jasper's YZ
Member
- Sep 22, 2007
- 26
- 0
chevyss_98 said:weird man, never had that happen before, ive had circlips disappear..., im in mechanical engineering, my final semester and trust me, cast blows chunks, its garbage
jasper's YZ said:Went to rebuild my top end in my 2000 yz 125 and was examining the piston and noticed where the 2 ends of the ring meet the pin was gone. Looked at my jug and the was a nice gouge in it. Has anyone experienced this before? It was an oem cast piston. Brought it to the machine shop and we looked at it again and on the front side the bridge that seperates the 2 ports has a wave in it. He thinks that may have cause the ring to jump and put pressure on the pin? Any way it has a sleeve in it and I am going to bore her out. Just wanted to see if any one experienced this before.
Matt
This has nothing to do with the pin falling out. As Rich stated it is probably another underlying problem that caused the pin to come out, and that will need to be corrected in order to ensure the problem doesn't happen again.souphmars said:there is nothing wrong with oem or wiseco pistons, but wiseco pistons which are forged, are stronger than oem pistons
chevyss_98 said:weird man, never had that happen before, ive had circlips disappear...you can imagine what happened after that, but anything is possible when your dealing with 2 strokes, lotsa crazy stories, shove a wiseco forged piston in there, lot stronger than oem, cast is really bad for letting chips of metal off, im in mechanical engineering, my final semester and trust me, cast blows chunks, its garbage
+1BigRedAF said:Last time I checked every bike made and sold at your local dealer came with an OEM piston and ran fine.
It's lack of maintenance, running a worn piston in a bike that sucked dirt or improper repair that causes the piston failures that I've seen.
I'm not trying to rag on you, I just don't think the fact that the guy had a cast piston in his bike was the cause for the pin to come out of the ring groove. And yes, forged pistons are stronger than cast pistons, absolutely.chevyss_98 said:everyone seems to be ragging on me, not quite sure why, im not saying im above everyone by being in engineering, ive just studied these manufacturing processes under the microscope, the reason forged is stronger is that the grains of metal are elongated in a pattern that makes it so stress cracks are EXTREMELY hard to be developed from repeated loading and basically are never noted unless there is a fluke in the material
besides, i had a cast piston break off at the top and go out my exhaust before because i had a hung ring, im speaking from my experience, not just jabbering on about my schooling, im just using my education to back up the fact that forged is better
ever wonder why your ratchet is drop forged and not cast??? lol unless you get your tools on clearence at biglots or k-mart lol
OEM pistons can be fine as long as you monitor it, im just saying personally with my experience on my first bike, it just cost me alot for machining costs, so since then ive gone with forged since my negative experience with cast
sorry if i offended anyone
BigRedAF said:By the way, I think they're full of crap and the Navy shot it down
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