Cam wheel markings

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jerry atric

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Jan 6, 2026, 10:52:15 AM (5 days ago) Jan 6
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Image 5.jpegFurther to my loss of power question, I've been looking for an unused cam for my GTS. The part number is 8515 is stamped on all the ones ive  seen previously but I've been offered on simply marked with 'S'. Any thoughts on this please? Thanks.

Paul Marx

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Jan 6, 2026, 10:56:59 AM (5 days ago) Jan 6
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S = scarico = exhaust.

Le mar. 6 janv. 2026 à 16:52, jerry atric <baconsl...@gmail.com> a écrit :
Image 5.jpegFurther to my loss of power question, I've been looking for an unused cam for my GTS. The part number is 8515 is stamped on all the ones ive  seen previously but I've been offered on simply marked with 'S'. Any thoughts on this please? Thanks.

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Rick Yamane

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Jan 6, 2026, 11:25:47 AM (5 days ago) Jan 6
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Raises the question: why would they need to mark a cam exhaust unless part of a dual cam design?

 

From: guzzi-...@googlegroups.com <guzzi-...@googlegroups.com> On Behalf Of Paul Marx
Sent: Tuesday, January 6, 2026 7:57 AM
To: guzzi-...@googlegroups.com
Subject: Re: [guzzi-singles] Cam wheel markings

 

S = scarico = exhaust.

 

Le mar. 6 janv. 2026 à 16:52, jerry atric <baconsl...@gmail.com> a écrit :

Further to my loss of power question, I've been looking for an unused cam for my GTS. The part number is 8515 is stamped on all the ones ive  seen previously but I've been offered on simply marked with 'S'. Any thoughts on this please? Thanks.

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jerry atric

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Jan 6, 2026, 11:32:22 AM (5 days ago) Jan 6
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Yes, agree on S = scarico, valves are so marked, but on the pre-war singles both cams are on the same wheel. The profiles certainly LOOK correct.
Sorry about the huge picture!

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