my kxf 250 its a o5 model wont start,it wont start of the kick or bumping it now,wen i go 2 kick it theres nuffin there but sumtimes it back fires n sumtimes theres a lil bit of compression there,ive changed spark plug n still wont go,i dont know much about them realy just wondered if some 1 could give me sum advice,thx

james stanley, January 2008

Have some 1 check the valve clearences..if everything is ok then get it to a garage to get it rebuilt..4 strokes r expensive and take alot of looking after..get uresen a 2 stroke son

Marris, January 2008

hi your bike neads a top end rebild piston kit,valves,mite nead timing chain.I have rebilt lots ov 4 strokes with the same problem as yours.

phil, January 2008