Is this normal piston ware for only 1 1/2 yz250 rebuild

Toby_Blevins
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Toby_Blevins
Edited Date/Time 10/5/2019 9:20pm
Is this Normal piston ware for only one and a half hrs on fresh rebuild wiseco p iston. My friends say it looks ok.. but idk not to sure starts good runs good
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JB500
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JB500 10/4/2019 8:38pm
10/4/2019 8:38pm
chasestevenson599 wrote:
That's a hard NO
I second that with a harder “no”.
garagedog 10/4/2019 8:46pm
10/4/2019 8:46pm
bad news right there
Chance1216
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Chance1216 10/4/2019 9:44pm
10/4/2019 9:44pm Edited Date/Time 10/4/2019 9:48pm
I think you need some new friends. That's a solid NOPE. I'd be concerned about the shape of the cylinder as well.
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Helda
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Helda 10/5/2019 2:18am
10/5/2019 2:18am
Lol I second that you need new friends hahaha
mxsixty
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mxsixty 10/5/2019 4:30am
10/5/2019 4:30am Edited Date/Time 10/5/2019 4:32am
I'm impressed you actually sprayed degreaser into the exhaust port and on the piston before hoseing it all out with water so people can get a nice clear pic to diagnose the problem?...

Impressive!...
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Toby_Blevins
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Toby_Blevins 10/5/2019 5:07am
10/5/2019 5:07am
Helda wrote:
Lol I second that you need new friends hahaha
They always say...send it lol I'm like dude that is why your bike always fucking up and never sends shit but pistons to hell. I know what's wrong tho.. the cylinder is fucked like I expected before putting it back together and needs replated. Im going to take it back apart and rebuild it correctly. I'm going to send my crank off to be balanced then I'm going to send my cylinder with new piston off to be re plated and matched to piston size...
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Brad460
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Brad460 10/5/2019 5:54am
10/5/2019 5:54am Edited Date/Time 10/5/2019 5:56am
I am with your friend on this one...ware on the iston looks fine.
twade220
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twade220 10/5/2019 7:05am
10/5/2019 7:05am
Looks like crank seal leaking and sucking air
Chance1216
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Chance1216 10/5/2019 11:40am
10/5/2019 11:40am
mxsixty wrote:
I'm impressed you actually sprayed degreaser into the exhaust port and on the piston before hoseing it all out with water so people can get a...
I'm impressed you actually sprayed degreaser into the exhaust port and on the piston before hoseing it all out with water so people can get a nice clear pic to diagnose the problem?...

Impressive!...
Wow, I didn't even catch the water in there. He should be fine if he re-seats the rings with gorilla glue, and uses
WD-40 to help disperse the water.
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Toby_Blevins
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Toby_Blevins 10/5/2019 2:59pm
10/5/2019 2:59pm
mxsixty wrote:
I'm impressed you actually sprayed degreaser into the exhaust port and on the piston before hoseing it all out with water so people can get a...
I'm impressed you actually sprayed degreaser into the exhaust port and on the piston before hoseing it all out with water so people can get a nice clear pic to diagnose the problem?...

Impressive!...
Chance1216 wrote:
Wow, I didn't even catch the water in there. He should be fine if he re-seats the rings with gorilla glue, and uses WD-40 to help...
Wow, I didn't even catch the water in there. He should be fine if he re-seats the rings with gorilla glue, and uses
WD-40 to help disperse the water.
Lol.. I will make sure to do that
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Chance1216
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Chance1216 10/5/2019 4:11pm
10/5/2019 4:11pm
mxsixty wrote:
I'm impressed you actually sprayed degreaser into the exhaust port and on the piston before hoseing it all out with water so people can get a...
I'm impressed you actually sprayed degreaser into the exhaust port and on the piston before hoseing it all out with water so people can get a nice clear pic to diagnose the problem?...

Impressive!...
Chance1216 wrote:
Wow, I didn't even catch the water in there. He should be fine if he re-seats the rings with gorilla glue, and uses WD-40 to help...
Wow, I didn't even catch the water in there. He should be fine if he re-seats the rings with gorilla glue, and uses
WD-40 to help disperse the water.
Toby_Blevins wrote:
Lol.. I will make sure to do that
Here's my piston on my 01 CR 250 at 27 hours. I replaced it as a little dust managed to get inside my cylinder. I swapped out my carb in the dark and didn't get the boot on right. Very hard tight spot to get to. I had the same scoring on my cylinder as the piston. It ran fine. It started fine. I strip my bike down after each ride and caught it. It cost me a replate on top of a new piston. Mine isn't as bad as yours. So no, I wouldn't ride it as is. .
SLOWTIME
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SLOWTIME 10/5/2019 9:20pm
10/5/2019 9:20pm
Toby_Blevins wrote:
They always say...send it lol I'm like dude that is why your bike always fucking up and never sends shit but pistons to hell. I know...
They always say...send it lol I'm like dude that is why your bike always fucking up and never sends shit but pistons to hell. I know what's wrong tho.. the cylinder is fucked like I expected before putting it back together and needs replated. Im going to take it back apart and rebuild it correctly. I'm going to send my crank off to be balanced then I'm going to send my cylinder with new piston off to be re plated and matched to piston size...
The whole “send it” thing is played.
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Toby_Blevins
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Toby_Blevins 10/5/2019 9:23pm
10/5/2019 9:23pm
Chance1216 wrote:
Wow, I didn't even catch the water in there. He should be fine if he re-seats the rings with gorilla glue, and uses WD-40 to help...
Wow, I didn't even catch the water in there. He should be fine if he re-seats the rings with gorilla glue, and uses
WD-40 to help disperse the water.
Toby_Blevins wrote:
Lol.. I will make sure to do that
Chance1216 wrote:
Here's my piston on my 01 CR 250 at 27 hours. I replaced it as a little dust managed to get inside my cylinder. I swapped...
Here's my piston on my 01 CR 250 at 27 hours. I replaced it as a little dust managed to get inside my cylinder. I swapped out my carb in the dark and didn't get the boot on right. Very hard tight spot to get to. I had the same scoring on my cylinder as the piston. It ran fine. It started fine. I strip my bike down after each ride and caught it. It cost me a replate on top of a new piston. Mine isn't as bad as yours. So no, I wouldn't ride it as is. .
Yea.. I think cylinder was not tightened down correctly because it was leaking around seal but I fixed that.. also it was out of time bad and cylinder had a little piece of the coating chipped off of it so I think that's probably what's happening
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