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Won't go above 3500RPM

  • Thread starter Thread starter Triam
  • Start date Start date
T

Triam

Guest
So I just started another thread on this bike in rebuilds. I did a complete carb rebuild, I bought a new head and had a valve job done, readjusted the valves, synced the carb and put it back together. Now it revs until about 3500 then won't die, but it won't go past the 3500 mark. I don't really know where to put this on the forum, so I figured I start with the carb. I also suspect it could be a timing issue, or a result of a bad battery.

What should I do? :confused:
 
Got the airbox installed?

Please check the Newbie Mistakes thread linked in my signature to see if anything strikes close to home.
 
Nessism said:
Got the airbox installed?

Please check the Newbie Mistakes thread linked in my signature to see if anything strikes close to home.
Click to expand...

Don't worry. I read it when I first joined. I went through it again and don't see anything.

I started it with the pods on (this may be a newbie mistake from the PO) and it started great, but it doesn't go past half throttle without shuddering.
I then took the pods off wondering if it was too ritch. It now takes a longer time to return to idle, but it runs great from half open and above. Jetting issue? If so, do I need to drop my needle or do I need to put in a smaller main jet?
 
Triam said:
Don't worry. I read it when I first joined. I went through it again and don't see anything.

I started it with the pods on (this may be a newbie mistake from the PO) and it started great, but it doesn't go past half throttle without shuddering.
I then took the pods off wondering if it was too ritch. It now takes a longer time to return to idle, but it runs great from half open and above. Jetting issue? If so, do I need to drop my needle or do I need to put in a smaller main jet?
Click to expand...

If the bike runs to high rpm's with no air filters that indicates someone messed with the jetting. Sorry, I'm not a jetting guy, so can't help you sort it out. I much prefer to keep my bikes stock so I don't have to monkey with such things.
 
Anyone else? I am thinking I'll take the top cover off my carb tomorrow and see if anything has been done to the needle to make it sit higher. Should I do that or should I just go to a smaller main jet?
 
also, there's a washer between my c-clip and the plastic part. Is that supposed to be there?
 
Hi,

You'll find the stock specifications for most of the GS carbs in a chart on my little website. Compare those to what you have now. If the air intake system has been modified you will need bigger jets to compensate for the increase airflow. Do you also have a modified exhaust?


Thank you for your indulgence,

BassCliff
 
BassCliff said:
Hi,

You'll find the stock specifications for most of the GS carbs in a chart on my little website. Compare those to what you have now. If the air intake system has been modified you will need bigger jets to compensate for the increase airflow. Do you also have a modified exhaust?


Thank you for your indulgence,

BassCliff
Click to expand...

Thanks. I'll get on that. I think I have a 130 main jet in, and you have listed a 115 stock. I do have both a modified intake and exhaust, but this makes sense because it runs very lean on the low end, but rich on the high end. That's probably the 130 jet screwing me up.
 
Triam said:
I did answer it. I don't have an airbox. I first ran it with pods, then started it without.
Click to expand...

No, actually you didn't until now. Which pods, real ones or the lousy screen sand sifters Emgo sells?
 
tkent02 said:
No, actually you didn't until now. Which pods, real ones or the lousy screen sand sifters Emgo sells?
Click to expand...

Triam said:
I started it with the pods on (this may be a newbie mistake from the PO) and it started great, but it doesn't go past half throttle without shuddering.
I then took the pods off wondering if it was too rich. It now takes a longer time to return to idle, but it runs great from half open and above. Jetting issue? If so, do I need to drop my needle or do I need to put in a smaller main jet?
Click to expand...

They're sand sifters. Not sure if they're from Emgo or not.
 
Either find the original airbox, and put in all stock jets and have a perfectly running motorcycle or get some decent pods (K&N or APE) and start tuning the carburetors. It will take some trial and error to get it running perfectly, which few bother with. Most just get it so it fires on all four most of the time and haul ass.

Those crappy pods neither filter any dirt nor flow any air. Tuning is a nightmare, as the airflow is through them is all ****ed up.
 
tkent02 said:
Either find the original airbox, and put in all stock jets and have a perfectly running motorcycle or get some decent pods (K&N or APE) and start tuning the carburetors. It will take some trial and error to get it running perfectly, which few bother with. Most just get it so it fires on all four most of the time and haul ass.

Those crappy pods neither filter any dirt nor flow any air. Tuning is a nightmare, as the airflow is through them is all ****ed up.
Click to expand...

The original box is a few previous owners back. I'd rather go the new pods route since it'd be almost the same amount of money. I've never heard of APE pods, but I'm new to this.

As for tuning, I want this bike to be a "one kick" bike, and to run wonderfully anywhere I take it. In the meantime I'll save my sheckles and get an K&N or other filter.
 
Triam said:
As for tuning, I want this bike to be a "one kick" bike, and to run wonderfully anywhere I take it.
Click to expand...

Well you don't exactly sound like an expert carburetor tuner, if you want it to run like that, find an airbox.
It's not even the same amount of money, not anywhere near the same amount of time. Besides, 850 airboxes are cheap. Have you asked for one in the parts wanted section?
 
Most people never get it with any combination of jet changes alone. A Dynojet kit with its needles designed specifically your problem seem to be required as well, and the rest of the kit. It does seem like quite a bit of expense and trouble for little to no benefit, but many go that route.
 
simple.
over and over and over again...................................................

if you have a GS with vacuum carbs and no air box..................
*****you need a st.3 jet kit*****
all the fumble dicking in the world will not get you good carburetion from idle to redline....NEVER EVER EVER EVER.
emgo chrome screens crappers...throw them in the river...
tune it without filters as good filters will not change the tune when installed later.
jet kits are sold to add power whether it's 2% or 8%.
a larger engine with more modifications will benefit more...the more gain you will get.
 
blowerbike said:
jet kits are sold to add power whether it's 2% or 8%.
a larger engine with more modifications will benefit more...the more gain you will get.
Click to expand...

But what he wanted was.....

As for tuning, I want this bike to be a "one kick" bike, and to run wonderfully anywhere I take it.

Pretty much describes the stock airbox and jetting.
 
tkent02 said:
But what he wanted was.....

As for tuning, I want this bike to be a "one kick" bike, and to run wonderfully anywhere I take it.

Pretty much describes the stock airbox and jetting.
Click to expand...

i disagree..
i have installed way to many st.3 kits.
and...
and...
if he don't have a usable airbox then what?
buy some rock hard rubber booted piece of crap and fight to get it to seal?
i have done at least 2 850's with pipes and st.3 kits...
the seat of the pants feeling was good as far as more power and perfect carburetion from idle to redline.
for under 200 bucks he can get good filters and a jet kit and call it done.
that's all i'm saying.
if he had the stock parts then put them on but....he don't.
 
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