Av jus bought a yzf 426 the guy shown me how to start the bike wen we was there tryed starting 2day it wount go there are sparks flying out the exhust is that right

Yes it can and is.

did the guy give you the starting method. if not you have flooded the plug and it will only start if you replace the plug or dry it out.
method. dont touch the throttle. pull decom lever and kick over 10 times.
release lever get topwith kick start. pull decom lever slightly to allow kick start to drop 1 notch. release lever and let kick start back up and kick hard.
repeat should start second go.

WR stands for wide range if I remember in 1989 there was the YZ250 and the WR250 both two strokes.
The WR was the enduro model with a wide range gear box. low first gear and overdrive in top
The WR four strokes started around 1998, but Im not sure if the gearbox are much different to the YZF.
In australia there is a compliance plate on the headstem with model ID.

It could actually be that the countershaft sprocket has stripped-out the splines that engage it to the countershaft. Take off the cover and have a look at the sprocket. Hopefully it is only the sprocket that is damaged and not the transmission shaft that it mounts to.
Another possibility is that the clutch cable has somehow gotten waaay out of adjustment. Just feel the clutch lever; you should have some free play at the lever. In other words, the first 1/4" or so of lever movement should do nothing except take up a small amount of slack in the cable.
Are you sure it is actually going into gear? Or have the splines on the shift shaft stripped-out? These are the things I would check first. If it isn't one of these, then I predict some major transmission work is in your future.

For a cold start, turn fuel on at fuel tap. Pull out the choke knob. slowly kick the kickstarter until you feel it become harder(more resistance). push past this resistance then release the kickstarter. What you have done is put the piston in the position just after top dead centre of the compression stroke.Now give it a big kick whilst opening the throttle slightly. There is a real techneque to it so don't think your the only one who has problems! Otherwise, ask your local Yammy dealer for a look at the owners manual. It has a description on how to both hot & cold start your bike. They may let you photocopy it. Good luck.
If it just isn't happening try removing the sparkplug,put it back in the plug cap,rest the plugs metal body on the cylinder head (don't hold it there or you could get a nasty shock) Now kick the kickstarter while watching the sparkplug gap. Did it spark? If it didn't theres a problem. No spark means it wont run! Then you'll need to find out why theres no spark. Hope this helps to get you started Otherwise let us know and i'll se what else I can suggest.

Have you checked the ground lead?

Make sure it is clean, it runs down and bolts to the top right hand side of the crank case.

Sometimes what happens is, that lead gets grime on it, oil or corrosion.. and it doesn't make good contact. The lights, spark ETC load the crank case and frame full of DC.. when you shut the bike off the dc cant flow through the starter so it won't turn over.

after a while the dc trickles out it will let the bike start again.

Hope thats it and it works for you, good luck!!

P.S. how is he liking his ace?? Awsome bike, I have had mine since 1999, and it not about to go anywhere!!

What plugs are you using,did you try a NGK CR8E?.

When you remove the plug,is it wet with black oily deposits or is the plug dry with a black deposit,also check if the plug has a greyish white appearance,is there deposits between the two electrodes....?If you can give more info maybe I can assist.

atach a strap to the front of the bike then pullit slowly pull the clutch in put it in gear then slowly release the clutch

If the spark plug is not getting a spark then you will need to replace the starting coil! the bike wikk start then !...Is the engine getting fule?