The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
It is currently Fri Jul 19, 2024 10:23 pm

All times are UTC+01:00




Post new topic  Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Thu Jul 04, 2024 2:28 pm 
Offline
TDC Member
User avatar

Joined: Wed Nov 25, 2015 5:23 pm
Posts: 268
Location: Aberdeen
Hi

My 1500TC runs really well on the road but it seems very rich, is that as it should be or should adjust the mixture (Guess via the jet adjusting screw under the carbs)?

Regards

Barry

_________________
Aberdeen

1975 Triumph 1500 TC various shades of blue


Top
   
PostPosted: Fri Jul 05, 2024 7:23 am 
Offline
TDC Member

Joined: Fri Jan 08, 2016 9:00 pm
Posts: 1018
Image

The above image is available on many sites, I personally think the lighter "good" colours are for moderns only, they run hotter and leaner.

This is a sticky on the main forum page:https://forum.triumphdolomite.co.uk/vie ... hp?t=33830


Top
   
PostPosted: Fri Jul 05, 2024 4:57 pm 
Offline
TDC Member

Joined: Sun Oct 26, 2008 7:26 am
Posts: 2497
Have a read of this post
https://forum.triumphdolomite.co.uk/vie ... hp?t=33830

I expect it is mentioned, but worn spindles can cause rich running (as tuned at idle to compensate for wear, but too rich at higher rpm) and you have checked it has teh correct needles? No idea which carbs are fitted, but are the jets worn? (common with early fixed needles) and are the flaot levels are correct.
Balancing and setting the linkage can be issues too.

_________________
Clive Senior
Brighton


Top
   
PostPosted: Fri Jul 05, 2024 6:43 pm 
Offline
TDC Member

Joined: Tue Oct 15, 2019 9:00 pm
Posts: 292
A 1975 1500 TC should be running HS4 carbs ( AUD665 F & R) and ABT needles unless it is a '76 model in which case it might have slightly later carbs, still HS4's but FZX 1258 F & R. still fitted with ABT needles. Later - 1977 on - had ADN needles which are similar profile but slightly leaner.

With modern fuel it is hard to judge mixture based on spark plug "colour". Normal way is just to set the mixture at idle using "piston lift" method or use a CO monitor on the exhaust.

My main concern would be running too lean at high load/revs when damage could be done to pistons.

_________________
1975 Sprint Man O/D in Honeysuckle Yellow
1971 Stag Auto White

Too many cars, too little time!


Top
   
PostPosted: Fri Jul 05, 2024 11:01 pm 
Offline
Future Club member hopefully!
Future Club member hopefully!

Joined: Sun Nov 16, 2014 12:46 am
Posts: 431
Location: Midhurst, West Sussex.
The 1500 TC had HS2 carbs, the HS4s were fitted to the 1500 Dolomites.


Top
   
PostPosted: Sat Jul 06, 2024 8:50 am 
Offline
TDC Member

Joined: Tue Oct 15, 2019 9:00 pm
Posts: 292
According to the SU data book it was HS2's up to 1973 then 1974 onwards it was HS4's


Image

_________________
1975 Sprint Man O/D in Honeysuckle Yellow
1971 Stag Auto White

Too many cars, too little time!


Top
   
PostPosted: Sat Jul 06, 2024 9:20 am 
Offline
Future Club member hopefully!
Future Club member hopefully!

Joined: Sun Nov 16, 2014 12:46 am
Posts: 431
Location: Midhurst, West Sussex.
Quote:
According to the SU data book it was HS2's up to 1973 then 1974 onwards it was HS4's


Image
Ah! Well, I didn't know that they changed them for the last couple of years of production. I've only ever seen them with HS2s.


Top
   
PostPosted: Wed Jul 17, 2024 11:28 am 
Offline
TDC Member
User avatar

Joined: Wed Nov 25, 2015 5:23 pm
Posts: 268
Location: Aberdeen
Hi

Thanks all, the spindles dont seem to passing, spray some brake cleaner / gas around them an no change to the idle. Will change the plugs and adjust the jets a little and see if that helps without effecting the running.

Regards

Barry

_________________
Aberdeen

1975 Triumph 1500 TC various shades of blue


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 8 posts ] 

All times are UTC+01:00


Who is online

Users browsing this forum: AhrefsBot [Bot], DotBot [Bot], Google and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited