aaaahhhhh....i could cry if i hadnt already dehydrated myself trying to start the bike.
A wee update, its definetly the starter jet, if you have the haynes
book number 2689, titled yamaha
yz & wr 4 stroke motocross and off road bikes '98 to '08, on page 4.16 picture 5.3i.... i can actually see the top of the brass tube im talking about as the starter jet is removed in the pic. My problem is that i cant find any mention anywhere of this tube being an item that should have been removed.
the other thing ive noticed is the guy i bought the bike from had put it on the road and the carb had been messed about with previously because of the road legal can that went on.
The manual says my pilot screw should be out 1 - 1/4 turn out.....the bike wont start at all with it at these numbers, however if i have it between 2 and 2.5 turns out it behaves much better.
all the jets are the correct size and the accelerator pump works without hitting the throttle slide....the only other thing is that i constantly have to adjust my idle screw to keep the tick over from climbing too high.
I had the bike out yesterday and the bloody thing is still behaving bonkers