• The bolts provided by Zenith (AN 4s) are slightly oversize for the four predrilled holes in the main gear. Dumb question..... Drill or ream the holes to take AN 4 bolts or press for the AN bolts provided.

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Ream is preferred but if careful, drilling is fine.

Before you mount them, though, check the bolt lengths. You didn't spec what you're building, but on my Cruzer (Nov 17 purchase) the bolts were juuuuust a bit too short to allow required 2 threads to show above the nut.  I had to buy the next size up bolts.

Thanks Carl,  will get a reamer and check bolt length.  Building a 650.

If the bolt is just a tiny bit short of the two threads required you can sometimes change from a standard washer to a light washer to gain the small bit that you need.  Just another possible option......

Not that it really matters, but in the interest of accuracy:

Hi, Ken;

Please realize I'm smiling while I type this; I'm just having some fun and taking nomenclature to a stupid level. 

You cite an ADVISORY circular.  From the Construction STANDARDS written by Chris Heinz, he spec's TWO threads.  So I'll see your AC and raise you a standards.  ;-)

I beg to differ. I quoted THE BIBLE.

But in this context an AC is guidance, not a requirement. When you purchased your kit, Zenith stresses to follow the plans and their standards over others referemces. Zenith *requires* two threads.

And from the AC43-13 description page on the FAA website, "This advisory circular (AC) contains methods, techniques, and practices acceptable to the Administrator for the inspection and repair of nonpressurized areas of civil aircraft, only when there are no manufacturer repair or maintenance instructions. " 

Note the last part of the sentence. Zenith provides standards and instructions, so they trump the AC.

I'll confuse this a little further.....  

At what position must there be one or two threads showing?

Once a single thread just emerges from the stop nut, one would need to rotate another 360 degrees for one thread to be visible for 360 degrees around the stop nut.  If one did this, and therefor displayed one thread all the way around the nut, wouldn't that lead to two threads being visible at the place where the first thread emerged (but not all the way around the nut)?

Okay. You win. Never really believed in The Bible anyway.

One thing I forgot to mention earlier, Byers, is that if you are mounting wheel pants, you'll be placing the shim for the inner mounting plate between the caliper and the MLG.  Please realize I'm building a 750 and you have a 650, so I'm completely ignorant of YOUR plans. This may not even apply, or you may not be using the fairings.

No pants for my 650.  But will ensure two threads exposed on the end of the bolt having added at least one washer under the nut .  I think that complies with the construction standards. 


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