On my Gixxer 1100 after my carb rebuild, I could not get the bike to run at all. It just coughed and sputtered. I didn't want to mess with trying to buy a tool so I took it to a dealer (Enumclaw SKY). Dropped it off in the morning and it was done by afternoon, cost of $80. It helps to talk to the mechanic and tell him what you've done (carb rebuild, new plugs, etc) It ran great and had no other problems. I think I would do it that way again as 1) You don't need to synch very often 2) A decent carb synch tool costs over $50 and you have to buy mercury refills each time ($20-30).