Got pretty scared this morning when I heard a few nasty crunching noises and my rear wheel lock! Luckily didn't drop it and came to a stop, killing the engine with the switch.

Was recovered and the garage thinks it's something fairly serious inside the gearbox and they'll need to rebuild the engine...potentially costing me �1000.

Just looking for advice really on what to do. The bike is a 59 plate XT660X with 16k miles, good condition with aftermarket exhausts.

My two options are

- Pay whatever the bike shop quotes me (�800-�1000)
- Part ex it at a Yamaha dealer in its current state (not sure on value of bike but they did quote �2000 part ex value about 6 months ago).

I'm desperately hoping it's nothing too serious but unfortunately looks like it could be,

I appreciated any advice.