My girlfriend has a very similar motor to DDQ.
I could ride that bike HARD all day.
She has PT highs, stock stroke welded crank, suufrjag (justin) port work, 21cc domes, vf2,stock carbs. The bike rolls into the power seamlessly. No yanking in your arms. Comes into power at a super low rpm range. It's a very fun motor. Thing won't win any drag races, but bouncing from corner to corner, it's perfect.
A big motor won't win mx. My 4 mil prob makes 2x as much power as hers. I'd take her bike over mine for mx/trails/rec riding. It won't spin the tires every whack of the gas. It's not a powerband that lifts the front violently when it gets a bite.