Having bought a Kawasaki ER5 just over a year ago, no probs with the handling till recent? Going round bends, and riding over where the road has ruts, repairs ect, the bike seems to slide like the tyres are not gripping? More noticeable with the front wheel. In May this year, I did fall off at about 3mph when riding into an unmade road that was muddy and a wheel slipped causing me to "topple over". Perhaps this could have something to do with it? Any suggestions before I ask my local dealer to do a test ride?
Slipping & sliding!
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Sounds like tyre wear
When tyres are new they have a smooth curved shape and the bike rolls into corners. As they wear the shapes change; the front gets slightly triangular and the rear goes a bit square This leads to strange handling, sometimes following grooves/ruts/imperfections in the road, and giving the impression of small slides from the front or rear. It's what people mean when they say their tyres have "gone off". New matched tyres and the bike is "transformed"!
Another option could also be steering head bearings. If they are badly worn - causing notchiness - or lacking in grease - causing stiffness - the symptoms can be similar to badly worn tyres.
check your tyre pressures
Might be knackered suspension - lack of damping will cause either end to skip all over the place.
tyre condition (squaring off, etc), pressures, age. Very old tyres will lose grip.
EDIT: If they're cheap shitty tyres or OE tyres they may be fairly crap to start with and just rapidly getting worse.
Check suspension - ensure the forks are straight and push down on the front of the bike with the font brake on. See if it feels right.
And as above - the steering head bearings. Get the bike on a smooth surface (or if you have the means to lift the front) then turn the bars from left the right slowly and see if there are any notches or irregularities.