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78 GS1000E carb question

  • Thread starter Thread starter Jackrp
  • Start date Start date
J

Jackrp

Guest
I need to know a good starting point for the 2 screws (mixture/idle), this bike runs great after coming off idle to redline, but when I pull up to a stop it will idle at 2500 to 3000 rpm for a few seconds then die unless I keep reving it not to mention the low speed hesitation off idle, if I adjust the big center screw to keep it running it will only idle at 4000+, It idles smooth and steady at an acceptable rpm while on choke.
 
Sounds like the "two screws" are set about right. :eek:

Sounds more like your problem is an intake leak. One of the more notorious locations is the o-rings between the intake manifold and the head. Replacements are available from cycleorings.com.

If your bike is basically stock (stock airbox and exhast), start about 3/4 turn out on the fuel screw (the lower one) and 1.5 to 2 turns on the air screw (the upper one). If you have pods and/or a pipe, start with a full turn on the fuel screws.

.
 
Last edited:
Steve said:
Sounds like the "two screws" are set about right. :eek:

Sounds more like your problem is an intake leak. One of the more notorious locations is the o-rings between the intake manifold and the head. Replacements are available from cycleorings.com.

If your bike is basically stock (stock airbox and exhast), start about 3/4 turn out on the fuel screw (the lower one) and 1.5 to 2 turns on the air screw (the upper one). If you have pods and/or a pipe, start with a full turn on the fuel screws.

.
Click to expand...
Just got thru with a head refurbishment,new rings with a good honing,new carb boots and orings, this motor is tight, stock airbox setup
 
That is classic air leak symptoms but if you've got those bases covered I reckon you're in to a carb strip / clean and rebuild. Even if your idle settings are quite a bit out you should still get an idle with those settings, just a bit rough maybe. Possibly blocked pilot jets (or heavily varnished).

Or, and this is a bit clutching at straws, carbs are way out of synch. Or possibly a sticking advance / retard mechanism on your timing?
 
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