'bout ready to part this thing out!

[jlvdo]

SYMPTOM- starts up fine, idles fine. Accelerates to ~2500-3500 RPM, then craps out, in every gear.

I am having what I believe are carb issues. I have checked ALL the carb threads-- NO LUCK. I've rebuilt the carbs, increasing the jet sizes (w/help from Z Ent.) due to altitude (1 mile). Pilot air screws out to 3.5 turns (from 2). Floats are at 22.4mm +/- 1mm. Carbs balanced.

'Only other significant change is the dyna 2000- installed per instructions.

HELP!:-&

 

[TheCafeKid]

Uhmmm which bike? Pipe and Pods?

 

[Nessism]

Altitude requires leaner jetting, not richer.

 

[cyclefvr2]

you dont want any over 2.5 turns ,that means it needs jetted,and a good filter, i would start there, check the jet needles for looseness
it sounds like a fuel starvation issue, what do the plugs look like

 

[Guest]

Are you running stock coils with the rich condition you've created by jetting for lower elevations?

 

[jlvdo]

you dont want any over 2.5 turns ,that means it needs jetted,and a good filter, i would start there, check the jet needles for looseness
it sounds like a fuel starvation issue, what do the plugs look like

Are you running stock coils with the rich condition you've created by jetting for lower elevations?

The 1980 GS750E has coils by Dyna, with pods and a 4 to 1 pipe. The way the bike pulls up to ~3k and sounds when it craps out feels/sounds like a fuel starvation issue. Last I checked the plugs, they looked a little dark, but not carboned up or wet.

 

[TheCafeKid]

The 1980 GS750E has coils by Dyna, with pods and a 4 to 1 pipe. The way the bike pulls up to ~3k and sounds when it craps out feels/sounds like a fuel starvation issue. Last I checked the plugs, they looked a little dark, but not carboned up or wet.

Why did you jet it by hand?? Its a effort in futility honestly. I tried and tried and tried on my 1100ES, and it was simply maddening. Get a Dynojet kit, install it, and be done! No guess work, no playing around with jet sizes, no fighting with the bike.

 

[reddirtrider]

Why did you jet it by hand?? Its a effort in futility honestly. I tried and tried and tried on my 1100ES, and it was simply maddening. Get a Dynojet kit, install it, and be done! No guess work, no playing around with jet sizes, no fighting with the bike.

The definite answer.

 

[Big T]

The definite answer.

You and Josh assume too much

He may just have air leaks

So, the question is, did it run okay before?

Did you just add the 4-1 and pods?

 

[TheCafeKid]

You and Josh assume too much

He may just have air leaks

So, the question is, did it run okay before?

Did you just add the 4-1 and pods?

Im not assuming ANYTHING...i am just going on what he just told us. He tried to jet CV carbs for the street, by hand, with pods and a pipe. Its a waste of time, it will never be right, and it will only continue to frustrate him. The needle MUST be adjustable, or it simply is going to fall on its face once it gets into it.. :|

 

[Big T]

But you're assuming he just added the pipes and pods, which he doesn't tell us.

It may have run fine before, we don't know.

So, JLVDO, more history!

Did you just add this pipe and pods? (If you did TCK is spot on)

Was it set up with the pipe and pods before and ran okay, but now you're trying to compensate for problems you're experiencing?

 

[TheCafeKid]

But you're assuming he just added the pipes and pods, which he doesn't tell us.

It may have run fine before, we don't know.

So, JLVDO, more history!

Did you just add this pipe and pods? (If you did TCK is spot on)

Was it set up with the pipe and pods before and ran okay, but now you're trying to compensate for problems you're experiencing?

Sorry man, didnt mean to come off as jumping you, just I know that he just recently got this bike back together, and the pods and pipe are somewhat of an experiment. I also know, that for whatever reason, as amazingly knowlegeable as he is, Jeff at Z1 is for some reason against installing jet kits, so in talking to him, Jeff has probably told him which mains and what not to go with. While he is probably VERY right in that respect, the fact remains that the stock needles, unless shimmed (and that is a PITA, takes alot of experimentation and yadda yadda) will simply not do the job with the combo of the pods and pipe. They are too slow to feed the fuel thru the midrange (tapered too long) and the bike will run up to about 4 grand WITHOUT SLIDES, after that, its going to trip like Dick VanDyke over the automan.

 

[Big T]

Sorry man, didnt mean to come off as jumping you

Same here, but you have the secret inside knowledge that was not divulged in the post


And, don't you have a job, you're posting every few minutes here!!

 

[TheCafeKid]

Same here, but you have the secret inside knowledge that was not divulged in the post


And, don't you have a job, you're posting every few minutes here!!

I DO! I just work nights, and Im off today Just taking a break before heading back out to the shop, and the store, and cleaning...etc etc.

 

[errorcauser]

No way i'd part that bike out. I'd go to my grave with a carb in one hand and a screwdriver in the other if thats what it took.

Thats a good looking bike.

 

[trippivot]

is your advancer unit free and snappy? this will have you falling on it's face when it needs to be 30 or so degrees before T.D.C. unlike at idle when 8~15 degrees is just fine.


just another thought..that is not fuel related.

1.fuel
2. compression
3. timed ignition
any problem is in these areas

 

[mottyl]

If it makes you feel any better, I have that exact exhaust with the stock airbox and my bike won't rev over 6k.

What I need is another bike so the Kat can come off the road for some major work.

Chris

 

[jlvdo]

The bike came with pods (cheap ones) and the aftermarket pipe. But, it never ran. As you can see from the pic, which was basically all the parts thrown together to show what I started with, it wasn't in such good shape when I got it. The coils, and in fact the whole charging and firing system is new-including a Dyna 2000 w/coils and new plug wires.

Given the symptom of accelerating up to ~3K rpm, and crapping out, but able to keep on going when I pull the choke, my guess is its a carb issue. It also sounds starved when it craps out at above rpm. I was unaware of the dynojet option. I was in carb hell trying to figure out how to raise the slides.
Ah hell, whats another hundred plus for the new carb kit?! But, hopefully, it'll run. Otherwise, get the grave ready, I've the carbs and the screwdriver ready.
Thanks for the input, everybody.

PS- Hey CafeKid, you still happen to have that pillion handle by any chance?