Will a VFORCE3 Block from a 03 Honda CR250 fit an 05-06 CR125?

There is a pretty big difference in how they look in a picture and how they look side by side. Then it gets a bit deeper after "fit". Reed thickness etc can differ due to vacuum differences and the rpm band they may be aiming at.
 
It's not that at all. Around 2003 Honda put the same size reed block on the cr250 that had been on the cr500. I had a few for my cr500 that were in the shop. My friend bolted one up one to his 250. What worked good on the. 500 at 6k wasn't so much at home on the 250. If you have them to compare it can be fun.
 
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