TB Balancing

[AndyJW]

Can someone tell me how accurate the TB balancing should be on an 1150. I checked mine yesterday on a set of mercury gauges and there is a difference of about 3mm of mercury if I hold the revs at about 3000rpm. Accelerating from tickover up to 3000 the mercury levels look almost spot on. Is the difference at 3000rpm good enough or should I try to get it better? I have noticed a very minor bit of vibration at 3000 on the road, but compared to my XT600 it's nothing.

Knowing how fiddly and sensitive the settings are and how much it can be thrown out just by tightening the locknuts, I'm tempted to just leave it alone for now. What do people think?

 

[stuart kerr]

throttle body balance

hello, i was in a similar position when i did mine last week.

I use a simple gadget which is two cicular plastic tubes with tiny ball bearings in. the top ball bearing uses gravity to rest and lower one measurers the air vaccume, you adjust the throttle bodies so the ball bearings line up vertically.

Anyway i had the ball bearing probably 1-1.5 millimetres out @2500-3000rpm.

I left mine as is becuase the bike sounded fine and ran lovely. As long as its only a bit ..i'd leave it, thats my opinion.

 

[AndyJW]

Thanks for the reply.
I am tempted to leave it alone, but am going on a trip into Europe next week and am not sure if the bike will start to run rough if the balancing gets any worse during the trip. It's just that I'm not sure how good the balancing can be got and how close it is when it is considered to be "good enough" - is there a tolerance spec on the balancing that anyone knows of?