Hi,
Why are these two A65 breather discs different?
Dave.
For different cams/valve timing?
Hi Dean,
Perhaps but the breather works more in relation with the movement of the piston. I had look on line and I reckon that they were all the same for A50/A65. I did find a reference to some pattern one bing made wrong so maybe I have one of those.
Now do I destroy it to prevent inadvertent fitting or keep it a curio?
Dave.
Hi,
Thinking a bit more about this there could be more to Dean's suggestion.
I have heard that as part of tuning the cam can be advanced a few teeth so advancing all of the valve timing. As the breather is driven by the cam this would also advance the timing of the breather but I reckon as this is to with the descending pistons it is now out of synch.
So a disc with retarded pegs or cut outs would be needed.
I either have a badly made part or a rare specialist tuning part.
Dave.
Hi Dave, don't know if you got to the bottom of this.
I went to look in my garage as I should have a few lying around, but alas I couldn't find any. Anyway scanned through SRMs website and found the ones they list are as I remember them, with the tabs in the same position as the windows.
Anything also will invite oil leaks, unless your cam is also a tooth out of phase
https://shop.srmclassicbikes.com/product/rotary-breather-disc-a50-a65-t110-t120-702254
Hi Allan,
No real answer yet so just there as a curiosity.
Dave.