First, shoot the mechanic
Then rebuild it yourself, you will learn as you strip the engine. Theres really not that much work involved, you just need to be careful! I got stuck into mine a while ago, replaced all seals at the crank, new water pump, new top end for both pots etc. I now have a "new" engine and all for £160!!
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NSR250R MC21 (NEARLY SOLD!!)
VFR400R NC30 (SOLD)
Santa, please bring me a NSR500 and a SP-2 next year. Pleeeeease....