Question about 2002 Yamaha SR 400

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2002 Big Bear 400. Dies after a few seconds upon startup

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

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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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10-YEAR/100,000-MILE POWERTRAIN PROTECTION Covers repair or replacement of powertrain components (i.e., selected engine and transmission/transaxle components), originally manufactured or installed by Hyundai that are defective in material or factory workmanship, under normal use and maintenance. Coverage applies to original owner only, effective with 2004 model year and newer model year vehicles. On 1999-2003 model years, coverage applies to original owner and immediate family members (i.e., wife, husband, daughter, son, stepdaughter, stepson).

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I recently bought a 2004 klx 400 sr dual sport. the bike starts up with no problems. After i ride it for a few minute the bike starts to act like it is running out of gas then stalls. it will turn...


Hello
Your running out of gas.
the fuel filter needs replaced.
your fuel filter is clogged and isn't letting a full flow of gasoline through.
change your fuel filter.

Also check to make sure your gas tank vent isn't clogged.
a clogged gas tank vent with pull a vacuum and try to **** your tank in, but it can't, so your fuel flow stops if it can't breathe.

That should take care of your problem.
have a great weekend
Big Al

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1 Answer

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