I recently bought an '07 WR450F from a friend. It had been parked up under a cover for at least three years and was looking a bit rough. I gave the carb a full rebuild, set the valve clearances, put a set of Continental SMs on the 17'' wheels and started using it for blasting around the back lanes. The bike runs absolutely spot on, starts first kick, never stalls, never smokes. It's a stock UK bike except for AIS removal and an FMF silencer.
My problem is that despite having the oil level correct it spits oil into the airbox every time I ride it 'enthusiastically' Now the previous owner says he never had this problem so I'm assuming I've routed the breather hose wrong somehow. It all appears correct to me and I cant see any way to route the stock breather pipe higher.
Could anyone share a photo of the CORRECT breather hose routing to make sure I've done it right?
I'm an experienced motorcycle technician and usually I would make notes of this kind of thing but in my excitement to get the bike on the road I forgot. Your help would be massively appreciated