Ducati Sporting Club

Thread Tools Search this Thread Display Modes
Old 03-Jun-2012, 12:16 PM
Bornagain Bornagain is offline
Registered Forum User
Posts: 10
Join Date: May 2010
Tps and more.

Have been having problems with the rear cylinder running lean.
Have reset the tps to 150mv butterfly fully closed, set throttle link with vac guages to achieve good ballance through rev range. Thus far all well.
Next step connect up co meter to both exhaust ports and trim air bleeds to achieve good co balance. This is where the problems start. Co on rear 3%, front 8% Finally got co balance with rear air bleed fully closed and front open about four turns. Cylinder balance is now around 3 inches hg out.

Any coments folks?
Reply With Quote
Old 05-Jun-2012, 11:00 PM
nelly's Avatar
DSC Member nelly nelly is offline
DSC Club Member
Ducati Corse
Posts: 3,134
Join Date: Jan 2002
Mood: Bloo and Yellow.. and Red now ;)
Always go for CO balance over vacuum. Did you adjust balance bar with air bleeds fully closed?

.....but better in YELLOW, or Bloo and now even RED

www.cornerspeed.co.uk you know you want to
http://www.nolimitstrackdays.com the best trackday organisers in the UK
Reply With Quote
Old 06-Jun-2012, 02:04 PM
Bornagain Bornagain is offline
Registered Forum User
Posts: 10
Join Date: May 2010
Hi Nelly.....Yep balance was done with the air bleeds closed. Its just that I cant remember it being this far out the last time I did it. Had a good look around and couldnt find anything wrong. Checked belt alignment and tension, Compression test was in balance, Changed coils and leads over, new plugs, changed injectors over all to see if it made any difference, but didnt.
Couldnt find any leaks in induction side or any leaks in the exhausts. Just seems a bit odd to me.
As you say, co balance is the most important, so it is set now, just got to take it for a road test to see if its all ok.
Just another question. Is there an offset in the rear cylinder fuel mapping on this (st4 2001)?
Reply With Quote
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes
Postbit Selector
Switch to Vertical postbit Use Vertical Postbit

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Recent Posts - Contact Us - DSC Home - Archive - Top
Powered by vBulletin 3.5.4 - Copyright © 2000 - 2018, Jelsoft Enterprises Ltd. - © Ducati Sporting Club - All times are GMT +1. The time now is 11:46 AM.