i have an 02 sportster XL1200 after the engine warms up i hear a clicking sound if i shut off the engine then restart it shortly after having turned it off.i was wondering if anyone is familar with this problem and if so how do i fix it.The engine also will sputter or backfire sometimes when starting the engine cold is this normal for Harley.i,m new to the world of harley so i,m just trying to get some feedback on all of this.i was thinking it might be the timing but i,m not sure if that is the trouble or not .thanks for any insight in this.