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Yamaha MX & Off-Road Dirt Bikes
How bad must you melt a piston before it has to be replaced?
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[QUOTE="2strokerfun, post: 1419151, member: 69719"] I'm convinced that certain engines are prone to pinging and there are times you can only do so much. On the old 490s, reshaping the squish helped immensely, but as you know, they were still finicky as heck, from everything I've read. On my old bike, it is prone to pinging when hot and under a load. Tried every type or jetting/carb change to fix this, but short of head modifications or maybe going to race fuel, probably never gonna go away. Read an old review of my bike the year it came out and that was one of the complaints from the magazine staff back in late 1975. I keep my eye on the piston crown and obviously back off the throttle if the condition develops, but so far, no obvious harm over the years. [/QUOTE]
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Yamaha MX & Off-Road Dirt Bikes
How bad must you melt a piston before it has to be replaced?
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