Prefect Posted December 29, 2020 Report Share Posted December 29, 2020 I have a pair of HS6 Carbs from a 2500 TC Saloon Type FZX1263. I would like to fit them to a TR4A motor (which should have AUD 209). I have replaced the needles (flexible (Top Hat)) from BOB with BAQ (nearest available match to TW according to mintylamb). Do I need to change the jets? Any advice welcome please as I am all at sea here! Quote Link to post Share on other sites
RogerH Posted December 29, 2020 Report Share Posted December 29, 2020 Have a look on the SU website http://sucarb.co.uk/carbspec/carburettor/spares/id/2485/ http://sucarb.co.uk/carbspec/carburettor/spares/id/2391/ This will show the difference. For instance the damper spring on the 2500 is Yellow and the TR4A is Red Roger Quote Link to post Share on other sites
Prefect Posted December 29, 2020 Author Report Share Posted December 29, 2020 34 minutes ago, RogerH said: Have a look on the SU website http://sucarb.co.uk/carbspec/carburettor/spares/id/2485/ http://sucarb.co.uk/carbspec/carburettor/spares/id/2391/ This will show the difference. For instance the damper spring on the 2500 is Yellow and the TR4A is Red Roger Hi Roger I have bought red springs I was wondering on Jets? Quote Link to post Share on other sites
harlequin Posted December 29, 2020 Report Share Posted December 29, 2020 (edited) Are not all SU jets the same size for a given carb type? I believe HS6 have a 0.9mm jet It is worth phoning Burlen Fuel Systems to confirm and get new ones as they do wear George Edited December 29, 2020 by harlequin Quote Link to post Share on other sites
Prefect Posted December 29, 2020 Author Report Share Posted December 29, 2020 13 minutes ago, harlequin said: Are not all SU jets the same size for a given carb type? I believe HS6 have a 0.9mm jet It is worth phoning Burlen Fuel Systems to confirm and get new ones as they do wear George Thanks Will ask Quote Link to post Share on other sites
peter clarke Posted December 30, 2020 Report Share Posted December 30, 2020 you may have to alter the mounting angle of the float bowl to suit the 4A. Quote Link to post Share on other sites
Prefect Posted December 30, 2020 Author Report Share Posted December 30, 2020 Thanks for that tip! Quote Link to post Share on other sites
Lebro Posted December 30, 2020 Report Share Posted December 30, 2020 You can buy the parts needed to alter the angle, or you can modify what you have. Bob. Quote Link to post Share on other sites
Ian Vincent Posted December 30, 2020 Report Share Posted December 30, 2020 (edited) I have an old book called "Tuning SU Carburettors" which includes a full set of application tables and specifications. According to those tables a Triumph 2500TC was fitted with AUD 607F/R carbs which are HS4s not HS6. The jet size was 0.090". The standard needle was ABU. CORRECTION - my book is very old! the 1976 2500 TC used HS6 carbs. According to the same book, all HS6 carbs had a 0.100" dia jet. If you need any further information, drop me a PM. Rgds Ian Edited December 30, 2020 by Ian Vincent Quote Link to post Share on other sites
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