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I have what i call a bastard bike!! It's a 71 frame & 67 engine...I want to add a tech, but not sure which one to get...I'm assuming that the 67 would need a tech & cable with CEI threads.
Plus i'm told that the tech gear housing on the engine is different after 67..The 67 has right hand threads, and the 68 & up have left hand threads...Not sure what's right & what's wrong??

Any help would be appreciated, Cheers
 

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I don't know if this will help. I just went to look at the tach drive out of my 68 T-120. It is a right hand thread. I was told it was suppossed to be a left hand and probably nearly broke it trying to get it out until I turned it the regular way.
 

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After '68, the tach drive threads into the case left-handed. 500s use a slightly shorter tach drive case than the 650 / 750. Dunno if a 500 drive will work on a bigger motor, but the bigger one will NOT work on a 500. The drive gear doesn't reach the camshaft.
 
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