98 R1, not starting, thudding when throttle pinned, help!

[bluemonk]

Can anyone give me any hints as to what the problem could be? Bike was running near perfect one day, and two days later, I get this (youtube link at the bottom of this post). It turns over, so not an electrical problem I would say. It seems to "start up" but if I pin the throttle, all I get is this loud thumping response. When I let the throttle go, it dies.

Recent changes:
new TPS fitted
new/used exup valve fitted (perhaps siezed exup valve?)

I'm not the MOST mechanically minded, but I can wrench a bit. I'm in the CBD if anyone can help or suggest potential causes/solutions, would be greatly appreciated!!!



Youtube link : http://www.youtube.com/watch?v=wWfIa0WNoq0

[hayd3n]

someone block your exaust??
or blocked intake??

[Teflon]

I would start with checking the HT leads and spark plugs...

[cs363]

Recent changes:
new TPS fitted

Have you set up the TPS as per the manual? If not that would be your first step........

[puddy]

A lot of them do that Dumpty:Me has a new one and it thuds at just about any throttle setting.