Ok i have rebuilt my 99 gsxr 600 from the ground up but im stuck as to where the master carb (#3 from left to right) hose plugs into? I know its a vacuum hose and i just have no idea where it goes.... i have my solenoid's plugged in, my air box hooked up correctly, and this vacuum hose is the only thing i have no idea where it goes... my service manual says nothing about it and ive looked over every forum and image i can and still can find no one with any relation as to where it goes... someone help!!!
See i thought maybe the same thing but this is an engine side vacuum port so if it pulled extra fumes from the tank and put them on par with the cylinder wouldnt that cause bad strokes and make it run super lean?
I think you misunderstood what Racer said.
He didn't mean the tank vent, he meant the petcock which is the vacuum operated shutoff which allows fuel to flow to the carbs.
Aaah ok well i have a new tank coming in which came off of a 99 750 fi. But if looking at that tank is that the left or right nipple coming off the back? Sorry if im seeming like noob about this... but ive rebuilt this thing coming from the frame up cause the kid who owned it before me destroyed this bike from negligence and im trying to put back a puzzle with almost no parts and new parts i order.
It will be a valve on the bottom of the tank that will have a port to hook up a vacuum hose and an outlet for the fuel to flow to the carbs.
I think it should say on and reserve but it's been so long since I looked at one that I'm not sure.
Well thankyou all your advice helps and i appreciate the quick responses! Just on the bottom of my tank the only thing that connects to it is the fuel pump. Is this something that goes on the engine side of the frame that connects to back of fuel tank and to that nipple coming out from under the carbs?
Ok i see what you're saying. But my tank has only one line that comes out and it is strictly for fuel so i think it might go to a 3 way "petcock" that goes from fuel tank to petcock where the hose connects to then to carbs
Ah yes i guess the previous owner of the bike has eliminated it completely and just had a hose attached to it. Thankyou guys im new to the motorcycle world and am rebuilding this bike from nothing and im in the last stretch i just didnt know if plugging it would cause a lean condition and not allow it to work properly! But thankyou all again for the help! Ive been using the forum as a guest but now that im a member ill post my progress of it all once im done!
Op, when/if you come back. Post some pic's.
99 750 is fuel injected.
Was under the understanding that would have three lines to the back of the tack. vent, drain, and fuel return line.
Without pic's I am guessing, but sounds like...... Fuel injected pump (<has no petcock) in a carb'd tank, and lending to confusion.... for me at least.
If i'm correct.... you can not use the fi pump. Way too much pressure for the carbs.
not to thread jack here, but i think i have a similar issue as the OP. i have a 00 600. obviously carbed but from the info here i might have a FI pump? can anyone explain the visual differences between the two pumps? Mine has one large diameter hose that should be the feed line. then a smaller line that i believe is the vent. then the tank itself has two (i think) lines off it as well.
I just bought an gsx-r 600 srad 1998 with carburetors. When I saw this video is checked it on my bike.
https://youtu.be/Eew4CIK9whM
The hose coming from the airfilter was half gone and the tube that should be connected was lying loose.
Since this part is not for sale anymore I cut the hose so the connecting tube just fits into it and taped it all up to make it airtide...
No difference in power as it should be according to the maker of the video. Since it wasn't driving terrible to begin with, could it be possible this system is not in use anymore on my bike?
In middle revs this bike misses the punch that my previous bike delivered and when you max throttle it and turn back a little it feels like it runs better with half throttle or at least as good.
How could I check if this system of vacuum fuel regelation is still in use or not and how to use it again if not?
I need max power ?
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