I live in New England, so for me the 52 works in the rocks and woods. I tried a 50 before that and wanted more.
What I always find helpful is to know what you have in the bike for jetting. So I would pull the carb and record what you have in there. While you are at it clean the carb, make sure the float height is correct and start with a clean filter. If you are not sure about the plug I'd put a new one in too, they are cheap enough.
Does the bike give you a "boo-whah" sound when you open the throttle? That suggests you are lean. I'll take a short cut here. Look for MattR's jetting database and compare your settings. Consider if you need to change some jets. Not too technical but I hope it helps.
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2004 GasGas DE250
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