awhile back while trying to start the bike the kick starter hubg up and would not move. I removed the plug and pushed the bike around and could hear the piston moving up and down. Fifth gear had been an issue so the thought was something had happened there. The bike was taken to a shop where I dont have much trust, taken there by son. Anyway, the owner of the shop has informed me that the crank needs replacing as well as a couple of gears. Cost would be $1600 - $2000. Does this sound correct?