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  1. #11

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    The cylinders where the skirt is shorter are cylinders where a portion of the skirt on the intake side have been shortened for better performance by a hotrodder, also check the port height of the exhaust port to the top of the cylinder the ported cylinders have a shorter port height than a non ported cylinders, also the width of the ported exhaust cylinders are wider. All you have to do if all port heights are the same is just cut the one cylinder with the long skirt it to cut it off carefully with a hacksaw to match the two short skirt cylinders, also most ported cylinders by Lowle Horning have a LH and a number stamped on the cylinder some where.

  2. #12
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    AGAIN THESE look like UNTOUCHED OEM CYLINDERS AND THEY ARE NOT CUT OR MODIFIED. The bottom of the cylinders are cast this way.

    No porting has been done ports are the same height in all cylinders and there the same distance from the top of port to top of cylinder. You will notice though that the webbing for the ports is thinner and more streamline on the two outer cylinders. But all cylinders are oem gp1300r
    Last edited by Gpwink; 04-24-2020 at 01:46 PM.

  3. #13

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    the two out side cylinders are modified and the center one is stock. I feel pretty sure what I am posting as I have built over 40 of these motors over the years.

  4. #14
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    Ok after I carefully examined the cylinders I do see where the casting finish is smoother but none of the internal cylinder ports are changed. I just see where the bottom of the cylinder port webbing and the skirts have been modified. Who ever ported this cylinder did a perfect job allmost like CNC work and they must have sandblasted there port work. But I'm telling you this looks LIKE oem casting. There are no markings that I can see that were put on the cylinder. I'll just port this cylinder to match the others

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    What gave it away for me is where there is NO large chamfer where the piston and rings slide past when installing. The factory usually has a large chamfer at the bottom of cylinder skirts. Thanks for your help.
    Last edited by Gpwink; 04-24-2020 at 01:49 PM.


  5. #15

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    Glad to help, I agree nice job and then glass beaded I think also. One thing you need to check be sure all three cylinders are exactly the same height from base of cylinder to top , just to be sure the two modified cylinders have NOT been decked in height .

  6. #16
    Ok 2fast4u. Thanks for the heads up on the deck height. So far it just looks like it was smoothed up for a more efficient intake charge.

  7. #17
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    This is a ported 1200 cylinder by Judge ,note the finish is rough . What is the exhaust port height on the 1300 power valve cylinder by the way ? I know the 05-08 cylinders are 42mm down from the deck height . The 1200 exhaust ports are 40mm down from the deck height and the 66E 800 cylinders are 38mm down .
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