1978 GS 1000 with 4in1 and stock exhaust - jets & settings?

[tkent02]

Since I have never done this before, I know the Main Jet should have been self-explanetory...but since it is directly attached to the needle jet, I didnt know whether that had to be changed out also.

It's not. The needle jet stays in the carb. The tube the main jet screws into is not it.

[allojohn]

When reading up on bench syncing it implies that there is a way to change the heights of the floats.... but mine are already fixed in place with bolts that go through the throttle pulley knob. (VM 26mm)

Are you mistaking the slides for the floats? How about a picture or two.

The floats are under the carbs in the bowls.

[Big T]

Are you mistaking the slides for the floats? How about a picture or two.

The floats are under the carbs in the bowls.

Yeah, that bracket that pivots on the pins with the two floats attached to it

Height adjustment there is critical


The height of the slides is changed by loosening that nut on top and screwing the bolt in or out - that's how you sync the slides, whether on the bench or with the sync tool

[Gregory]

Yes i am sorry i did mean slides, they are fixed to the throttle assembly.

I put everything back together and guess i will try starting and "tuning it" (according to the instructions)tommorrow afternoon.

[hampshirehog]

Yes i am sorry i did mean slides, they are fixed to the throttle assembly.

I put everything back together and guess i will try starting and "tuning it" (according to the instructions)tommorrow afternoon.

The slides are adjustable and you need to do a bench synch before you put things back together. The manual shows you how to do this plus if you take a look at the pages below you'll see wherethe adjuster and lock nut are:

http://members.dslextreme.com/users/bikecliff/images/vm_carb_rebuild.pdf

[allojohn]

Yes i am sorry i did mean slides, they are fixed to the throttle assembly.

I put everything back together and guess i will try starting and "tuning it" (according to the instructions)tommorrow afternoon.

You're worrying me, you have set the float heights, right? I think they should be 24mm. Incorrect float heights are the source of many aching heads on this forum, you must do them right if you are to stand any hope of getting your machine to run right.

[Gregory]

You're worrying me, you have set the float heights, right? I think they should be 24mm. Incorrect float heights are the source of many aching heads on this forum, you must do them right if you are to stand any hope of getting your machine to run right.

Yes I measured the floats corectly and they are at 24-25mm.

[Gregory]

The slides are adjustable and you need to do a bench synch before you put things back together. The manual shows you how to do this plus if you take a look at the pages below you'll see wherethe adjuster and lock nut are:

http://members.dslextreme.com/users/...rb_rebuild.pdf

I have been using these instructions, and do not understand the part (16.) about the manual sync FULLY CLOSED POSITION and FULLY OPEN POSITION instructions..... cant figue out "slotted screw" etc.

BUT, when I open the sldies all the way all are the same distance from the top, and when I close them they are all about 1-2mm airspace from the bottom.