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  1. Very early '38 Knuckle/BT Flathead frame question

    I just acquired a frame I plan to use for my 38UH108x Flathead, and I'm surprised to find it has the 2" wide braces for the seat post. It has the 1" upper frame strut for the neck and the front...
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    1920 Exhaust Valve

    Does anyone know if the S.P. on this 1920 exhaust valve has any significance? 21654
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    That is correct.

    That is correct.
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    1920 Motor Number Question

    On a 20 J motor, what does the "E" mean at the end of the number? Does it denote the "fast" motor, or is that "E" stamped elsewhere? Thanks in advance.
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    Also, the M-74B uses an entirely different main...

    Also, the M-74B uses an entirely different main nozzle which supplies more air to better emulsify the fuel. Therefore, a fixed main jet was added to balance out the fuel.
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    Amazingly, I was still able to get some from a...

    Amazingly, I was still able to get some from a dealer a few years back, but it's unlikely now. In a pinch, you can glue them to a surface grinder and take them down to size! Use a little lacquer...
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    As kg993 mentioned, aftermarket gaskets are too...

    As kg993 mentioned, aftermarket gaskets are too thick. Stock are about .007" and replacement are often .020" thick. This is equivalent to drilling a 1/8" hole to nowhere in you pump!
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    When you get it apart, look at the nuts to see if...

    When you get it apart, look at the nuts to see if they are original or aftermarket. Originals used a brass washer to seal against the rocker box, and aftermarket are cut for an o-ring. I've found...
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    Give it a shot, it's not like you're doing...

    Give it a shot, it's not like you're doing anything irreversible!
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    You definitely want someone intimately familiar...

    You definitely want someone intimately familiar with Knuckle heads, as there is a multitude of things that can be done wrong on them. Valve height, travel, and guide clearance are all critical, and...
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    The pinholes were factory, and are about.055" in...

    The pinholes were factory, and are about.055" in diameter. The front intake and rear exhaust tins are the same stamping, but the intake has the pinhole and the exhaust has a noticeably longer tube...
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    It gets expensive buying the sets. I find this...

    It gets expensive buying the sets. I find this one works well if you can get them.

    http://www.nisbearings.com/catalog/product.php?prod_id=7540
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    I've been haulin' a hack for 30 years with my '46...

    I've been haulin' a hack for 30 years with my '46 Knuck, and I've probably logged close to 90k miles. My kids and exes and present company have logged many miles with me, with no complaints. Only a...
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    Very nice work! It just goes to show, with some...

    Very nice work! It just goes to show, with some imagination and a lot of elbow grease, you can still build a presentable ride without spending a large fortune.
  15. That's not a bad idea. You can also connect to...

    That's not a bad idea. You can also connect to the fittings on the rocker boxes where the cup drain lines connect. I don't know how much vacuum you'll get, but I think 5 - 10" HG would be plenty.
    ...
  16. Good info Steve (as always). I would not under...

    Good info Steve (as always). I would not under any circumstances restrict the oil flow to the rockers. If you have loss due to worn parts in one area, you will starve other areas by restricting...
  17. You should start with the simple things first. ...

    You should start with the simple things first. Check the oil pressure with a gauge. Many of the aftermarket pressure relief springs are too heavy and cause too much oil to be delivered to the top...
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    You might try both to see if one gives a better...

    You might try both to see if one gives a better fit on the gear. I'm convinced the factory hand selected gears for correct backlash, as original motors always seem perfect, whereas those assembled...
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    '36 - '40 had the forward swept rear leg. Only...

    '36 - '40 had the forward swept rear leg. Only the offsets on mid '46 - '48 (optional '49) were kicked to the rear.
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    That indent on the left tank doesn't look very...

    That indent on the left tank doesn't look very clean. I wonder if someone hammered in a Knuckle tank to fit a Pan.
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    I've been setting the valve height at 1.560"...

    I've been setting the valve height at 1.560" above the shoulder. The Pan spec of 1.500" is too tight with stock valve guides, and there's a risk of bottoming on the guide. The Kibblewhite guides...
  22. I don't recall where, but I remember reading or...

    I don't recall where, but I remember reading or hearing it took 14 swaging operations to form the legs. Perhaps it was the '38 tour book. Chris?
  23. The front mount forging on a Knuckle is 3/8"...

    The front mount forging on a Knuckle is 3/8" taller than a Pan mount. The only clean way to do it is replace the mount.
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    Two reasons not to convert: The lower tree on...

    Two reasons not to convert:

    The lower tree on an offset is also offset 1/8" in the opposite direction, an inline is not. This doubles the effective derake angle.

    If you offset an inline, the...
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    Before I'd try to alter the frame, I'd alter an...

    Before I'd try to alter the frame, I'd alter an old axle to change the angle of the wheel. That would allow you to determine if this is the cause of the pull. You can make a mess out of a good...
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