but I have disconnected my PV before, it makes a difference in the low end, mellows the hit, but it WILL still hit in the top. You wont have as much power in the low to mid range, but up top you will still have most of the power. Try it, it's not like it will cause any harm. You would be basically turning your 250 into a powerhouse of a 125, which is a useful learning tool/stepping stool. Good luck 
Hell yeah Imma give that a try xD my engine will probably grenade but oh well.