Cr250 sputter

I hope this don’t come across as a dumb question. But I have a 2002 CR250.

It runs great! Fresh top end. Plug burns a nice tan brown.My question is when riding up a flat road and the strain is on the engine it runs smooth. But if I back off on the gas just a little it sounds sputtery! But if I hit the gas there is NO hesitation! I can be at 1/4 throttle 1/2 throttle or anywhere. Long as there is a little strain on the engine it is smooth as a kitten, its only when the strain is off the engine maintaining the same throttle position.

Just wondering if this is normal!

Any help would be great!

you have an mx bike my friend ... there not geared to "cruse" thats normal

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