Thunderbird 900

Can I get some advice please. I ride a Triumph Thunderbird 900, 1st registered 2001. 35,000 miles and regularly serviced.
Lately, on the open road, the bike runs sweet as a nut, but at slow speed, in say 2nd / 3rd gear, the machine coughs, splitters and can die on me. It will restart no problem, but needs high revs to gain sufficient power to move off. If I start it from cold, it will tick over no problem.
I have established that there is no water or muck in the tank, and it has fresh fuel.
Any help or advice would be appreciated.

 

Hi there Chiar1. Used two tanks with Silkolene Pro boost, which I thought would do the same job as Red ex. If you think Red ex will possibly help I'll try. Planning to remove and check fuel filters, but if that were the problem I'd have thought Tick over would be problematic.

 

Hi Erling. Yes, choke to start ,and it starts first time. Once engine warm, close off choke, and she ticks over fine for ages. Crack open the throttle, and she spits, farts and coughs until higher revs reached, then runs fine. Open roads from Spean Bridge to Eileen Donan on Sky road.....ran like a dream. Pulled into car park and engine died. Started first touch of the starter. coughed into main road, smooth as you like on open road.

 

Many thanks Erling. Studying Haynes manual as I write. I'll see about replacing the idle jets, and while I'm at it, is there anything else I should do when the carbs are laid bare.

 

Hi Bikerman. yes, Air box replaced about 18 months ago. Very little mileage since then due to Covid and health problem last year.
Thanks.... all advice / help appreciated.

 

Many thanks to one and all. Got to say advice amazing. Unfortunately, it means a right load of work. Ah well, bike off road for winter; a winter project looms. Thunderbird and road salt don't mix very well. Cheers guys.

 

Hi Bikerman. Advice please. At your suggestion I have ordered new , " idle jets " from Triumph , but the Parts Department identified them s as, " needle valves ", which are now bought, paid for, and winging their way to me. But, are idle jets and needle valves one and the same thing. Triumph implied that they, ( Triumph ), simple name them differently. Seems strange and I worry I'm getting the wrong part.

 

Hi Bikerman. Thought you may be interested in this . It appears that " Triumph ". Don't stock / supply the Pilot jets for the KEIHIN carbs on my Thunderbird 900. Everything else is stocked, but not these. Obviously I'll use Mr Google to try and locate, but may be of interest to any members who enquire with the same problem.

 

Thanks for this. I'll contact them Monday.

 

Ok guys.... Not out of the woods yet.
As recommended , the Carbs have been removed and the float chambers found to be full of crud. Chambers cleaned out, all jets cleaned, tank cleaned out , and while tank was off plugs one and three removed cleaned and replaced. Everything put back together including new rubber seals all round, but problem at low revs remains. No.2 plug impossible to get at. If that plug was seriously fouled up or u/s, could that cause my stall / stuttering problem. Advice appreciated.

 

Many thanks. Seems I'll have to source one. What a pain !!!