Blown up
- Thread starter Sauce440
- Start date
looks like excessive clearance to me, lets see the side of the piston, what was your compression?
definitely looks like an overbored cylinder and a standard piston, just too much space around the piston/cylinder wall leaving nothing but ring to fill the gap
well then you scraped off a few thousands while it was running before the carnage. i have never seen that much of a gap, i dont even think the rings would lock into the locator pins on the piston with that big of a gap. could be the angle of the pic, but thats all i have to go on at this point
i rode it for a couple days like that.when i would start it cold it would make sounds on that sound but once it warmed up it was fine and my dad told me to keep riding it so i did. then yesterday as i was coming home she finally had enough and shut down. so much for my porting
did you just have it ported? maybe who ever ported it didnt taper the port work resulting in the the ring getting snagged
Most likely it is exhaust side. Your lean. Air leak, not proper jetting, mix is wrong??? Have you leak tested recently. I hope after the rebuild you did . What kind of piston? has you air filter fell off, carb to air box not tight? It is colder now and if it was lean before it's even leaner now. Did you rejet for the porting?
Take my word for it, it is melted, increasing fuel in the mix will not rectify pre ignition.
Advance the timing, increase the octane rating.
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