I Have An Xt600 [84] Going Along Suddenly No Forward Motion.....chain Ok,sprockets Still On But No Engage On Gears ...i Am Assuming Some Thing In Gear Box Has Broke.....has Any One Had The Same And Advice Would Be Very Gratefull.....sounds Like Its Gonner Hurt My Walllet......cheers Dave FORGOT TO SAY WHEN YOU PULL THE LEVER IN NUETRAL LIGHT GOES OUT BUT STILL NO ENGAGE ON ANY GEARS..

Assuming that it's not the clutch?

If the bike goes up & down through the gears okay but stil doesn't go forwards, it could be that the gearbox output shaft (countershaft) has lost its splines that drive the front sprocket? Happened to me twice on a DR600, heard of it happening on a KLR as well.

Easy to check: look at the front sprocket with the engine running whilst in gear, if the shaft's spinning but the sprocket's stationery, spline's have gone.

Fixing it entails a full stripdown as the shaft resides inside the cases. You'll need to load the gears on to a new shaft & budget for a full gasket set etc plus who knows what else on a bike of that age? May be cheaper to buy another engine if you can't do the work yourself?

thanks for that steve...looks like it will be a split job as the bike has already had a 98cc conversion and titanium valves cr 35 carbs....so unless any one can recommend any thing engine wise, that is simular....will have to strip this motor down......