'93 XTZ 660 loses engine power
Recently bought the bike from e-bay for a trip to Norway. All seemed fine (although it is on a Q plate as it has been rebuilt). Took it into local bike mechanic who gave it once over and said it was ok. He suggested that the cam chain and tappets might need adjusting eventually but were ok for the moment.
After riding around for a bit- engine very strong and everything fealt lovely, I thought i would stretch her legs... got up to fifth gear 5000 Revs and about 55/60 mph and the engine loses power. It sounds like it is still turning over but this slowly decreases. Drop down a gear and still no improvement so do this again. Then the rear wheal locks up for 1/2 a second (enough for full pants) and the engine stops completely. Bike rolls to a standstill. I turned the ignition off and then back on and she starts up first time, turns over fine and power is back. Obviously took it much easier.
I have repeated the heavy acceleration a few more times to try and see when it is the problem occurs. If acceleration is gentle up to 60 it seems ok but once high revs are reached the same occurs. Only seems to be 5th gear though.