Hey eilla,<br />Without a lot more information, it's not possible to give more than an "educated guess." My guess is you have a serious fuel delivery problem. Check your entire fuel system from tank pickup through carbs. I'm sure you need to thoroughly clean your carbs.<br />Backlash
Do you have spark to all cylinders? Is the compression good? If so, when you are trying to power up, have someone squeeze the primer bulb repeatedly. If it goes, your fuel pump is shot. If not, you probably need a Carb. rebuild.
