This is turning out to be like Jaws the movie; “just when you thought it was safe to go back in the water………...”

I originally open a thread about having problems tuning the bike after some mods I did to it. Thanks to ya’ll expertise and good advice I was able to get rid of all the kinks I found while doing the mods. The bike was running like a million dollar bike, lots of power very responsive, no backfire, no pops, very smooth and responsive.

The mods:
•      Petcock replaced with Raptor (vacuum connection sealed)
•      Dyna muffler
•      K&N filter (replacing the one in the air box)
•      Main 150, Pilot 52.5 (stock), 3 washers on the needle
•      2 turns(out) on the screw
My bike is a 2005 S40 with 2000 miles on it

So I went for a long ride this past weekend (almost 250 miles in two days) to enjoy the “new” bike. It behaved perfect, smooth, very responsive, it did great.  

When I returned home I decided to wash it just to keep it clean: took off the seat, the saddle bags, and the tank (I did not want any water to get to the top of the head) I only washed the bottom of the bike, I used a rag and clean the dust of it on the top of the bike, no problem. There was no much dirt, no oil, very clean so I just dust it. Put everything back together and now the bike runs like crap!!!!!

It does not hold the idle at all not even with the choke out, nothing. I have to keep the throttle down in order to keep the bike running. Not even turning the idle screw out makes any difference.  I can ride it but it feels funny. It’s like riding a 4 cylinder vehicle but only 3 cylinders are working. It feels funny, not the same bike I rode for almost 250 + miles for the last 2 days. The funny thing is that the mid-range seems to be fine because I put the throttle down and it goes, still very responsive but, it feels funny.

So, any clues? It cannot be the carb because the carb was working fine, all the backfires and poppings disappeared. Even now, running crappy there is no backfire or poppings at all. Besides, I have not touch the carb at all since the rejetting.

Did I accidentally disconnect something that was under the tanks?

I am so frustrated, I spent almost three weeks working on the bike and finally I had it better than I thought I could get it to work and now this. :'(

I checked the spark plug connection and it is fine, I did not mess with the carb at all or any other component. I only wash it after the long trip I took.

I should have left it dirty.  

Is there anybody that resides in or around Central Florida that can come and give me a hand?

Thanks in advance.

I agree with what he said, it's probably something very simple you just overlooked. I don't have the air box or rear fender on my bike and if I run over a puddle and suck up just a tiny bit of water, it will linger inside the carb and cause the bike to run funny( similar to what you're describing) till I break it apart and give it a quick cleaning. But as long as you use the process of elimination you'll figure it out. Just don't rule things out by assumption, i couldn't figure out why my jets kept clogging up until i found a bolt and washer inside my tank from the previous owner.

I forgot to mentioned that the Petcock was the first mod I did.
Also, the vacuum connection in the carb has been sealed.. That was the first mod I did. I modified the original posting to include that mod.
I thought the same thing first and i took the carb a parts (again) and clean it with a carb cleaner (and latex goves). Put it back together and it is still running the same.
One thing I learned was that I can dismount and take the carb a parts with my eyes close just like a soldier can take a parts his rifle.
I do not think is the carb, although like Dave says, it sounds like a vacuum problem but, there is no vacuum.

Blinky wrote on 01/16/13 at 09:17:23
Quote:

Yes, I used water but only in the lower part of the bike. That was the reason I removed the tank, to clean/dust by hand instead of washing the top of the header. No water got to the top of the bike. Never got water close to the air box either. Still, I checked the air box and the intake that comes from the box to the carb, it is all dry.
As anybody experience a crack in the top of the distributor cap (on a vehicle of course)? That when it rained or early in the morning the vehicle was running funny (due to the moist getting into the distributor) but, when it was dry it ran like a champ? Well, pretty much how the bike feels. The only difference is that the bike is dry and it still runs like crap  
But, the is no vacuum to check (it has been sealed since the Petcock mod)

I just wanted to clean the bike after the 250 + miles ride I did. It is not because it was too much dust on the bike. Like I mentioned above, there wasn't too much to clean (at the top) so I just dusted whatever dust was up there. I just did the mod of the filter (K&N) recently, about a week ago. And yes, I checked the filter too and it is OK.
Btw, this is not the first time I clean (wash) the bike. So, that's why I think something got disconected when I remove the  tank but, I do not know what could it be

I put gas on the last 30 miles of my ride. I filled up and went home cruising, no problems. I used the bike earlier in the day I washed the bike. I washed the bike in the afternoon after it was cool (like 5 hours after I last used the bike). I do not think is the gas. The vacuum port on the carb is sealed.

What about the "decompression controler"? See picture. That is the only thing I remove from the chassis (did not disconnect it). Just pulled the unit and its rubber mount from the mounting tab on the frame. And put it back as before afterwards.

What does this decompression module do?

NEVER, disconnected just pulled it from the mounting tab

SALB wrote on 01/16/13 at 12:52:09
Quote:

See my posting above:
Quote:

Per the picture below, it is called the "Decompression Module". the one attached the right side under the tank attached to the frame is the ignition module.
Btw, that picture came from the pictures on the Forum (The Motorcycle Handy Man)