I'm hoping I can get some advice from you guys. I have an 03 ozark 250 I bought about a year ago. It'd been sitting for years when I bought it, so I rebuilt the carb. Its been running fine until recently. I let it sit for about three to four weeks and when I fired it up its developed a hesitation/miss from 1/3rd throttle up. It starts and idles great, and will run fine on light throttle...but when you give it the beans it just misses and hesitates.

I drained the gas and filled with fresh gas, changed the plug...no change. I put some marine grade fuel treatment thinking that might clean up the carb and have run it for about a half hour...no change.

Ideas?

 

You need to remove and clean the carb.
Sounds like the main jet is plugged.

 

Thanks for the advice. I took the carb apart and...well, the main jet had come unscrewed and was rolling around the bottom of the float! LOL Put it back together and not surprisingly its running perfect again.