Post by: JaredRM250 on May 30, 2013, 10:57:23 AM
Post by: JaredRM250 on May 30, 2013, 11:00:23 AM
Any feedback greatly appreciated.
Cheers,
Jared
Post by: Jeram on May 30, 2013, 11:33:50 AM
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
Post by: JaredRM250 on May 30, 2013, 11:40:41 AM
Post by: SachsGS on May 30, 2013, 02:49:28 PM
www.contactmagazine.com/Issue54/EngineBasics.html
Post by: KDXGarage on May 31, 2013, 12:34:23 AM
Some "light" reading on the subject.
Thank you for sharing the link.
Post by: Jeram on May 31, 2013, 04:29:59 AM
once rebuilt check your jetting to avoid it happening again, or get the shop to tune it for you if you dont know how
Post by: JaredRM250 on May 31, 2013, 10:14:56 AM
Cheers,
Jared.
Post by: TMKIWI on May 31, 2013, 10:20:07 AM
Best to be safe then sorry.
Post by: Coop on May 31, 2013, 12:33:37 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.
Post by: Jeram on June 01, 2013, 02:41:01 AM
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
Post by: TMKIWI on June 01, 2013, 05:29:50 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.
Post by: Stusmoke on June 01, 2013, 06:18:34 AM
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
