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I used to use a complecated device like this one for my BMW r80rt....haven't used it on my GL yet as it's to cold out and the bike is not running..



It is just a section of 1/4 pvc tubing approx 16 ft long ,doubled around and filled with chainsaw bar oil, add a bit of varsol if it is too slow to react.



when the fluid evens out(or very close)while the bike is running at idle and above 2500-3000 RPM.then I would consider the carbs fairly well synced.





For the adapter screws ,local Honda dealer or aftermarket shop..........or make your own.





+1

I made one like this and it works very well -- no need for the fittings on the lines if you're syncing a twin. (of course you need still need the fittings on the intakes)



To reduce the pulsing, you can add an inline obstruction by putting a one-inch piece of the next size smaller tubing in each line. (tip: with vinyl tubing, the ID of a given size tubing is the same as the OD of the next smallest size)
 
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