light knoking sound

[NES07DEZ]

Hello guys,
i just did a valve adjustment on my 1982 850 l
when i was done i notice a light,light knoking sound coming from the left side of the engine.
what could this be do i need to sync the carbs? how do i sync the carb?
thanks

[almarconi]

It is not uncommon for the valve train to be noisy after an adjustment. As the valves become tighter the engine will run quieter. Once properly adjusted the valve train will have a sound similar to a sewing machine.

If your carbs have not been synced they should be vacuum synced. Not difficult to do but you need either a morgan carbtune or mercury sticks to do the job.

[GSGSXman]

Yes sync the carbs so that the engine will run smoother. An occasional light knocking sound might be from the cams moving around.

I would be more concerned about a continuous knocking sound especially if the engine didn't make this sound before the valve adjustment.

[redsoxvw]

This might be way off, but just for giggles put your ear to the gas tank when the bike is knocking. I had a mystery knock appear from out of the blue and it was the Petcock knocking.......Im not sure if your year has a vacuum operated petcock or not (Someone with more experience will be able to tell you)....worth a shot right? Good Luck