got my bike running for the first time yeterday since fall and it ran fine. rode to the gas station for some new gas. everything was fine and dandy. today i put in my new rear shock and had to remove the airbox. got everything back together now and the bike runs horrible.

it has no power and was shooting flames out of the exhaust. i put new plugs in yesterday before i started it. im not sure whats going on. pulled my plugs out and here is what i found.





what would cause the right side to be so black? could i have messed something up when putting the carbs and airbox back on?

..... Yes ... Right side plug looks horribly rich! .... Check your airbox to carbs seal thingy and clamps etc ... Reckon you have an air leak from a tear or pinched edge there somewhere?

Actually, an air leak would cause it to run lean. But you're on the right track Janx.

First thing I would look at is either your float height on the right carb (too high and flooding the cylinder) , or maybe a weak spark on that side (swap the plugs left and right and see if the problem follows the plug).

I agree with the weak or intermittent spark idea, if gas is not firing than swap coils


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Right is richer than Warren Buffet, left is leaner than Gwen Stefani.

WTH ... I've seen some weird crap one carb to another, but this takes the cake

You have a vacuum leak ? on the 89-00 bike vacuum line is off the left carb ... if that line has a hole in it you can lean the left more than right, but you'd only run on prime in that case.

I have to read your post more slowly ... I'll post back.

Cool.Buddha.

You pinched some hose getting the airbox out and back in ... or you have a stuck choke or float or something like that is my guess.
It ran fine with the old gas, and craps out with new gas ? That's a first as well.
Cool.
Buddha.

Quote from: The Buddha on April 07, 2014, 06:29:07 PM
Right is richer than Warren Buffet, left is leaner than Gwen Stefani.

WTH ... I've seen some weird crap one carb to another, but this takes the cake

You have a vacuum leak ? on the 89-00 bike vacuum line is off the left carb ... if that line has a hole in it you can lean the left more than right, but you'd only run on prime in that case.

I have to read your post more slowly ... I'll post back.

Cool.Buddha.

the plugs from my spark plug thread look like this as well but left looks rich and right looks lean on my Gs

NEWBIE

Rex, what really throws up some flags, is that the airbox was removed.  Do you remember what your old plugs looked like since you just swapped them out recently?  ... Did you have white plugs before or black plugs before?  That would tell us what to look for on which side, and what you had going on prior to this issue... my guess is that both were rich or both lean, and now with the recent work, something small went awry.

- Bboy

Quote from: newbie1993 on April 07, 2014, 08:32:41 PM

the plugs from my spark plug thread look like this as well but left looks rich and right looks lean on my Gs

NEWBIE

If the floats are equal and the air screws are equal, and you ahve not boogered the air screw seat and passage by over tightening it ... then on an 89-00 bike you can have a tiny hole in the frame fuel tap vacuum diagram letting gas over into the vacuum line. To test if that's the case, cap both ends of that line and run it in prime and read the plugs after a few mins.
Cool.
Buddha.

ill have to check and see if i have any leaks. it really sucks i dont have time to do anything for like 3 weeks but ill be in vegas so i guess that makes up for it. heres a pic of the old plugs. i dont know which is left or right but they both look the same to me. ill have to check everything out when i get back. the clamps for the carbs to the airbox were pretty bent. i used a steel cup and got them round again but that might be causing the problem.

they both like like they've been running lean.

not really sure where to start    ive never worked on carbs before.

alright guys. i had a bit of free time after dinner tonight so i figured id do a little more investigating. i found something interesting an also have a few more questions. lucky for you i like pictures. def alot easier then me trying to explain right?

so i opened up the top of the right carb the one with the black plug and found that there is two short springs in the slide instead of one long one.
this cant be right?

next i have a question about the frame petcock tubes. there is one hidden behind another. you can see in the pic below. now is this suppose to be connected to a tube with a T in it? if so does it actually connect to anything? mine has always just been sitting between the right an left carbs.


i checked both sides to make sure each was getting good spark and indeed was.

unless there are different frame petcocks for older/newer bikes ... or in different countries? ... that doesnt look like a OEM petcock?

but i have heard some of the guys here refer to a pingel petcock?... never seen one though..

and though i dont know specifically... i would think that .. yes that t joint is supposed to go somewhere?.... or its a blank and has been jammed into the pipe just to block it?

yeah i couldnt figure it out when i was putting everything back together after the shock swap. i havent see any other petcocks before so not sure if thats right or not either. its hard to read the tube chart to. so much going on in one little photo.

ok.. found this image... says its a pre 2001 petcock .. looks just like yours...



whereas my '06 petcock looks like this on the left ... the right side thing is the fuel tank petcock



is it this photo you looking at for vacuum hose routing?..... its one of the clearer ones for me to understand!?

and a link for Kerrys page .. if you havent seen it already!

http://gstwin.com/fuel_hose_routing.htm

Quote from: Janx101 on April 09, 2014, 07:35:38 PM
unless there are different frame petcocks for older/newer bikes ... or in different countries? .................

There are 3 different kinds older, newer, and the in between 01-02 ones like I have.

awesome! both helped. my bikes older yeah. so that hose coming off the frame petcock is just left open so ill take that white T out.  ill have to get another hose for the one that goes over the airbox an figure out where it goes. hopefully this is my issue. got new springs ordered and new clamps for the carbs and airbox.

Quote from: rexpepper651 on April 10, 2014, 07:05:47 AM
awesome! both helped. my bikes older yeah. so that hose coming off the frame petcock is suppose to go to the left carb and  ill have to get another hose for the one that goes over the airbox. i dont have that one at all. hopefully this is my issue. got new springs ordered and new clamps for the carbs and airbox.