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How do you repair a Road Rash frame?
Heat pull wrecks a frame if you fill slide gouges with weld. Stitch it and cool between or the frame warps. Do you still have to chase alignment on thin stuff? Grind the high spots first so you don't pile on as much metal. Or just leave the scars if they aren't cracked.
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Check that the wheels still line up and the tubes still sit true before you grind or weld anything. Slide gouges on the outside of a tube almost never pull the frame out of square by themselves, so that look tells you if you even have a structural problem. If the geometry is still good leave the scars. Filling them only puts heat into thin wall tubing, and that is what actually bends a frame. Most of the fancier theories can wait until that check is done.
Leaving the scars stops being the right call when a groove has cut through the wall or you can see a crack. Then it is a structural repair, not a cosmetic fill.
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First thing I'd look at is how much wall you got left under them gouges. On a dirt oval that chassis is gonna take a beating from the ruts and a thin spot will fold when you hit a hole.
Where it sits matters too. A scrape on the bottom rail that drags through the holes wears faster than one on the side, once dirt and moisture sit in there it rusts from the inside and that becomes a crack starter even if it looked ok.
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A scrape on the bottom is usualy a bend too not just missing metal. I reckon a fella ought to check the rail is straight before he even thinks about filling anything.
thin wall tubing still walks when you put heat in it I dont care how careful the stitch is. The hit that made the rash is what knocks a kart out of square more than a little weld does, so you still measure corner to corner on a flat floor even if you leave it alone.
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Road rash on the underside of a rail is almost always abrasive loss of wall, not a crack. The chassis still works as a torsion spring on whatever section is left, so filling the flats does not restore the original stiffness even if you could do it without heat. What weld fill actually adds is a local hard spot plus a heat-affected zone that contracts on cooling, which is a geometry and spring-rate change rather than a true section repair.
A filled epoxy fairing is only a sacrificial skin. Subsequent abrasion removes the filler rather than more of the remaining wall, and with no thermal cycle the repair itself does not create an alignment job. Treat cracks, kinks, and critically thin walls as the structural cases; worn scars that are still sound can be left, faired, or protected with skids.
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