I have a 1981 Suzuki 650GL that I just finished doing the 7K shim adjustment to. I am trying to seat the tachometer drive gear back in its place and it will not seat into the engine deep enough. It is off by the end distance to the gear telling me it is not pushed into the hole on the other side of the worm gear in the engine. It pulled out just fine, why won't it go back in? Does the engine drive line need to be rotated one way or another? I have the service manual, however, it is no help, it just says reinstall drive gear. Any assistance greatly appreciated.