Triumphrat

Spartan Andy

Hi TTBONNE, Sorry for the late reply, (DIY at Home),
I did not go for the booster plug device; I have left the bike totally stock as it runs ok,

Good try in your diagnosis work so far,
My thoughts are if the bike runs ok without the oxygen sensor, Then it must be running very lean below 10% throttle opening when the oxygen sensor working, Why?
Easy fix would be to use a blanking plug kit, but this for me is not the correct way,

The Stock Tiger fuel map is very lean from the factory and this does cause a low speed jerky drive, which is normal,
This also the same on my previous bike - BMW Dakar,

I have read that a few tiger owners have tried the booster plug to help with this jerky low speed issue, some reported positive results and some with no difference,

I always start with searching for problems with the simple things first before starting throwing money on guess work,

Check sparks plugs, I hardly let mine go pass 4k,
You need a good spark for a lean fuel mixture,

Throttle body balance, this can make a big difference, especially at engine idle,

Also I would speak to Triumph independent specialists for advice, If anyone could recommend one for you, Then great,

Good Luck

TTBONNE

Hi Andy,
New plugs and coils made no difference. Neither did the 2 throttle body balancings.
Awaiting O2 bypass. Will give it a try.
At this point, I think that the glitch is in the programming of the ECU. Mine is worse the warmer it gets. Since owning the bike in April or so, I ride in the afternoon. Here in the afternoon, from April thru October, the temp is always over 90 degrees. From talking to my buddy, a native Brit, the temp there rarely gets over 80. So, I don't know how much testing Triumph did with the ECU at temps over 90.
That's based on what I have observed, don't know if it's correct or not.