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Quick question: 1978 GS1000 Carbs

  • Thread starter Thread starter mattfeet
  • Start date Start date
So now its time to do fuel adjustments. Use the side mixture screws to lean the cylinders out. On my bikes I have found that between 1 1/4 out and 1 1/2 is where the plugs seem to like things.

Since you have VMs and the Colortne works super with VMs, I would volunteer use of one of my Colortunes should you want to go that way..or if noone you know has one for you to borrow.

What i do turn the screws in till i start getting the lean whitish blue color and then out till i get the orange yellow rich color..noting how far each screw is turned. Then i go in half of what it took to get from lean to rich. Then ride and see how it performs as far as power, throttle response, any lean or rich exhaust popping...that sort of stuff.
 
Well, took her our for a ride with the new plugs and it was a night and day difference. Came home and header temps were as follows:

CYL 1: ~235*
CYL 2: ~205*
CYL 3: ~230*
CYL 4: ~242*

CYL 2 is still running a bit low but the bike pulls like a freight train now. Still have some minor adjustments to make but overall Im pleased.
 
Looks like you've got it pretty much sorted. A little tweak on #2 like maybe 1/8 turn in to get rid of the that bit of richness should bring that temp up a bit. Thanks for the quick tutorial on the Color Tune Chuck. I've got one but never could really get to work good for me but I was only turning the screws a little bit each time so I put it back in the cupboard. I tuned it by ear and plug checks and it is running great but a little finer tweaking is always good.
 
I do small ( like 1/8 turn ) adjustments too once I find that center spot between the yellowish orange rich color and the whitish blue lean color. The cylinder has to have a few seconds as your tweeking to equalize out too.
 
Where are Dyno jet stage III kits available at for a 78-79 GS1000?
I looked on the Dynojet site and nothing shows up?.....only for CV style it seems
Would I need kit #3304 ?

I think I got it figured out....#3304 is being discontinued on Dynojet website, but still available as old stock many places...
 
Last edited:
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