I'm hoping someone with some engine tech knowledge might be able to shed some light on my following problem:

I have a 2007 XR650R that has now covered around 15,000 miles since October 2007.

It has been ultra reliable, other than the fact it has always used (a significant amount) of oil when used at higher speeds on the road - typically constant throttle stuff at 60mph+, ie. on autoroutes/motorways.

Used off-road, minor roads on the trail etc. it hardly uses any oil, but when you do have to blitz a few miles on a constant throttle, it starts to drink at quite an alarming rate - coming back through Europe last week it was typically 100ml per 100kms... which is quite frankly, shocking!

It doesn't seem to be smoking, although I notice the crankcase breather pipe is weeping oil after a heavy session. But it must be burning it, otherwise where the hell is it going?! It's like a bloody two stroke quite frankly!

I did have a similar problem with the bike initially (first 3000 miles), which was eventually traced to a leaky/burnt exhaust valve, all of which were replaced (along with the piston and rings) under warranty...

I know the US websites/forums say that this is a trait of this bike (it is afterall essentially a race engine) particularly when used on the highway - and can often affect certain examples, but I seem to have got a particularly juicy one...

So........... any ideas?

JennyMo xxx