Al_SKi

I have an issue where if my wifes SV650S K6 is rev'd to 5000rpm (or actually just shy at around 4850rpm) the motor cuts completely. It bangs like a shot gun from the exhaust when it dies too.
Up to this rev point it revs ok. Not really crisp but not missing and starts and idles ok. Everything seems fine until 4850 revs then it dies.

This all started after my wife complained the throttle was abrupt when she opened it in a corner. I rode it and didn't think it was too bad for an FI bike but it was there and after a little research it seems the setting of the TPS via the dealer diagnostic mode display could improve this. So I followed the instructions from this site, found the display bar central at tickover but didnt move until 4500rpm. So a few tweaks of the TPS anti clockwise and a couple of idle speed changes and all looked good. Took it for a test ride around my local streets and it didnt really run that smooth and completely stall on me when I tried slightly harder acceleration. Thought i might be pushing home but it fired up and got me there. Since then my home testing has shown the above issue.
It may be throttle position related rather than revs it difficult to say, slowely opening throttle it cuts at 4850rpm. Quick blip from tickover and it cuts out too with loud bangs that scare the hell out of our dog. But the revs go up so quick on the tacho hard to say if its position or going just its going pasts 4850rpm.

I have just noticed if I slowely rev it with the clutch pulled it gets to about 5500 rpm before stalling out with a bang. Also if I move the TPS back to it oringinal position it cuts out at a few hundred rpm higher.

Checked Main TPS and Secondary TPS volts supply and resistances from 0 to 100% and both read close to what my Haynes manual states. No obvious jumps in resistance as they open either.

Any ideas everyone?

Cheers.

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