fuel leak and not running well FJ1200

[davidpot53]

hi !

Since yesturday i try to get that old lady back on the road, i striped the carburetors to clean and check, one of the jets was loose on the bottom 

after that, put all back together and again fuel leak from the overflow on carb 4 but only sometimes, #3 and #4 get backfire through the carb and i have a big question ! 

On the carbs, we have 4 pipes for the overflow
One pipe coming from the fuel pump to a rail for all the carbs
AND ! between carb 1 and 2 i have a bigger pipe coming off and an other one between 3 and 4, thoose big pipes, where they go because one of them was plugged to the air box so where go the other one ? or a junction between them is missing ?

i need your help for thoose pipes, i need to know if i have everything in place before i start the setup

thank you all 

[davidpot53]

hi 

does someone would have a picture of the carburetors without the air box to help me on my mission 

[Harvy]

Hi David, welcome to our club house.

What year FJ1200 mate?........ and is it a US model or a European OEM?....... it makes a difference as to how all the piping goes together.

GO here:

http://www.boats.net/parts/search/Yamaha/Motorcycle/parts.html

and select your year, then drill down to the model and finally select CARBURETOR to see a part diagram.
HTH.


Cheers
Harvy

[davidpot53]

hi harvy !

i looked on your link but i can't really see where they go 


here the pictures of what i mean :



pipe 1 and 2 are the problem !

when i took the airbox out and the fuel tank, pipe 2 was fitted to " ?? " showed on the picture but pipe 1 wasn't fitted 

i have done a junction between them so now they are fitted both to the air box, don't know if i am right but this is the only way i thought

[SlowOldGuy]

is a drain for the airbox.  A hose should attach to that port and allow any condensation, excess fuel or oil to drain to teh ground. 

Pipes 1 and 2 are carb float bowl breather/overflow hoses.  These hoses should NOT be attached to the airbox.  They should be routed around the right side of the heat shield and into a loop on the back side of the engine case.

Pipe 3 is correct, it's the crankcase breather hose that vents into the airbox.

DavidR.