Ok Folks - first minor or possibly major problem with my 03 650:
I am having minor and very occasional cough or intake backfire on low speed throttle closing. And more seriously, the low speed, 1/4 throttle low speed cruise (around 35mph standard drive maode), is feeling slightly rough, or 'hitchy".
THe idle is not lumpy, and accel seems good at open throttle. Indeed, the more the throttle is open, the less apparent the problem is. But that low-mid power band is not right.
The best way to describe this to another 650 owner is thus:
You know that this bike normally feels that it is 'ahead of the throttle' even at low-mid setting (35mph ish), it gets there easily and and faster than you thought at very small openings. But now my 650 feels, 'behind the throttle, slight surging, not smooth at that low-mid seting and feels as though I have to twist a little more. This problem also is exacerbating the dirve train lash, which is no joy on the 650 even when working 100%.
My feelings as to what might be wrong, your opinions are important to me:
1) I think my high speed run for 20 mins at 100+, may have vibrated the throttle body mounts loose on one side, creating a very slight air leak at the manifoild side.
2) the Throttle body synch might just be off enough to create this low speed problem. Again caused by the 'thunder run'.
3) bad fuel, water contamination. I have tried a full can of dry gas injector cleaner. W'll see what happens.
4) Semi-clogged injector one side. Semi-loaded spark plug - but idle is smooth.
Well that's it.
This type of problem is one that a dealer will never fix under warranty, as it is too subtle, and too hard to diagnose.
Anyone with similar experiences regarding this failure mode, or any ideas on how to troubleshoot or investigate this, I would greatly appreciate your input.
I am having minor and very occasional cough or intake backfire on low speed throttle closing. And more seriously, the low speed, 1/4 throttle low speed cruise (around 35mph standard drive maode), is feeling slightly rough, or 'hitchy".
THe idle is not lumpy, and accel seems good at open throttle. Indeed, the more the throttle is open, the less apparent the problem is. But that low-mid power band is not right.
The best way to describe this to another 650 owner is thus:
You know that this bike normally feels that it is 'ahead of the throttle' even at low-mid setting (35mph ish), it gets there easily and and faster than you thought at very small openings. But now my 650 feels, 'behind the throttle, slight surging, not smooth at that low-mid seting and feels as though I have to twist a little more. This problem also is exacerbating the dirve train lash, which is no joy on the 650 even when working 100%.
My feelings as to what might be wrong, your opinions are important to me:
1) I think my high speed run for 20 mins at 100+, may have vibrated the throttle body mounts loose on one side, creating a very slight air leak at the manifoild side.
2) the Throttle body synch might just be off enough to create this low speed problem. Again caused by the 'thunder run'.
3) bad fuel, water contamination. I have tried a full can of dry gas injector cleaner. W'll see what happens.
4) Semi-clogged injector one side. Semi-loaded spark plug - but idle is smooth.
Well that's it.
This type of problem is one that a dealer will never fix under warranty, as it is too subtle, and too hard to diagnose.
Anyone with similar experiences regarding this failure mode, or any ideas on how to troubleshoot or investigate this, I would greatly appreciate your input.