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Author Topic: Original piston?  (Read 3328 times)

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Offline JaredRM250

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Original piston?
« on: May 30, 2013, 10:57:23 AM »
This isn't in its peak I don't think! HA

« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline JaredRM250

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Original piston?
« Reply #1 on: May 30, 2013, 11:00:23 AM »
Anyone know what caused all the pitting and black deposits? or just High hours?

Any feedback greatly appreciated.

Cheers,
Jared
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Jeram

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Original piston?
« Reply #2 on: May 30, 2013, 11:33:50 AM »
Quote from: JaredRM250 on May 30, 2013, 05:57:23 PM
This isn't in its peak I don't think! HA



the surface finish would either suggest youve cleaned it, its new, or its running rich (not hot enough for carbon build up)

but contradictory, it seems that there is detonation marks around the perimiter of the dome which suggests your running too lean, too much advance, too high compression or ****ty fuel. Or a combination of any of those.

so perhaps during this pistons life it has encountered detonation at one point (deto marks but not regular enough for carbon build up) but for the majority of the time she runs rich
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline JaredRM250

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Original piston?
« Reply #3 on: May 30, 2013, 11:40:41 AM »
Well I bought it used and im very generous with oil so the richness is my doing. New piston is going in while its in the shop. I have been informed that the cylinder will need replating next time though! :(
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline SachsGS

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Original piston?
« Reply #4 on: May 30, 2013, 02:49:28 PM »
Some "light" reading on the subject. :<img src=" title="Roll Eyes" class="smiley">      www.contactmagazine.com/Issue54/EngineBasics.html
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline KDXGarage

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Original piston?
« Reply #5 on: May 31, 2013, 12:34:23 AM »
Quote from: SachsGS on May 30, 2013, 09:49:28 PM
Some "light" reading on the subject. :<img src=" title="Roll Eyes" class="smiley">      www.contactmagazine.com/Issue54/EngineBasics.html

Thank you for sharing the link.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Jeram

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Original piston?
« Reply #6 on: May 31, 2013, 04:29:59 AM »
OIL DOES NOT EQUAL RICHNESS

once rebuilt check your jetting to avoid it happening again, or get the shop to tune it for you if you dont know how :)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline JaredRM250

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Original piston?
« Reply #7 on: May 31, 2013, 10:14:56 AM »
I think all in all I should have checked the top end when I bought the bike (used) because I used it for approx 30 hours so god knows how many hours the piston has had on it! Poor thing.

Cheers,

Jared.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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Original piston?
« Reply #8 on: May 31, 2013, 10:20:07 AM »
I pull the head and exhaust as a bare minimum on any second hand bikes I buy.
Best to be safe then sorry.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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If you don't fall off you are not going hard enough

Offline Coop

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Original piston?
« Reply #9 on: May 31, 2013, 12:33:37 PM »
Quote from: TMKIWI on May 31, 2013, 05:20:07 PM
I pull the head and exhaust as a bare minimum on any second hand bikes I buy.
Best to be safe then sorry.

I always do that also (and more) once I get it home. I know some guys who say they do before they buy but nobody around here would ever agree to that first lol.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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- Mike - Don't take life so seriously, nobody gets out alive.

Offline Jeram

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Original piston?
« Reply #10 on: June 01, 2013, 02:41:01 AM »
no need to pop the head off before buying guys,

just purchase a cheap endoscope and then pop the exhaust off and insert the camera... allows you to inspect the bore, the piston dome, piston skirt and ports....

perfect :)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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Original piston?
« Reply #11 on: June 01, 2013, 05:29:50 AM »
Quote from: Jeram on June 01, 2013, 09:41:01 AM
no need to pop the head off before buying guys,

just purchase a cheap endoscope and then pop the exhaust off and insert the camera... allows you to inspect the bore, the piston dome, piston skirt and ports....

perfect :)

I do keep thinking of buying one but havn't got around to it.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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If you don't fall off you are not going hard enough

Offline Stusmoke

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Original piston?
« Reply #12 on: June 01, 2013, 06:18:34 AM »
Quote from: Coop on May 31, 2013, 07:33:37 PM
Quote from: TMKIWI on May 31, 2013, 05:20:07 PM
I pull the head and exhaust as a bare minimum on any second hand bikes I buy.
Best to be safe then sorry.

I always do that also (and more) once I get it home. I know some guys who say they do before they buy but nobody around here would ever agree to that first lol.

Agreed on both posts. Never know what someone will try and pull. When I was selling my 250 a guy asked me to split the cases so he could inspect the crank. That didn't go down too well :D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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