Point-Seven-five
Life time member
Number of posts : 4214
I had the same problem with cracks in that piece that is below the windshield on my RT. It was too thin to try welding or gluing.
What worked for me and has lasted for 5 years now is laminating a patch on the back side. The panel is made of ABS plastic so I used some thickened cement for ABS plumbing. There are two types of cement for these fittings, the regular that is clear and the stuff that is black and thicker. I think it has ABS plastic dissolved in it.
I reinforced the repair with small pieces of fiberglass window screen. Cut the patch to cover the crack and extend about 3/4 inch on each side and beyond the end of the crack.
I started by gluing the crack with Super Glue, applying it along the crack from the rear of the part. Be careful to get the glue just on the crack. Then scuff the area around the crack with fine sand paper. This helps the solvent in the cement soften and chemically bond with the part's surface.
Apply a film of the ABS cement around the crack going about 1" on each side of the crack and put the patch in place gently pressing it into the cement. It takes a couple minutes for the cement to harden so you might need to press the patch into the cement if it lifts up. When the cement is almost cured but hard enough to hold the patch in place put another thin coat of cement on the patch. Repeat a couple times until the screen is covered but still visible in the cement.
Set the repair aside to cure overnight and then reinstall on the bike.
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Present: 1991 K100RS "Moby Brick Too"
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175