Carb synch, How mutch less

[earlfor]

I set up my 1150 both ways, even on all four, or the center two carbs a cm or so lower. Had it about 6 years and 55K miles, did a lot of synchs set both ways. Never could tell any difference in performance, smoothness or the way it ran. I concluded it did not make enough difference to be significant.
I set them all even, now.

Earl

[Nessism]

I set mine about 1 cm lower on the center two with a stock cross-over exhaust installed (using mercury sync tool). I'm not exactly sure why Suzuki spec'ed it that way but can't think of a good reason to deviate either.

[don]

As always, thank you guys for shareing your experience,

I've gotten great responses, and have made up my mind........just gonna' set em' all even, and if there's a little "bump" in the idle, spend about 1/2 second dropping the center 2 to see if it smooths out. If not, then all even they'll be.


Steve,

My thought on why a cross over is only installed on the center 2 of my 82-1100 is because it's pretty close to the welded " y " junction of the outer pipe and the slip on center pipe. I'm guessing the " y " junction, (Suzuki felt), was in close enough proximity to the " cross over " pipe to act like the rest of the " cross over system", if I've made any sence at all.

[twr1776]

Here are a couple links to the Carbtune instructions. I have synced with the all even method and middle two lower per the instructions. There does seem to be a slight difference IMHO favoring the two lower method with the crossover pipe but if you get them within the two red lines per the instructions it is still pretty smooth. I have tended over time to fine tune the synch at higher rpms since the motor is in those ranges more and less at idle.

http://www.carbtune.co.uk/carboprn.html

Scroll down to see the GS specific instructions with levels (2.5 to 3.0 cm)

http://www.carbtune.co.uk/yourbike.htm

Our very own Brian Wringer is famous , Carbtune is linking to his tips for tuning GS bikes on his website. I wonder if he is getting residuals?

http://www.bwringer.com/gs/carbsync.html

[earlfor]

Here are a couple links to the Carbtune instructions. I have synced with the all even method and middle two lower per the instructions. There does seem to be a slight difference IMHO favoring the two lower method with the crossover pipe but if you get them within the two red lines per the instructions it is still pretty smooth. I have tended over time to fine tune the synch at higher rpms since the motor is in those ranges more and less at idle.

I normally do an idle range synch and once that is OK, I throttle up to whatever rpm I cruise at the most. At my cruise rpm. I tweek the synch to be spot on there. That way, the engine is smoothest in the range I spend the majority of my time in. A slightly rough idle doesn't bother me since I spend little time at idle.

Earl

[Griffin]

I normally do an idle range synch and once that is OK, I throttle up to whatever rpm I cruise at the most. At my cruise rpm. I tweek the synch to be spot on there. That way, the engine is smoothest in the range I spend the majority of my time in. A slightly rough idle doesn't bother me since I spend little time at idle.

Earl

Bingo! I synch the carbs on my 1000G at 4,000 rpm (60 mph in fifth gear), because I'm generally between 3500 and 4500 rpm when riding about town or tooling along on a two-laner (unless I'm thrashing it).

I also set them all equal across the board on the mercury sticks, FWIW.

[don]

All of you ar kind of in my brain........like the way tou fellers think.