T100 A Bit Rough At Low Speeds With Throttle Open Steady

Fuel filter? Throttle bodies? Valve clearances? reg/rec? Earth/battery connections Coil? Leads failing? Poor/dry/corroded electrical connection? If you don't service a bike fully you end up with problems that are harder to find or eliminate.

 

As it's fuel injection , and low running speeds. I'd consider battery or regulator ! Electronic controlled engine's can respond badly and react/run in exactly the way you described if electrical system isn't in tip top condition !
And as @PatW says , valves or fuel filter , throttle position sensor or dirty dry electrical connectors plus low voltage !

 

Check battery with engine running and switched off , ~12•6v ~ ish and ~14+ v at moderate rpm's

 

My reply was a bit of a scatter gun/lecture and probably seemed unhelpful. I would advise you to get a Haynes or workshop manual and do a few basic checks and to save yourself some money, depending on how many tools you have and how confident you are. If you eliminate things like making sure you have a good battery and connections, change the fuel filter which a garage will charge you ££ for, there are instructional videos and tips on here in the air cooled twins section, don't get into anything that you're not confident with so you don't cost yourself more money to put right.
Good luck.

 

Start with the easy stuff and try one thing at a time so you know what caused it.
I'm sure the solutions above will sort things for you.

 

I'm in a completely different part of the country but I have had some dealings with Team Roberts a triumph dealer up north, in post Code DN12 4DY, they were helpful for parts. If you look on the forum here, there are perfectly good alternative fuel filters at much lower prices than genuine triumph. Note: the fuel filter on your bike is inside the fuel tank.

 

Howay!

 

It won't hurt to run injector cleaner thru a couple of tanks, I use it all the time. Do you run E10 or E5 fuel and how old is that fuel, could be water, rust? or general crap in filter or pipes. Weak spark due to dirty or knackered ht leads/caps. Try spraying wd40 over them and see if any improvement
If it starts OK I would rule out valves but when were they last checked?
As someone else said servicing is important as is checking regularly, oil changes alone although good is not enough.

 

DGBland.
I would never put e10 in my bike unless there was nothing else. To much ethanol. Irrespective of what people say or manuals. To many rubber and plastic bits between tank and plugs and e10 will eat any of them.
Joe

 

Hi DG, Local person I get to do servicing he is local at Sunderland,https://www.muddysump.com/ he is a trained Triumph mechanic.
Geoff