wont stay running

[mike7498]

I have a 1981 gs650 that I am turning into a bobber, first things first though it has to run good, so Ive looked at diagrams, and checked the fuel lines, cleaned the floats. it has two fuel lines(correct any of this if Im wrong please)the small line goes to the top of the carb, and the big one feeds the carbs...next there are 3 different nipples, 1 between carb 1&2 one between 2&3 and 1 between 3&4, so is the middle one a drain tube? and do I need to T off the main fuel line to the other two?? I can get it to run when I hool it up to the outside nipples but wont idle...help please.......

[chuck hahn]

MIKE...between carb 2 and 3 (counting from left to right as you are sitting in the bike ) There are TWO nipples..The small one goes from there to the small one on the fuel petcock. The BIGGER one goes to the larger fuel outlet on the petcock. The other small, ones on the far left and the far right, are carb vents. You run a piece of vacuum line from these down between the tranny case and the swingarm and let them dangle there..DO NOT PLUG THEM WITH ANYTHING... simply stuff them down there and let them VENT the carbs

[chuck hahn]

PS... Once you get them hooked up in the right order set the petcock to the PRI position and wait about a minute. This PRIMES the carbs so there is gas in all the bowls. You can then put the petcock to the ON position, choke the bike , and start it .

[BassCliff]

Greetings and Salutations!!

Hi Mr. mike7498,

You'll want to see the Where Do These Hoses Go? article on my website. Now let me say "Hi"!

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BassCliff

[mike7498]

so I hooked them up in the right order and now it wont fire without the help of a little starter fluid, not sure if this matters but Im running pods and just head pipes right now, maybe jetting or air mixture?? just seems wierd that it will start of the fuel drain nipple but not the actual inlet

[fenderfreek]

First thing - put away the starter fluid. You'll do nothing but burn up your top end and pistons.

Your problem is exactly what you said it was yourself - you're running straight pipes(no backpressure) with pod filters and either one of those things by itself is enough to royally screw up the air/fuel mixture.. If you want to run non-stock filter and exhaust arrangements you *must* rejet and retune the carbs. There is absolutely no way for it to run properly with those modifications unless you do.