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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #1  
Old 09-13-2006, 12:00 PM
Marcão Marcão is offline
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Default Cylinder head o-rings crossover ???

Guys,

I've to check (and probably change) the cylinder head o-rings of my bike ('05 EC250). Unfortunatelly my local Gas Gas dealer doesn't have the o-rings in stock.
Have you an idea about possible crossover head o-rings for the EC's ?

Thanks in advance,

Marcão


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Old 09-13-2006, 12:48 PM
FFRDave FFRDave is offline
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You can order them from GoFasters.
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Old 09-13-2006, 05:27 PM
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Unless they are damaged by being pinched they will last several changes no drama. My race bike I have never changed one I don't think, & that has its head off more often than King Henry's wives.

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Old 09-13-2006, 06:07 PM
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Whenever I take mine off the o-rings have a definate deformation. May be fine but I prefer not to chance it. Our 125 had a bad o-ring either from re-use or poor assembly.

If you can't get them from a GG dealer in Brazil, look in the parts list, they should list the actual size of the o-rings. If you have an o-ring supplier in Brazil just order them direct. If you do this, the inner o-ring material is Viton, the outer seems like Buna N. High temp silicone will also be OK.
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Old 09-13-2006, 06:27 PM
Marcão Marcão is offline
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Thank you guys ! I got the o-rings from my local dealer (they had then in a gasket set)

Glenn,
In fact I´m afraid I have a bad inner o-ring. My bike never runs hot, but this weekend it started overboilling in the middle of a hill. When I drained the coolant it was dark brown color, but I´m not sure it was spooge mixed.
Tonight I´ll clean the circuit and replace the coolant completly. If the bike keeps going hot, then I´ll check the inner o-ring.

Nice riding,

Marcão
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'05 GAS GAS EC 250
'15 KTM EXC 350 F
'16 BMW R 1200 GS
'83 Honda CB 400

Last edited by Marcão; 09-13-2006 at 07:00 PM.
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Old 09-13-2006, 08:33 PM
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Its pretty easy to tell if there is combustion products in the coolant. You will usually see oily deposits floating on top when the cap is removed.

If you do have a problem, be sure to check the head for warpage. The o-ring should not go bad for no reason. Usuallly its from being pinched on assembly or from a warped surface.
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