Fuelling Issues?

[T250]

I have been chasing my tail trying to sort out jerky running at low revs, checked all the normal suspects, vacuum pipes, plugs, coil resistance, TPS & STPS, swapped sensors over, cleaned earth connections and added an extra earth between battery and frame, tea bag is clean, nothing came out of HP filter when back flushed, bike pulls like a train over 2K, removed TRE just in case but no difference, just filtering in traffic below 2K is a pain. Even put original stock silencers back on, which helped a little bit but still not as good as it should be.

TPS is in spec and resistance increases as throttle is opened, has anyone had one of these go faulty causing the symptoms I'm getting?

I'd of thought if there was a problem with fuel delivery it would be higher up the rev range?

Any suggestions welcome.

[Eric GSX1400K3]

Checked your vac lines and have you removed the pairs valve?.  Vac lines get brittle and leak false air.  Pairs valve needs to be blocked off properly.

How is your chain and sprockets? Can make a huge difference if they're worn or you've got frozen links. 

Check throttle cables too, throttle tube should snap back quick and have minimal play.

[T250]

Vac lines all new, pairs blocked off several years ago with blanking kit, throttle cables spot on, no obvious tight spots on chain,  get popping on over run and sometimes at tickover, checked exhaust and no leaks. Injectors were sent away and cleaned.

[Hooli]

I've had two TPS fail but test fine with a multimeter. Can you induce the fault by using exactly the right amount of throttle? Then cure it by winding more on? That's how I proved to myself it was the TPS. Even at higher speed on the over run if I wound on the right amount of throttle it'd splutter etc while slowing down.

I'll second the vacuum lines too, it's worth rechecking them.

Another thought is the MAP sensor the vacuum lines connect too. It's identical to the external air pressure sensor under the RH side panel, so you can swap them to see if the issues changes.

[T250]

Sorted! Checked everything again and again, then noticed on a couple of times after starting up there was a lag before the rev counter worked 
Went to check the battery and earth connections and noticed the earth post on the battery didn't look right, put the meter lead on and the post collapsed!
New battery and everything seems okay again, lucky it didn't happen when out and about

[grog]

Great result Mate. You never know what can happen.

[T250]

Cheers Grog