GS850 fixup?

[Suzuki mad]

No Big Z, i'm saying that a modern bike needs a mechanical expert with fuel injection and computer plug in's to tune the ******** thing. (I know I teach kids how to work on them.)

A GS is simple compaired to that.

Work through the issue and you will have a great bike, very reliable, shaft drive, touring machine.

Oh and by the way you are in way too deep now.

Suzuki mad

[Big_Z]

learn by doing.

ha! yes, I am! but i'm enjoying every minute of it. you guys will probably be sick and tired of me by the time i'm done with this.

[Suzuki mad]

Oh did I forget to mention, comfortable ride.

All these modern bikes kill my ****. I can go for miles on the GS.

Suzuki mad

[Big_Z]

not dead yet!

Hello All,
got the bike back together tonight. cleaned/rebuilt carbs. new airboots. nothing else done yet. carbs took me a while to do and had to wait on some parts. so i wanted to put it back together and fire it up to make sure it still ran and my work so far hadn't monkeyed something up.

well, I primed the carbs and fired it on choke. it started but will not idle. if I use throttle to increase RPMS it sounds like its running rough and occasional pops out the muffler. also when I crank the throttle (in nuetral) the RPMs slowly rise to about 3.5k then spikes up quickly after that. after running a bit I felt exhaust headers and 1-3 are hot to touch but 4 is only warm. so i'm guessing one problem is something wrong with #4?

I would appreciate some trouble-shooting hints. should i work on getting it idleing first or figure out what is up with #4?

Thanks!
Aaron

[pbunyan850L]

Just real quick...did you sync carbs? Also does #4 have fire? Great tutorial on basscliffs web site about carbs check it. Good luck

[etravis2]

If you rebuild the carbs, you may have to change the idle and floats. Depending on the previous owner, he may have just adjusted the carbs, year by year. It sounds like a carb problem, but you need to be thorough. Yours should be a CV carb. Be carefull, you have a lot of rubber in them.

[BassCliff]

Hi Mr. Big_Z,

Now that you've cleaned the carbs (I'm assuming that you've replaced the intake O-rings and maybe even the intake boots), sealed your airbox, installed a new air filter, and bench sync'd the carbs, now it's time to check the valve clearances before you vacuum sync the carbs. Keep up the good work. Keep us informed.

Thank you for your indulgence,

BassCliff

[Big_Z]

Can you define a Bench-sync? is that just making sure your screws are 2.5 turns out after a dip or is it more complicated than that?

[Big_Z]

doh!

ha! i'm such a noob.

i was reading some other posts trying to gather more information and I was looking at this page about carb hoses (thanks, basscliff) (http://members.dslextreme.com/users/...locations.html)

I had my carbs hooked up all wrong. I had one of my vent tubes going to the gas on the petcock and the fuel line was going to the vacuum port on the petcock. and the vaccuum hose was still laying on the bench.

i fixed all that and it fires up and idles with choke open but not without choke. also RPM hesitation is gone and its revs up nicely. #4 is still cold to touch. i'll check for spark (whats the best way to check this?) can I put the wire from #3 on it and trying firing it up to see if its the plug wire?

[Steve]

You can swap 1&4 or 2&3, but NOT 3&4.

.

[psyguy]

[quote=Big_Z;877859]I had my carbs hooked up all wrong. I had one of my vent tubes going to the gas on the petcock and the fuel line was going to the vacuum port on the petcock. and the vaccuum hose was still laying on the bench.
[quote]

yeah, mr suzuki made a fine motorcycle when you can criss-cross the hoses like that and the bike still runs

anyhow, take all the plugs out, put them back in the caps and confirm that you have a spark on #4
while you're at it (after you've run the engine for a minute or two) check #4 sparkplug for wetness - a sign that you're getting the fuel delivered by the carb

[BassCliff]

Can you define a Bench-sync? is that just making sure your screws are 2.5 turns out after a dip or is it more complicated than that?

Hi Mr. Big_Z,

Here are some Carb Bench Sync Notes that I've collected.


Thank you for your indulgence,

BassCliff

[Big_Z]

OK, that bench sync makes sense. I didn't do taht but I was able to adjust the carbs using the main idle screw to make it idle ok.

i pulled the #4 plug and fired it up and I can see spark. so the wire is good and the plug is good. does that mean i get to take my carbs back apart?

or could it just be an adjustment of the mixture screw?

i'll go play around with it a bit and see waht i can find.

[Big_Z]

oh, one other quick question... i have a long thin tube connected to the bottom of my airbox on the left side. does that hang loose or is it supposed to be hooked to something?

[Big_Z]

OK, more info. I opened the drain screw on the #4 bowl and there was fuel in the bowl. i also tried tweaking the mixture screw on #4 to no effect.

after maybe a minute of 3k idle i checked exhaust header temps with a IR thermo and they were 105, 99, 140, 85.


looks like I might have to take the carbs back off and crack open #4 again. waht should I be looking for?

if the diaphragm isn't sealed properly could it cuase this? please advise!