I just installed some 4kgsk and i tighted them to what they were factory .124 and .168 and how when i rev it up or drive it the throttle acts like its getting stuck but its not it seems to be in the springs. I think i need to losen em but how much? Do i need to adjust them so they are even? Truck revs fast and smoth just tries to run away after 2000rpm and ides?

thanks,aron

 

Without knowing the spring tension it is a guessing game at this point.
I jumpy throttle can be either loose or tight spring tension. My guess is tight.
Without measuring, you need to tighten the nut until the big top retainer holds the springs and then tighten another click or two (¼-½ turn).

Factory spring tension may not be the same on both sides. The best way to start with a GSK is to set both sides the same and see how it runs. Some trucks are good on the first setting and others may take a little trial & error.

I've done 94-98 manual & auto GSK installs. My observations is that 94-94 tend to be very loose factory setting while 96-98 manual tend to be tight. 96-98 autos are usually pretty good.

BTW, did you remove 2 seats from each spring stack?

 

The 2 seats? I removed the little one but forgot about the big washer one. I removed them and installed the 3 springs. I just need to adjust them a little more. I have them a little to tight because it idles about 1050, and the throttle still catches.

 

Make sure you get all the original springs and seats out. Then set the new springs to the exact setting that they were before, even if they were different measurements. Always has worked for me and I have never had to go back in and adjust or reset the idle.

 

... i have been wondering if all of ya'll have removed the head when doing valve springs after the 4kgsk, or is there a trick on how to do it with the head on...
thanks and sorry for jumping in...
john

 

you can set the pistions to top dead center than use a spring compressor to compress the springs.

I got the springs set but now at 1000-2000 rpm when i drive sloc and hold the throttle the motor revs and drops on its own. Do i still have the springs to tight?

 

Didn't mean to post & run. I'm not getting email notices for some reason.

I made an assumption (possible wrong) that your GSK included new seats. Some kits only have new springs and not seats.

If your kit involves seats it is (usually) a 1 piece replacement. Factory seats are a 2 piece design. A common error is not removing both factory seat pieces.

All GSK replace the inner 3 springs (not the large outer spring) with either 2 springs for 3k or 3 springs for 4k.
The stud protrusion may be different on opposite sides due to assembly variances. Spring tension is usually the same or very close between the side.

You now have throttle surge or flutter. This is the engine speed where the governor is alternating between the idle (large outer) spring and the inner springs.
You have a manual so an easy answer is to downshift.
If you want to try spring tension, I suggest loosening one side a single click and driving it some more.
Very possible it will not go away. The downside of GSK is throttle flutter.

I have it at the 1200 rpm range, too. I've adjusted many times and finally set it at a point that is bearable. Anything tigher and the throttle was jumpy. Any looser and the throttle was sloppy.

After doing several GSKs and getting baffled by the variances, I called Piers and had a lengthy discussion. He confirmed my observations.

-John

 

yep one of the problesm with 4 k gsks is jumpy throttle...it just takes some time adjusting...u may have to dig into it 2 or 3 times to get it right...lots of guys have had this problems with the 4k

 

when i put in my 4k gsk, i put them both at the factory settings. one side was .062 and the other side was .127!!
Put them both back where they were and i have not had any problems.
Only raised the idle about 100rpms so i am very happy!
SOUNDS AWESOME AT ABOUT 3800-4100 rpms.!!!!!!!!!!!!!!!! Pulls hard to 4050 rpms.

 

This is true

if you are certain that they are even, back off a click at a time on the governer springs till it is just right, You can also check the wear and tear on the throttle cable as well to give u an idea as towards whats goin on if you have a sticky throttle...

I had to go back into my GSK at least four times the last time to get it right...

Rick

 

Sticky throttle

if it seems that the RPMS hang per say, as an example, mine used to come down really slowly from 1500 rpms to idle point, id say back them off a click each time, rebuild everything and see what gives..

Rick