Transmission cradle .120 wider then engine boss

I am assembling my engine/ transmission to frame. This is a "bitza". It is an 74 850 engine and trans, the cradle is unknown. The cradle seems to be .120 wider then engine and transmission width. Did the factory just tighten bolts until it was tight? I can shim it to my advantage for alignment but curious what the factory did.

What's the measurement between the plates near the Iso. tube?

3.333 inches at boss 3.456 at engine. Guess I answered my own question, tighten till gap is gone?

Make sure you include the 1/8th spacer to the top lug of the gearbox to the inside of the cradle.

mean gene said:

3.333 inches at boss 3.456 at engine. Guess I answered my own question, tighten till gap is gone?

Click to expand...

Yes, but one check first. Your cradle is wider at the engine end than the ISO end. It should be parallel and there is normally only a small amount of slop at the engine. You measured almost 1/4". That's fine if it is simply spread. However, if only one side is spread, you may introduce a slight crooked engine and gearbox related to the ISO and swingarm. So, try to see if you have the same degree of spread on each side. In other words, each side should be 90 degrees to the ISO. If both are say 92, no problem. But if one is 90 and the other say 94 it could be a bit of the problem. Probably not critical but if one were 88 and the other 92 it would indicate that the cradle when though something like a crash. (numbers just "for instance", no magic to them).

Checked cradle with a machinist square from the ISO boss, both sides spread about the same. Thanks for the reminder on the left side trans spacer.