Working on an EVO Road King. Classic base gasket issue.
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I have done several of these and they are all holding over the last ten years or so. You can see in the picture the James metal base gasket that is rubber covered. The EVO motor was designed (with) Porsche and was to be assembled with asbestos base gaskets but that material became outlawed. They were assembled at the factory with a paper gasket that split over time.
Along with a James base gasket, I use a Trock lapping plate to hone the bottom of the cylinder flat with grinding compound and use late 90's cylinder studs with new cylinder nuts to hold the torque. I also use a MLS (Multi Layer Steel) head gasket and progressively torque to 42 LBS. Pretty much a permanent fix for leaky base gaskets.
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Hey DEEBS, I have a quick question, When using new rings, would you check the ring gap clearances before or after using the hone on the cylinder wall?2H7 (79) owned since '89
3H3 owned since '06
"If it ain't broke, modify it"
☮
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Just finished valves on the XS... went well... still have some kind of burbling or stuttering at constant throttle in cruise... not sure what the deal is there. Synced the carbs again last night, tried to adjust the mixture again by ear... can't quite solve the stutter... doesn't impact performance it seems, just annoying to the ear. Right now I also have my 1995 Triumph Sprint 900 apart on the lift, waiting on shims... doing valves on it too (double valve job back to back)... a little bit trickier and more cramped on account of the fairing... and having to remove the cams... waiting on shims now.
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Originally posted by bikerphil View PostHey DEEBS, I have a quick question, When using new rings, would you check the ring gap clearances before or after using the hone on the cylinder wall?
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Originally posted by Ccitis View PostJust finished valves on the XS... went well... still have some kind of burbling or stuttering at constant throttle in cruise... not sure what the deal is there. Synced the carbs again last night, tried to adjust the mixture again by ear... can't quite solve the stutter... doesn't impact performance it seems, just annoying to the ear. Right now I also have my 1995 Triumph Sprint 900 apart on the lift, waiting on shims... doing valves on it too (double valve job back to back)... a little bit trickier and more cramped on account of the fairing... and having to remove the cams... waiting on shims now.Last edited by DEEBS11; 04-11-2024, 02:39 AM.
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Originally posted by DEEBS11 View Post
Phil, I first measure the old ring gap in the bore and make note. Then I hone it and wash the bore in hot soapy water. Dry it and lightly oil it with 20W50. Then I measure both top rings pushed in about 3 inches into the bore looking for about 0.014. The calculation is .004 or .005 x the bore. The rings are Hayden moly coated. A small touch of oil to the skirts of the pistons, and re-install the cylinder (with a ring compressor) carefully without damaging the new base gasket. This has produced good results every time.2H7 (79) owned since '89
3H3 owned since '06
"If it ain't broke, modify it"
☮
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Use aluminum oxide for aluminum like master cylinder bores. Just a light clean up like the cylinder bore. I usually only push the hone in and out quickly to get that 45° crosshatch about 5 or 6 times. Then clean the bore with hot soapy water (really) and dry. If you don't do this step there will be cut metal and abrasive stuck in your crosshatch. I'm sure thousands of motors are crap because this step is overlooked. The final step is lightly re-oil the walls and have everything ready to go back on the pistons.
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I have never done a Nikisil bore because I have never seen one wear out (with proper care). My 98 Guzzi has 220,000 miles on it and still does not burn one drop of oil with Nikisil cylinders. But if it ever needs rings I would use the aluminum oxide hone as shown in the chart.
The XS1100 motor uses Silicon Carbide 240 grit. The bore is 2.815 inches. A 3 inch hone should work. I use cutting oil on the bore.
Last edited by DEEBS11; 04-11-2024, 08:45 AM.
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The XS1100 motor uses Silicon Carbide 240 grit. The bore is 2.185 inches. A two inch hone should work. I use cutting oil on the bore
Thank you for explaining the proper technique.Last edited by bikerphil; 04-11-2024, 08:32 AM.2H7 (79) owned since '89
3H3 owned since '06
"If it ain't broke, modify it"
☮
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