08-31-2018, 09:24 PM
(08-31-2018, 07:42 PM)Blaine Young Wrote: Item number 163217794445 (Mcculloch Mc-93 Kart Engine) on ebay says in the description that several "low places" in the cylinder bore were brazed. Has anyone ever tried this. It sounds like a formula for disaster, but I don't know anyone who gave this a chance.
it's a very common repair when needles get loose and create grooves up the bore. Many different fillers have been used such as silver solder, silicon bronze, mild steel and even epoxy. Welding up grooves in cast iron with something like mild steel or cast iron rod is very hard to get right as it requires the base metal to melt. Using silicon bronze or silver solder only requires bringing the base metal up to red hot but not melting so it works better once you get to the re-bore phase. Not many people around these days that have the skill set to do the repairs. I've run several blocks that have been repaired and they run fine.
Steve O'Hara