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1970 Yamaha CT1B Front Fender
I have a 1970 Yamaha CT1B and was working on the fenders to get ready to paint them. The front fender is from a 1970-1972 175. I'm not sure what year. Does anyone know the material this is made from? I would assume it is made from aluminum, zinc, or magnesium, because it is not rusted, unlike the rear fender. I ask this because I was using a propane torch to get a few dents out, and it melted a hole right through it. Would I be able to do some sort of welding, such as TIG? Or would my better option be to use fiberglass or Bondo over it?
The rear of the front fender
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Most Yamaha Enduro front fenders were made of aluminum until the 1971 models came out. You can tell if it's made of aluminum or steel, by using a magnet.
Also, the earlier aluminum fenders had their mounting brackets riveted on, and the later steel fenders had spot welded mounting brackets.
As for repairs, there's a product (aluminum brazing rods) that I've used before, that might work well for you. Follow the manufactures instructions, and I suggest some practice brazing on a similar thin piece of aluminum first . . . metal must be very clean, and scratched up with some fine sand paper (400 ~ 600 grit), or use a "clean" stainless steel wire brush. . . . even your fingerprints from handling the fender can effect the outcome of your repair job.
Ohhh .... and use a temp gun to make sure you don't overheat the fender...
In other words, no higher then what the recommended melting point is of whichever brand of rod you choose to used. (roughly 750 degrees)
Watch this U-TUBE video . . . https://www.youtube.com/watch?v=fKIKsDfRAcs
Good luck
Dave/Enduronut