Ive never seen a cam without the pin. My 3TB cams have it. I have a spare cam from a 2003 TTR600 and it also has the pin. Camshaft part number prefix of 1JK. None of which had tachos. Only ever been the one cable drive tacho system on all the 600 derivatives. You may have an early TT600 cam as they had a different part number prefix of 34K as compared to the XT cams of the time that had tachos with 43F prefix on the camshaft number
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