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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lucas KVF Rebuild - UK Recommendations?
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<blockquote data-quote="Cyborg" data-source="post: 179023" data-attributes="member: 3426"><p>Thanks for the reply. I think I ended up between 8 and 10 degrees after ( on #1) and spark at kicking speed while retarded seems ok, This is on a KFC mag that I converted for the Vincent. I used a slack wire advance setup, which has caused me to become an outcast, but that’s another story. I needed to sort out the internal timing because I had to convert a KVF points cam to the KVFTT style. To find the flip point, I used a LCR meter, which was recommended by a fellow member who understands these things. Basically… the meter sends a low voltage signal through the winding and measures what comes out the other end. At least that’s how I understand it. The meter is a cheap Chinese version and its accuracy is unknown, but it doesn’t matter if the readings are off a bit because you are only looking for the highest reading.</p><p>Anyway… I’m thinking I would be better off if I advanced the internal timing some more in order to make #2 spark a little fatter when retarded ( via the lever) for starting. I wish there was some way to accurately measure that sweet spot. All I have for that is a home made 2 pole spark gap. I don’t think I’m any clearer on the eccentric grub screw. Without some sort of tool to accurately measure the output, that grub screw seems redundant to me. I wish I could talk to the fellow from Lucas who actually adjusted those things for a living.</p><p>The meter (at least this one) doesn’t respond instantly, so you can’t just turn the armature by hand. Mine was set up in the lathe so it could be turned a degree or 2 at a time. You can nail down the flip point exactly. It‘s as slick as snot on a doorknob! For locking the armature in that position, I use a set screw made of Delrin that replaces the ground brush.</p><p>That thing hanging off the side of the lathe is a DC motor from a treadmill. Just drives the chuck with a belt so I can vary the speed to what Lucas recommends.</p><p></p><p></p><p>[ATTACH=full]62038[/ATTACH][ATTACH=full]62039[/ATTACH][ATTACH=full]62040[/ATTACH]</p></blockquote><p></p>
[QUOTE="Cyborg, post: 179023, member: 3426"] Thanks for the reply. I think I ended up between 8 and 10 degrees after ( on #1) and spark at kicking speed while retarded seems ok, This is on a KFC mag that I converted for the Vincent. I used a slack wire advance setup, which has caused me to become an outcast, but that’s another story. I needed to sort out the internal timing because I had to convert a KVF points cam to the KVFTT style. To find the flip point, I used a LCR meter, which was recommended by a fellow member who understands these things. Basically… the meter sends a low voltage signal through the winding and measures what comes out the other end. At least that’s how I understand it. The meter is a cheap Chinese version and its accuracy is unknown, but it doesn’t matter if the readings are off a bit because you are only looking for the highest reading. Anyway… I’m thinking I would be better off if I advanced the internal timing some more in order to make #2 spark a little fatter when retarded ( via the lever) for starting. I wish there was some way to accurately measure that sweet spot. All I have for that is a home made 2 pole spark gap. I don’t think I’m any clearer on the eccentric grub screw. Without some sort of tool to accurately measure the output, that grub screw seems redundant to me. I wish I could talk to the fellow from Lucas who actually adjusted those things for a living. The meter (at least this one) doesn’t respond instantly, so you can’t just turn the armature by hand. Mine was set up in the lathe so it could be turned a degree or 2 at a time. You can nail down the flip point exactly. It‘s as slick as snot on a doorknob! For locking the armature in that position, I use a set screw made of Delrin that replaces the ground brush. That thing hanging off the side of the lathe is a DC motor from a treadmill. Just drives the chuck with a belt so I can vary the speed to what Lucas recommends. [ATTACH type="full" alt="IMG_4995.jpeg"]62038[/ATTACH][ATTACH type="full" alt="IMG_4999.jpeg"]62039[/ATTACH][ATTACH type="full" alt="IMG_5002.jpeg"]62040[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lucas KVF Rebuild - UK Recommendations?
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