Spark plug terminal nut. Check 'em! - Page 2 - - The Ultimate Ducati Forum
LinkBack Thread Tools Display Modes
post #11 of 12 (permalink) Old Jun 4th, 2019, 12:26 am
Senior Member
Join Date: May 2019
Location: Yuma, Az., USA
Posts: 504
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.

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.

Never Quit, Die Falling Forward
1996 900 CR. ... LOW ZOOT
Rex Coil 7 is online now  
Sponsored Links
post #12 of 12 (permalink) Old Jun 6th, 2019, 2:41 am
Senior Member
steveb64's Avatar
Join Date: Aug 2012
Location: Whangarei, , New Zealand
Posts: 2,446
Images: 2
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.

'95 900 Superlight IV #064

Mods are: K&N filter, airbox lid on with rubber trumpets removed, MBP collets, full SMI (SilMoto Italia) spaghetti exhaust with 'open' carbon cans, 41mm FCR's - #182 mains!, Barnett alloy clutch basket, Oberon slave cylinder, Ohlins fork springs, Ohlins rear shock, Verlicchi swingarm.
steveb64 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the - The Ultimate Ducati Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Snapped spark plug MTS1200 (2014) dhickie Multistrada 17 Feb 21st, 2019 10:43 am
Spark Plug Socket for the DS 1000 engine vertical cylinder motoFiend Tech Forum 7 Dec 6th, 2018 9:17 am
Multi 1200S 2013 - how to remove spark plug Stavrich Multistrada 19 Dec 1st, 2018 5:54 pm
Spark plug problem RobCas47 Tech Forum 3 Apr 22nd, 2016 9:07 pm

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome