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2 cylinder

  • Thread starter Thread starter 85gsjim
  • Start date Start date
8

85gsjim

Guest
ok well i have a 1985 gs700e with about 18k i recently pulled and cleaned the carbs all new o rings,intake boot o rings and boots, float bowl gaskets ect. it runs and idles now but i think its only running on 2 cylinders cause when i was setting the mixtures with the colortune cylinders 1and 3 seemed lean so i felt the pipes and they were cold while cylinders 2 and 4 were hot. theres spark cause i see it with the colortune. i pulled the float bowl screws and gas come flowing forth. i dont really know where to go from here cause i know very little about bikes. i look forward to hearing your ideas thanks.i have also done a valve check.
 
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Most likely you didn't get them clean enough, something still clogged up.
 
the carbs seem really clean the little jet in #3 was clogged but #1 looks all clean. #1 and #3 carbs are the ones with the vents could not having a line on them affect them?
 
thats only the vent lines so the fuel can flow into the bowl

other than the clean jets, you need clean internal passages in the carbs, and for that you need to take them off and spray all the passages with the pressurized carb cleaner (as a minimum)

try running the bike with the throttle open a little and see if the other two cylinders fire
 
i tore them down and dipped them in berrymans overnight before i put the new orings and gaskets in. when i was tunning the mixtures if i revved it i would get a yellowish flame somtimes as opposed to no flame.
 
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run it with the throttle open till it warms up and see if it idles
make sure the idle knob is set accurately and the carbs are bench synced, that there's no leaks at the intake boots and that the airbox is sealed as well
 
At this point I wouldn't go any further without doing a compression test.
 
I am assuming you have replaced the plugs or at least disconnected the plug wires during your testing. may be stating the obvious but check plugs 1 and 4 should be paired on one coil (usually the left) and plugs 2 and 3 should come from the other (typically right).
 
the carbs have been bench synced as well as synced them with a carbtune. How would i go about doing a compression test?
 
yes i set the float levels. does anyone know if i can do a compression test with the carbs off or if that could skew the numebers?
 
A compression test without the carbs on would be PERFECT. :dancing:

If you do a compression test with the carbs on, you have to hold the trottle wide open, anyway, so having the carbs off would be the ultimate in NO restriction.

.
 
so i finally did a compression test with the following results cylinder1:140psi, cylinder2:100psi,cylinder3:125psi cylinder4:130psi. im not sure what to make of the result, the standard from the manual is 130-185psi with a limit of 100psi and a difference of less than 30. does anyone think this could be the reason its only running on two cylinders
 
somewhat large diff between #2 and other cylinders aside...

if you have spark and if you have fuel with those compression numbers the bike should run
ok, maybe rough only, but all the cylinders should fire

now, how did you warm up the engine to do the compression check if two cylinders are NOT working ?

maybe a time to repeat saying what exactly the symptoms are (cause everything posted above doesnt make sense when put together)
 
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