I recently purchased a 2015 Norge 8V. At the time of purchase while the mechanic was test riding the bike the left cylinder stopped firing. The plug was changed correcting the problem. I passed it of as "bad gas" since it had been at the dealer a long time. Fast forward 3 months and 2500 miles and the same cylinder stopped firing and the plug appears fouled. Up to this point, the bike ran great getting 47-50 mpg. Tune up was performed @ 1700 miles so I am surprised it would be a tuning problem already. Thank you in advance .