Spark plug terminal nut. Check 'em! - Page 2 - Ducati.ms - The Ultimate Ducati Forum
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post #11 of 12 (permalink) Old Jun 4th, 2019, 12:26 am
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Originally Posted by BelgianDuc900SS View Post
I was thinking the same way. The plug cap snap on the nut fairly tight and on top of that I tightened the nut with a set of pliers to the spark plug. And still it is rotating.
I'll take a guess that it may be the cap vibrating, in a slight CCW-to-CW manner as the engine runs, ultimately ~unscrewing~ the threaded nut (let's say) 1 or 2 degrees per oscillation.

Quote:
Originally Posted by BelgianDuc900SS View Post
...If the nut will come loose again I probably gonna get plug caps that snap on the thread, not on the nut.
This seems like a viable and smart solution.


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post #12 of 12 (permalink) Old Jun 6th, 2019, 2:41 am
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The other thing to check (for random misfires, esp. at low revs/idle) is the connection of the plug cap to the HT wire. It's a screw together connection, and with age, the wires inside the cable break and disappear, and the end of the cable expands a bit, so the screw doesn't contact things too well electrically.
Easy fix - unscrew the plug cap, snip off about 12mm (1/2") from the end of the cable, and screw the plug cap back into nice fresh wires.

This solved a misfire problem that I had for far too long - because I kept thinking it was the carbs. It wasn't until I got some second hand coils to change them out, and thought to check how well the plug cap was attached (not very well) that I thought to check the same thing with my plug caps.
alliswell and BelgianDuc900SS like this.

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