1/8th throttle spudder stutter

[kurt112345]

Alright I ordered some jets and some 47.5 pilots, I confirmed I had 45's and here I thought I was all done. I will post when I get them in. I have the carbs off already just waiting:-\\\

heres a pic of my bike when I thought I was all done.

 

[posplayr]

Alright I ordered some jets and some 47.5 pilots, I confirmed I had 45's and here I thought I was all done. I will post when I get them in. I have the carbs off already just waiting:-\\\

heres a pic of my bike when I thought I was all done.

That is very clean. I had an 1981 GS750E and I used that paint scheme on a repaint.


Also not in the other thread going on about rejetting that the Dyno Jet kits and the factor pro kits are significantly different.

I don't know how much you have been riding it, but at least the pipes do not look all cooked.

That GS750 was close to stock, with air box and 4:2 but I had put in the 1100 intake cams (same as yours) and had the same K&N filter in the airbox with cover on. I had to increase the main jet about 2 steps over stock. It had been a little lean before with just teh K&N, but the after the cam it has a noticeable hunt at 1/8 throttle that went away with more main.

 

[kurt112345]

What do you guys do for the crankcase ventilation that comes out of the valve cover with pods?

 

[posplayr]

Catch can; elegant special purpose or no so much plastic containers.

 

[Guest]

I use a cool whip container with a special hole in it and a K&N chrome filter. They almost cancel each other out.

 

[kurt112345]

Having problems picturing whats its suposed to look like, any one picture or link on what its supoused to look like?

 

[posplayr]

Bill you have a picture?

 

[kurt112345]

Would one of those little breather filters work? put like a 90 degree elbow pointing the filter up.

 

[kurt112345]

ok I see know, I have a empty can of brakcleen put a hole on the side towards the top attach a fitting and put a little breather filter on the other side of the top of the can.

 

[Guest]

Bill you have a picture?

I'm too embarrassed! You have the pretty one.

 

[kurt112345]

so far have it all back together, with pods know, 47.5 pilot jet, dj 138 mains and needle back to 3rd spot per dynojet instructions, a/f screws 2.5 turns out. I haven't done tuning yet again with a/f screws but initial impressions are very poor, with idle screw out all the way still idles at 1300rpm, popping/backfiring back out the carbs, will fiddle with it again in the morning sure my neighbors here don't like me tuning my bike at midnight.

 

[posplayr]

Check for air leaks and that boots are all tight . I assume your ignition timing is close. Are you saying you can not turn down the idle below 1300 without it quitting? Did you clean the carbs? You really have to make sure all passages are clean. I guess you just put in new 47.5s so they were probably clean.

The other area is ignition. Have you checked the voltage to your coils . An 1100 needs good voltage . Generally a coil relay mod is required unless you are really dilegent cleaning all of your switches. My 1100 was a had start at less than 11v to the coils.

The other thing is card sync. Are they close? There is something else going on that is not jetting.

 

[kurt112345]

Alright update time, started it let it warm up, checked my carb sync #1 carb was out a little dialed it back in, know they are pretty close with in a 1lb of vac of each other. idle is good its dialed in right on 1000rpm you rev it doesn't want to die or anything after, just comes down and holds at 1000rpm, iam right about 3 turns out on a/f screws. throttle response seems good for cv carbs. Know to the issue was having originally 1/8th throttle sputter, its mostly gone, the difference know with the new setup is they point at which it does it, the most is right around 3500-4000rpm spot rather then 2500-3000rpm and its less noticable . It pulls hard all the way till redline 9500rpm no issues there, still has that slight hesitation when the needles raise up if you wide open from a stop but iam guessing that's just cv carbs. I did notice I forgot to put back the dynojet washers on the needles like the instructions say but seeing my symptons iam thinking the needles need to come up a notch? 3rd from bottom. what you guys think? iam guessing dynojet washers will lean me out.

disregard the last post of issues, them seem to all clear up. idk iam ok with it though

 

[Guest]

Removing the washer is like richening it 1/2 notch.
I would richen the needle one notch and add the washer.

 

[kurt112345]

Update: Moved the needle up a notch and 3500-4k problem is gone, everything seems to be be good, only thing left is just a tiny hint of a stumble less then 1/8th throttle but iam guessing is a/f screws, I haven't finely tuned them there just sittin 3 turns out. so iam thinking case closed:clap:

 

[posplayr]

Update: Moved the needle up a notch and 3500-4k problem is gone, everything seems to be be good, only thing left is just a tiny hint of a stumble less then 1/8th throttle but iam guessing is a/f screws, I haven't finely tuned them there just sittin 3 turns out. so iam thinking case closed:clap:

Good to hear it. :clap:

 

[kurt112345]

http://www.thegsresources.com/_forum/showthread.php?t=222788

link to my current issue. other thing i noticed is everyonce in a while i get a little backfire threw the carb well one of them, heres all that ive done

Carbed dipped carbs
double checked cam timing and valve adjustment
double checked ignition, static timing check
put new carb boots on and clamps (should be no air leaks)
high idle method on a/f screws
and triple checked carb sync with carb tune.

final jetting
mk 132.5
47.5 pilot
3rd clip from bottom on needle
dh160 air pilot jet


Iam kinda at a loss, it does run well other then idle

Think iam going to return to stock everything and start over.

 

[Guest]

http://www.thegsresources.com/_forum/showthread.php?t=222788

link to my current issue. other thing i noticed is everyonce in a while i get a little backfire threw the carb well one of them, heres all that ive done

Carbed dipped carbs
double checked cam timing and valve adjustment
double checked ignition, static timing check
put new carb boots on and clamps (should be no air leaks)
high idle method on a/f screws
and triple checked carb sync with carb tune.

final jetting
mk 132.5
47.5 pilot
3rd clip from bottom on needle
dh160 air pilot jet


Iam kinda at a loss, it does run well other then idle

Think iam going to return to stock everything and start over.

If you are certain you have no air leaks than take out the idle mixture screw a half turn.