Question about 2002 Yamaha SR 400
2002 Big Bear 400. Bought new, original owner, only 500 miles on bike. Used for hunting season and not much between seasons. It sat for almost a year, and more than likely had ethanol in tank. It now dies after a few seconds upon startup when fully choked. Will not even hit without choking. After it dies, it will not re-start unless I work the throttle quickly for several minutes until it warms up. It backfires through tailpipe and breather box under seat while struggling to run during warming. Will not idle until it warms for several minutes while fully choked. Once it warms up for several minutes, it runs fine and will re-start until it cools off again and problem repeats. It does continue to miss occasionally and backfire when run at WOT. Drained old gas, put in fresh with Sea-Foam and replaced plug. No difference. Cold weather makes problem worse. Any ideas?
Kevin in Louisiana
Sounds to me the valves are not properly adjusted,..like their to tight,...i had run into this in a japanese car once,...check it out and let me know,.....cracklin joe
Posted on Jan 10, 2010
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Posted on Jan 02, 2017
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