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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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#1
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Cylinder head o-ring question
Ok,, so I'm finally getting around to messing with the blown o-ring gaskets on my 97 gg 250. Tonight I rolled the bike into the center of the garage and started in,, 25 minutes down and I have the cylinder head in my hand. Yes the inner o-ring was crunchy and traces of blowby in two passages. I guess that's the smoking gun. I go thru the sleeves of gasket kits from engine kits I have done or helped others do. I also got a couple given to me from guys leaving the gg fold back in the early days. Out of everything I have a set of newer 250 o-rings and I think a set for this. The outer o-ring is not black but a brownish. Is this a cyl head o-ring? Or for something else? Size is perfect.
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Steve 16 Beta 350rr 04 KTM 525 sx/exc gone 03 KTM 625 sxc-rehab unit-did its job and now gone 03 GG 250 ec-gone 97 GG 250 ec Gone |
#2
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Steve,
Brown is good, likely EPDM, better than BunaN rubber. I've had inner head orings like this but never an outer. |
#3
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Ok,, great I feel better about putting this back together. Thinking about taking the head up to Mike up in Dupont to have it surfaced. since I did have an issue.
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Steve 16 Beta 350rr 04 KTM 525 sx/exc gone 03 KTM 625 sxc-rehab unit-did its job and now gone 03 GG 250 ec-gone 97 GG 250 ec Gone |
#4
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Check the cyl too, especially the o-ring grooves. Easy to clean up the surface on a glass plate with some #400. Probably even do it on the bike with a small plate and stuffing the bore and water jackets.
Usually when that rubber is hardened and takes a set, its a sign of high temps. Could the bike have overheated for another reason and caused this? |
#5
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I swapped out carbs and stayed with the jetting from the old carb. May need to rethink that,, it's the same sized carb but a newer one. Also an airstryker. I did not think of rejecting for that factor at the time. Sounded good and ran 100% so I figured carb was good.
__________________
Steve 16 Beta 350rr 04 KTM 525 sx/exc gone 03 KTM 625 sxc-rehab unit-did its job and now gone 03 GG 250 ec-gone 97 GG 250 ec Gone |
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