jaybar6
XS650 Addict
the engineer had too much saki on Friday.
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Second XS650, 1977 Standard
- Thread starter FrankS
- Start date
Just let me clarify something here - the spot where you set the points gap, where the points are open the most, won't line up with the "F" mark. It won't be anywhere near it, and it's not supposed to be. It's simply the spot where the points are open the most, and there's no mark to align with for it. The "F" mark (or "range" actually) is where the points just start to open and where they fire. They won't even look open at all at this spot, and you won't be able to see it (a gap) with the naked eye. This is why you need to hook up a small 12V light bulb to the points set for static timing, to "sense" the spot where the points open electronically. I use an old instrument bulb and socket with alligator clips on the ends of the wires. I made the wires long enough so the bulb hangs down right next to the timing marks on the alternator housing. That way I don't have to take my eyes off the marks as I rotate the crank to see when the bulb lights up, it's in my same field of view.
What 5twins says, but I use a multimeter instead of a bulb. Both ways work to determine the point of opening, when the plug fires.
jaybar6
XS650 Addict
put the rods side by side to see how far out the quality control is out? It looks like 5 degrees. one would think that all xs's would be the same. If the quality control is exact every time, one would not need to adjust at all.
My money is on either a cam chain that needs adjusting. Or a cam chain worn to the extent the ignition is retarded to the stage where the available adjustment on the points back plate isn't enough.
Last edited:
FrankS
XS650 Addict
Update: Both points cam rods are the same. Previous owner mislocated the lobe with a black marker dot.
jaybar6
XS650 Addict
so, the quality control is a good standard between different bikes. well done Yamaha.
