Yes, what Tom says, no lash....This cam timing on a Triumph is best when done with the rocker boxes off, dial indicator on a push rod. Use a hand made wire guide to keep the pushrod alligned as you cycle the engine...You may not be able to get around 100 degrees with just the three keyways. You may need to advance or retard the cam gear one tooth and then try the keyways....Work slowly, and carefully and when frustrated, walk away for a time....