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I have a friend's 03 STX 900.
As far as I know it has had the same symptoms since the middle of last year.
After riding for 20 minutes- 1hr, wide open or slow, time may vary, it looses power. The 1st time I noticed this I had wide open throttle and it dropped to 6K rpm's for a brief second then jumped back to wide open throttle(around 8K I think but don't remember). However the longer it is operated the more power it will loose, after riding it for 30-45 minutes as fast as it allows it will only go 2-3K RPM's. As it looses power you have to adjust the throttle back to keep it from surging. After it sits not running for 20-30 minutes it will run fine.
Last year my buddy installed an electric fuel pump and replaced all 3 coils to correct this problem with no results.
Any Ideas what the problem could be or what I could do to diagnose the problem?
It seems to be related to it heating up but sometime it will run an hour sometimes only 10 minutes before it acts up.
As far as I know it has had the same symptoms since the middle of last year.
After riding for 20 minutes- 1hr, wide open or slow, time may vary, it looses power. The 1st time I noticed this I had wide open throttle and it dropped to 6K rpm's for a brief second then jumped back to wide open throttle(around 8K I think but don't remember). However the longer it is operated the more power it will loose, after riding it for 30-45 minutes as fast as it allows it will only go 2-3K RPM's. As it looses power you have to adjust the throttle back to keep it from surging. After it sits not running for 20-30 minutes it will run fine.
Last year my buddy installed an electric fuel pump and replaced all 3 coils to correct this problem with no results.
Any Ideas what the problem could be or what I could do to diagnose the problem?
It seems to be related to it heating up but sometime it will run an hour sometimes only 10 minutes before it acts up.
