popping and banging
I guess your bike is the watercooled XTZ660? If not, no worries; the following is universal:
1. Get everything back to factory settings in the carb: float level, needle positions, idle mix screw, synchronisation of 2nd carb etc. Mr. Yamaha is definitely not stupid.
2. Check the carb rubbers - the thingies connecting carb with cilinder head. They get old and start leaking air. If leaking, replace. If expensive, and they are, bad luck....
3. New spark plug if not yet installed.
Try again, and use the above status as a starting point for tweaking further. Any aftermarket exhaust will not have that much influence on the running of the engine that major readjustments are necessary.
Laser is OK, but with mufflers for singles SIZE MATTERS, so the fairly small Laser is not the best choice.
Good luck!
Auke
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