850GS carb balance grief

[Windmill John]

Hi,
In a nutshell, past history, just over two years ago, when I got the bike with 43k miles on it, it had uncomfortable vibration at over 60 MPH.
Took it to South London M/C who tried it and said "Put thick oil in and get shot; the big end has gone"!
Slightly unhappy and loving the bike, I continued to ride it. Any way, 21k miles later, used weekly, abroad four times plus other stuff, I know the problem is to do with carbs. alright, throttle bodies!!
I balanced the right carb to the left the other day, much smoother, better power on take up, but hunts on the overrun. so, I slacked left cable a tad, matched the right and more hunting.
So, I tightened left hand cable, balanced the right to match, now the powers down, a bit rough but no hunting.
I'm now convinced the problem is with the TPS.
Have anyone had experience of fiddling with it.
I know how to balance carbs, I've had 4 cylinders and other twins, but the GS is an absolute pig; to balance that is
I love the bike, but balancing the carbs seems only half the battle. Any advice, besides put it back in the right place, before I remove the TPS and shout at it?
Cheers
John

 

[John Armstrong]

What I'd do, given that you're near London, is to give Mr Steptoe a ring!

 

[richie]

plus one for the above

 

[Windmill John]

850GS carb grief

So it's not something to do myself?

 

[MikeP]

Having said what you have done with the throttle bodies, what have you done about the valve clearances and rocker end-float clearances?

 

[Windmill John]

Bearing in mind I've only balanced the bodies.
I did tappets not long ago.
I recently fitted a new choke cable. Nothing done with end float.

 

[Stewart H]

Worth going through the lot, clearances and end float first then another go at the balancing again, theres a good writeup on IBMWR oilhead technical, careful setup can make a big difference with these bikes, I use a homemade manometer to balance the bodies.

Stewart

 

[Pekkavee]

Have a look in here for TPS

http://advwisdom.hogranch.com/Wisdom/tps3.1.pdf

Pekka

 

[Comfy Old Boots]

So it's not something to do myself?

I;d have a go and get to steptoe. Leave it with him as long as he likes

I'm going to mototech in lisburn to get my similar sorted. Once it's set to factory settings (running well) you can do it yourself. That's what my receipts tell me.