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98 WR400 Carburator problem, help needed

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Need some help here guys, I'm trying to help my fiend get his 98 Wr400 running. The bike has been sitting for awhile and wouldn't start. last week I took the carb apart and cleaned the pilot jet, the bike started and ran fine. Yesterday, we went out to ride and the bike wouldn't run, it did start a few times, but wouldn't stay running. It feels like the pilot jet again, checked it, its clean. I tried changing the plug, it started for a few seconds, wouldn't stay running. Is this carb like a 2 stroke,I tried blowing through the gas line into the carb with the float bowl off? I didn't feel any air coming through while lifting or lowering the bowl, is that normal? Is there another jet besides the pilot that would cause this? Any thoughts would be appreciated.

2001 Aprilia Mille R

2002 Ducati 998 Bayliss

2003 Suzuki GSXR1000

2001 Yamaha WR250

2001 Kawasaki KDX220

1974 Suzuki TM400

2001 Yamaha TTR125l, daughters bike

2004 Suzuki RM100, also daughters bike

2001 Yamaha Beartracker Quad

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