Check if it's nothing obvious as people have suggested, then have a look here could be the wiring to the injector.

http://www.xt660.com/showthread.php?...highlight=loom

Ill give it a try. How would dirt get realistically into the fuel line? I hope its not the injectors. The bike is currently at the mech. For some reason the HID ballast wasnt connected to anything.

Hi could the bike be in limp home mode and need resetting after the tip over.
Steve

Resetting??

If it the lean-angle switch had tripped it won't start at all and the engine trouble light would be showing code 30. Once it is reset (after turning ignition off and back on again) it should run normally. The lean-angle switch will only give to running conditions: either it will, or it won't - there is no fail-safe mode for this fault.

The ECU should have reset the speedo sensor error code (42) and put the light out as soon as the bike was started (after fixing the coupler) and run at over 20mph.

Could well be, especially as other wiring was pulled about in the fall. However, this fault would throw up the engine trouble warning light at some point and is likely to cause intermittent or total non-running/non-starting and/or an obvious miss-fire, rather than a simple lack of power?

T'was the air filter, guys. Took a clean dish cloth as a filter and went for a quick spin. The beast is back! The monster power in all its devastating might was pulling through the low/high gears, low/high revs and mid range like a gorilla on something illegal. Aaaahhh, what a relief! What a rush! Glad it wasnt something technical or something expensive. Feeling much better. Cleaned the air filter and there was some dirt. Trick now is to get the oil exactly right so that the thing can breath properly. I flippen love this stuff!!

Is it a DNA or cotton type filter, foam, or the stock paper job? Sounds like it might have got covered in excess oil that was floating about in the airbox from the crankcase breather? Is it an 08/09 bike by any chance? Unusual to find a filter in normal use that gets that dirty performance is affected so badly.

Pleiaides, yes it a DNA filter, 2000km. PO didnt clean new filter and didnt have to since the bike was pulling deliciously. I did ride some off road the day before I tipped the bike over. But a few days before that I opened up the airbox RH and there was some light oil residue but no oil pool. I guess the fall caused some breather oil to splash onto the filter. The bit of dirt plus oil choked it good. Yes it is a 2008 Tenere. Lovely.

The early bikes suffered from inadequate baffling in the crankcase breather chamber (which sits under the throttle body) and tend to blow a fair amount of oil into the airbox under certain conditions. It is not a problem, but something you do need to keep an eye on - empty the drain tube regularly. The breather chamber was redesigned from late 2009 and can be retro-fitted, but it is a pain in the ass job to do.

Im not sure I understand. The engine is 'new', it was installed in Aug 2014. So the crankcase should be of a newer design thus not have the early bike breather problem? But yes, I will clean the breather hose.