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Mystery mods? http://ducatittandf1.com/viewtopic.php?f=10&t=12254 |
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Author: | 618F1 [ Sat Nov 18, 2023 10:07 pm ] |
Post subject: | Re: Mystery mods? |
If you pulled off one of the cam end caps and took a photo of the letters and numbers on that cam and posted it then someone here can ID it. Then you will know if stock or not. No idea why a 4mm thick washer is needed with stock plugs and pistons. There might be a higher compression piston there without a divot for the plug electrode, or maybe the counterbore for the plug is just cut too deep. MikeV |
Author: | Bull Tahr [ Sun Nov 19, 2023 4:26 pm ] |
Post subject: | Re: Mystery mods? |
618F1 wrote: If you pulled off one of the cam end caps and took a photo of the letters and numbers on that cam and posted it then someone here can ID it. Then you will know if stock or not. No idea why a 4mm thick washer is needed with stock plugs and pistons. There might be a higher compression piston there without a divot for the plug electrode, or maybe the counterbore for the plug is just cut too deep. MikeV Thanks Mike, I'll pull and see. As far as the plugs go, I'll try and measure from start of plug holes to top of pistons at TDC and see if there is any difference. |
Author: | danomar [ Sun Nov 19, 2023 8:34 pm ] |
Post subject: | Re: Mystery mods? |
Bull Tahr wrote: The Vertical cylinder spark plug had a 4mm shim washer on it , none on the Horizontal. Plugs are correct ones. Why? That might for plug indexing—aiming the electrode for better ignition. I have used 1mm or 2mm washers for indexing in the past, but 4mm thick? Possibly the PO accidentally left it on and forgot..? |
Author: | Bull Tahr [ Tue Nov 21, 2023 7:28 pm ] |
Post subject: | Re: Mystery mods? |
UPDATE: She does indeed have different cams in there, 900SS cams according to the previous owner. The shim on the rear cylinder will stay there for now until I can get the heads off and see what's been going on there. Si t will me a very tender process on cranking by hand once I do the belts and checking as I go that everything turns smoothly as she should.... |
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