07 wr450 wont start unless on reserve

i just picked up a 07 wr450 and it will only start on reserve:bonk: ????yes i have had the gas tank full when doing this and it still wont start unless on reserve....but when im riding and turn the gas to the regular on position itll ride good until full throttle then itll fall on its face like crazy....whats my prob??

You have a clogged gas tank filter screen or a bad tank petcock.

Probably just need to pull the fuel tap out of the tank and give it a good clean, it's most likely blocked or partially blocked in the pickup for the fuel 'on' position. Give the tank a good clean out as well.

alright i will try this guys thanks for the help

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