I put a dyno jet kit and K&N filter on my otherwise stock cbr900, and sync'd the carbs. Then someone offered to sell me a micron exhaust, which I installed, and then changed the main jets from 118 to 122. My question is do you guys think it's necessary to sync the carbs again? Thanks in advance for any advice.

 

yes...you should sync the carbs again.

 

I took your advice Tahoe- they were all still in spec, but now they're right on the money again. I'm glad I checked them though, because if I didn'tit would have bothered me!

 

you mean before they weren't on the money?!?!

 

There were on the money after I sync'd them before, but then I changed the exhaust system and main jets. I checked them again last night, and they had changed slightly, but were still within 1 in/hg of each other, which is the factory spec. Now I have them all exactly the same again. Too much snow and ice for a test ride though!!!

 

You shouldn't have too sync the carbs after changing the jets.

 

true that you shouldnt, but I see it as it never hurts to check such things and ensure that they're synchronized properly.