On a FM-X4 mag the fiber dist rotor gear won"t jump a tooth in the mag but it could shear some teeth off or the fiber gear could turn on that shaft. I have seldom seen the gear turn on the shaft look closely if that"s what you are talking about it probably has teeth sheared off. Internal engine gears you have teeth stripped off, keyway tore out or a broken cam shaft it didn"t jump a tooth internally without something being way worn out or broke inside. Instructions link below is for timing a FM J mag but same applies for a X mag but the gear is mounted on breaker bearing bracket instead of the cover cap and you align the "C" mark up with a mark or beveled tooth on the metal inside the mag for CW drive mag on AC engine.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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