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GS850 fixup?

  • Thread starter Thread starter Big_Z
  • Start date Start date
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.
 
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
 
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?
 
doh!

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/storagecliff/images/hose_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?
 
Big_Z said:
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.
yeah, mr suzuki made a fine motorcycle when you can criss-cross the hoses like that and the bike still runs :D

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
Click to expand...
Click to expand...
 
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.
 
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?
 
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!
 
Put in new spark plugs. Once they have been gas fouled (when you had the hoses wrong), they often need media blasted to work again (seeing spark outside does not mean they will fire under compression)
 
Big_Z said:
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!
Click to expand...


the diaphragm shouldnt have much to do with it (as long as the jet needle is seated properly)

when you open the carb take the fuel jets out and shoot some spray carb cleaner through the internal passages, the idle circuit and the choke circuit in particular
inspect the jets for blockages as well
 
carbs are off. #4 looks real clean as far as I can tell. i ran a wire through the holes on the jets and sprayed out any holes in the body I could find. Wasn't sure where each hole went so I don't know if any were plugged or not.

maybe i'll dip the body overnight and reassemble tomorrow...
 
Check you pickups

Check you pickups

Check the pickups on the crankshaft, had a similar problem and 1 of the 2 pickups wasnt working properly. Also there are 2 breather hoses on the carbs so be sure they arent connected to something by mistake (that was also a problem)
 
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