Refer to
See "cylinder head"
Items 19, sleeve
23, plate
24, screw
The tachometer cable attachment to the head was leaking, and the PO tried to fix it by gobbing it up with epoxy. He replaced the stock screw, item 24, with a huge sheet metal screw, that munged up the threads tapped into the cylinder head. It looked as if he had tried to drill a hole in the pad, and drilled it off-center.
I bought the correct repair parts and installed them. A 5 mm screw didn't catch any threads to hold the lock plate down, so I tried a 6 mm screw. Putting this in cracked the pad on the cylinder head. There is nothing to put a screw in. So now I have two problems:
Short term: I don't know how to hold the sleeve in the cylinder head. Does anyone have any ideas on how to do this? My only idea at this point is to
a) attach a small plate to the frame tubes, directly in front of the sleeve. The plate needs a hole large enough for the tach cable. (b) Put long screws on that plate, on either side of the sleeve. (c) use jam nuts to adjust the screws so that they press against the sleeve.
Long term: It seems to me that the only good long term solution is to rebuild the pad that the screw goes in. So my questions are directed at people who weld. Can this be done? Would it require removing the cylinder head to take it into a shop? Or would a good welder by able to lay down new metal with the engine in the bike? Would it be difficult to find the right composition of rod to build up a new pad? What would the heat do to the head, both if it is on the engine, and if it is removed?
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