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My 2004 ZX-12r started to have some front end shaking after about 6500 miles. Nothing too serious though. When I took my hands off of the handlebars sometimes there was enough shaking that i had to put them back on. I changed to new tires because to old ones were worn (same type dunlop 208ZRs) and the shaking still happens but not all the time. The dealer changed them, not me. I took the bike back to the dealer thinking that the front tire was out of balance. The dealer rebalanced the front tire but the front still shakes sometime.
I did notice that the service tech have to use about 7-8 times as much counterweight to balance the new tire than what was on the rim for the old tire. He claimed that some weight had fallen off when I went back to the dealer to have them take a look at the shaking again. I found that odd that it would take that much more weight to balance the tire. I did notice that at lower rpm the front end doesn’t shake sometimes. Any suggestions a to where to start looking for the problem would be appreciated