Hey guys just purchased an 07 kx450F and it seems to lose antifreeze. I don't see it come out but it gets low all the time. I really can't tell if it over heats. It also is a real pain to kick. I kicked my buddies honda 450 and yz 450 and we all agree that there is definetly something wrong. Maybe the valves?? Anyone with any insight on what be happening please let me know. I do'nt want to return it i would rather fix it but maybe i can get some money back!

i would return it. it sounds like you have a leak and the antifreeze is probably being burned up in the engine. it is probably not noticeable because it burns off in little amounts. you may have a problem with your engine because of the leak which is what makes it hard to kick.

Take it back now. something Big Time is wrong and coolent is going some place where it is doing damage.