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gs1100e stumbles at WOT

  • Thread starter Thread starter chobint
  • Start date Start date
chobint said:
Well I found that one of the emulsion tubes is different from the others (Pictured on the right). The large hole at the top is smaller than the others, and the 4 small holes are larger than the others. This anything to worry about?


Click link to see the full sized image:
http://i27.photobucket.com/albums/c179/chobint/cannon096.jpg~original
cannon096.jpg
Click to expand...
Yes it is
I have a stock needle jet (emulsion tube) for you.
 
chef1366 said:
Yes it is
I have a stock needle jet (emulsion tube) for you.
Click to expand...

PM send regarding needle jet.

Otherwise, I finally got some results tonight! I upped the main jet to 140, needles at 2nd highest position and now I only get hesitation at 5k rpm. Once you get beyond that point, it rips pretty clean and hard. Before there were other noticeable flat spots. The downside is that it won't idle without just a pinch of choke. Mixture screws are at -4.5 turns. I pulled the filters and noticed that there are 160 pilot air jets (optional, according to dynojet specs). In my amateur analysis, it sounds like the bottom end is a bit lean? Ugh this is fun but exhausting.
 
I called dynojet and they don't make a DH170. I sourced some OEM ones and they are 11 bucks a pop (ouch). Any recommendation on an aftermarket source?
 
I got the idle dialed in pretty good tonight. 1100rpm is as low as I could get her with the idle remaining resilient to load and throttle fluctuation. Anyway, I will stop posting for a while till I get the parts needed to continue.

Here's a vid of her idling tonight. Clicking will send you to photobucket
 
mrbill5491 said:
Is there no baffle in that pipe?
Click to expand...

I'm pretty new to this, so I'm going to let the pictures talk. The straight pipe you're staring down ends at some point and then everything beyond that curves, so there's not much to see beyond the blackness.

motobaffle003.jpg
 
Well, I got the stock needle jet installed. I've been on and off my bike a couple 20 times trying to get the mixture dialed in (fail). I think I will drop the needle one tick, such that it is in the default position (ala dynojet kit specs).

I do have a few questions regarding mixture screw tuning.
How long does the bike need to run for the plug color to indicate mixture? Are there any key milestones I should be looking for while dialing in the mixture? I noticed that when the mixture gets rich at idle the exhaust has a mellow blubbering sort of noise, kind of like a v-twin.
 
After many failed attempts to dial in the mixture, I fouled set of plugs yesterday. I gapped some new ones (.635 metric) and put them in. The bike started for a few minutes, then slowly started to die and then absolutely refused to fire. Various choke levels, mixture and idle screw. Nothing. WTF MATE. I gave up for the night.

Today, I drain the bowls. Prime for a few minutes. Boom it starts right up... flooded carbs I guess? About an hour of tweaks and I seem to have gotten the mixture close. Idle is resilient but has slight gallop and not as low as I'd like. Early pickup is very sharp, and the mid to upper was good enough that I think I'm going to need new suspension and better front brakes. The top end lacked that exponential burst of power I'm used to on sport bikes and there is just a hint of hesitation at moderate RPM under high load. More riding tomorrow will give a better understanding of the current tune. I'm thinking a sync would be the next step at this point?
 
you need to be tuning with the 28 dollar air filters REMOVED.
then buy a set of K&N look a likes.
trust me the emgo filters will f you up as it will affect all tuning your doing.
from the video these look like the chrome screen filters...
if i'm wrong please correct me.
 
i have said this many a time and here i will say it again.
the emgos are 28 bucks for a reason.
they are small and odd shaped..the f up the air entering the carbs.
i had a customer bring me his 16 valve GS and i went through the carbs..
road the bike and it didn't change one bit.
pulled the carbs and double checked...everything was great.
rode it...still messed up.
i pulled the emgo's and rode it...BAMM!!
ran great everywhere!
called his dumb azz and ask if when the problem started..uhuh.
it started running terrible after his ebay emgo purchase.
he felt stupid and yes i still charged him the same $$
on an 8 valve maybe they are ok but i know 100% for sure 16 valve engine/carbs hate them.
lesson learned.
 
RE: Air filters. Between my inexperience and the odd mismatched needle jet on this bike, I was ready to run the damned thing off a cliff. That said, now that this bike is running reasonably well, I think some new filters are not out of the question. Chef inquired about filters earlier in this thread. I had not considered that cheap filters do not have nice laminar flow inside. Anyway, my fingers still smell like gasoline, I think its time for another shower.
 
Well I caved and ordered a set of K&N pod filters. I was eyeing the progressive suspension upgrades too, but decided to pass for now.

I ran the bike pretty hard last night. She runs good but not perfect. I noticed that when I went easy on the throttle, then tried a moderate roll on that the slides wouldn't lift properly and the bike would hesitate. However, if I jumped on the throttle right away the slides would slam wide open and she would rip hard. By the end of the night I felt comfortable enough to pull a couple of clutchless rev limiter bump shifts. Felt good.
 
Holy crap batman... the K&N pods, like a silver bullet from the motorcycle gods, seem to have resolved all of the remaining engine issues. All the flat spots are gone, the idle is smoother and low throttle popping is significantly reduced.

Now my clutch is slipping under hard accel. The rotors are warped and the brakes are super spongy.

Thank to everyone for help. I think she's finally running the way I had expected.
 
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