p6x Posted April 14 Share Posted April 14 I noticed the color between my cylinder head and cylinder changing from aluminum to oily brown; It is oil wet, so I need to change the gasket on both sides. There were no traces when I purchased the bike, and it only started to appear. Is this one of the common problem? 20 years old gasket, it almost seems normal. Are there any specific good quality gasket you'd recommend? Link to comment Share on other sites More sharing options...
gstallons Posted April 14 Share Posted April 14 There are o-rings between the rocker arm assy. and the cylinder head that are hard , brittle and no longer doing what they are supposed to do . Look at a parts catalog and you will find them . Replace them and perform a valve adjustment while you are into it. 3 1 Link to comment Share on other sites More sharing options...
docc Posted April 14 Share Posted April 14 As gstallons said, #16 in the diagram, O RING (#90706203): Link to comment Share on other sites More sharing options...
gstallons Posted April 14 Share Posted April 14 Order plenty , they are not expensive. Is it #16 or #21 ? Whatever it is , they are difficult to dig out .My vision is blurry right now Thank you Docc for the technical support . 2 1 Link to comment Share on other sites More sharing options...
docc Posted April 14 Share Posted April 14 1 hour ago, gstallons said: Order plenty , they are not expensive. Is it #16 or #21 ? Whatever it is , they are difficult to dig out .My vision is blurry right now Thank you Docc for the technical support . Ah, yes: #16 x 2 (one per head?) and #21 [O RING-VITON (#90706094)] x8 (four per head?) . . . The #16 is the likely culprit. 1 1 Link to comment Share on other sites More sharing options...
p6x Posted April 15 Author Share Posted April 15 1 hour ago, gstallons said: Order plenty , they are not expensive. Is it #16 or #21 ? Whatever it is , they are difficult to dig out .My vision is blurry right now Thank you Docc for the technical support . I have an o'ring pick. This is a survivor of my oilfield days, and a gift from a dentist. You can also use a scribe to dislodge them. Here's the spare part nomenclature. Unfortunately, the description seems to be incorrect for both item #16 and #21. I should order them from MGcycle, measure them, and purchase them directly from Parker... https://www.allorings.com/Metric-O-Ring-Size-Chart https://www.mgcycle.com/index.php?main_page=product_info&products_id=4830 https://www.mgcycle.com/index.php?main_page=product_info&products_id=1382 Link to comment Share on other sites More sharing options...
gstallons Posted April 15 Share Posted April 15 Whew , it was a long time ago . Joe Eish stopped me from buying a head gasket for my SE and sold me o-rings instead . 25 or so years ago. 3 Link to comment Share on other sites More sharing options...
p6x Posted April 15 Author Share Posted April 15 2 minutes ago, gstallons said: Whew , it was a long time ago . Joe Eish stopped me from buying a head gasket for my SE and sold me o-rings instead . 25 or so years ago. You just did the same for me.... 2 Link to comment Share on other sites More sharing options...
gstallons Posted April 15 Share Posted April 15 you're welcome Link to comment Share on other sites More sharing options...
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