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MODERATOR NOTE:

This sticky is posted to provide an easy means to scan for frequently required "how to" information. Links to threads containing info on modifications, tuning, maintenance and so on can be posted here.

Posts will be continually consolidated to keep the thread easy to scan, so do not be offended if your actual post is deleted, the link will have been copied to another post in the thread.

Also, no comments please. These will be removed. Thanks and best wishes!

To start, a collection of info gathered by Keef:

http://www.triumphrat.net/blogs/twins-documentation-library-7/twin-mod-links-35/

Twins documentation library general link:

http://www.triumphrat.net/blogs/twins-documentation-library-7/

Triumph Owners Manuals:

http://www.triumphmotorcycles.com/offers-and-services/manuals
 

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Discussion Starter #6 (Edited by Moderator)
Jetting

This is cut and pasted from one of Ventura's posts.
During all of the testing and modding, my Scrambler was fitted with Zard 2:1 exhaust, but the initial results were the same as with NH after-market silencers.
It seems probable therefore that any opened-up exhaust system will give comparable results.
It was also without the AI system.
It was concluded during testing that the type of filter (stock paper or Uni) made no difference to A/F ratio, so this isn't included.
All the below adjustments were made to maintain an A/F ratio of between 13:1 and 13.7:1
This being the considered optimum.

Stock exhaust with snorkel................110 / 40 / no shims / 1.5 turns
Open exhaust + no snorkel................115 / 40 / no shims / 2.0 turns
Above + Restrictor gone....................120 / 40 / 1 shim / 1.0 turns
Above + enlarged filter inlet...............130 / 40 / no shims / 1.75 turns
Above + RHS opened up....................135 / 40 / no shims / 2.0 turns
Above + velocity stacks.....................145 / 40 / no shims / 2.5 turns
With ARK + good pod filters............. >145 / 40 / no shims / 2.5 turns

I hope all of this will be of help as a guide to others who are endeavoring to determine correct jetting following basic modding of the air intake.
Hopefully, as others carry out the A/F gauge install, these figures can in the future be added to / amended / or maybe even totally contradicted!!
More lively discussion to look forward to!!

For reference, Keihin vs Dynojet equivalence. Jets in above table are Keihins:

Keihin ----- DJ
110 ------- 106
112.5 ----- 108
115 ------ 110
117.5 ----- 112
120 ------- 114
122.5 ------116
125 ------- 118
127.5 ------120
130 ------- 122
132.5 ------124
135 ------- 126
137.5 ----- 128
140 ------- 130
142.5 ----- 132
145 ------- 134
 

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