I have a 2005 kdx220. I find that going through 1st and 2nd gear theres little power, I cant even pop the bike up. when i hit 3rd and up theres lots of go, but don't throw me off. i find 1st and 2nd sluggish. iam not much of a mechanic, but the other day i changed the plug, cleaned the air filter and took the carb apart and cleaned it. after doing all this i found little difference. Any suggestions?