RPM idling problem

Yes those intake runners are buggers at leakig when you get the bike running squirt round them one at a time use some WD 40 if bike picks up rpm then IRS pulling air in think they are about £8 plus post from world of triumph

 

It will be. I see youre in the USA, maybe bike bandit can help with the parts if world of triumph are too expensive with delivery charges

 

That is good advice mixifix.

 

I am not sure what is missing from your bike as I do not have this information and now carbs are off you cannot check air leaks from engine did you do wd40 test ??.

 

Hi Michal, is your bike originally a California model? If it is it will have had extra plumbing for the carbon filter canister etc which might account for some of the unplugged gubbins?

 

Another thing to look for, there should be a long drain pipe which hangs down below the front of seat and exits by the drive chain in front of rear tyre, it should be closed off with a bung, not open. On my Sprint it made a massive difference to both slow running and starting.

https://www.dropbox.com/s/ia2hex5rw70pip4/Triumph T300 Service Manual.pdf?dl=0

is this the manual you have already?? .

 

The expansion tank on cooling system should have a open overflow the other hose Might be a engine breather hose and on uk bikes goes to air filter air box but your market may recirculate crankcase air back to to carbs for engine to burn and switched by solenoids that are energized by a electronic module at certain intervals.(sorry cannot see this hose mentioned in your picture)

 

That looks like tank breather pipe comes from under tank down between them to floor

 

Think if you look on world of triumph you can zoom in on the parts to work out how things go

 

think mixifix meant these shematics.just search for your bike and bingo,

http:www.worldoftriumph.com/triumph-motorcycle-parts.html