carb installation Help Me Please!!!

If you have any questions regarding that fuel pump circuit, airgreasemonkey...post 'em. I'm quite familiar with how that circuit works.

 

thanks dizzy, i did have one question, i know that the starter button triggers the pump relay initially, but what keeps the pump going once the bike is started?

 

It's not the starter button that triggers it...It's your ignition system. The wire in question is either blue or yellow (I don't remember which, I think blue though) in the connector to the relay. It's wired directly to and recieves a signal from one of the ignition coils. So your bike won't pump fuel 'til it's producing spark.

If it's as I recall...your bike has two ignition units also. One ignition unit controls the coil to the front cylinders...the other ignition unit the rear bank coil. One ignition unit (I'd need a diagram to tell you which) sends a signal to the fuel pump...the other to the tachometer.

If you're still with me...here's the interesting part. An ignition system failure could (and based on my personal experience, often did) cause the bike to run out of gas...or make your tach read erratically, depending on which separate ignition circuit failed. So...in a situation like yours where the fuel pump relay is in question...you always wanna check for spark, and continuity from the ignition system to the fuel pump relay on that blue (or yellow) wire.

 

ok that makes sense, im still with you on the last paragraph, now i did verify that the relay is bad from how my manual told me to test it, the white wire to ground should have no continuity to ground when the key is on and when you hit the starter button you should get 12 volts difference btw that same wire and ground meaning there is voltage running through that part of the circuit, on my bike it failed both tests in that there was continuity to ground in the first test and the second test revealed that there was no voltage running through that wire when i pressed the starter button in, today i also found that when the key was on that both the black and blue wire did have voltage going through them, should i have voltage coming off of the coil terminal when the bike isnt running? also when i crank the engine with the starter the tach does jump around a little sometimes peaking at a couple thousand rpm, any thoughts?

 

oh and i just checked today and im not getting a spark off the coil with the blue wire that runs to the relay, i even plugged one of the wires i know works into it and still no spark...

 

Hmm...I was never able to read the signal to the fuel pump relay from the coil reliably. Perhaps you could with a "peak" type voltmeter, but at the time I didn't have one. Are you telling me you have no spark? Let's start at "square one"...do you have spark to both front and rear cylinder banks?

 

ok i spoke too soon about not having a spark, turns out when i unplug the fuel pump relay i loose the spark off of the front bank / the coil that is connected to the relay, after i figured that out last night i got my bike running on the remaining fuel in the carbs so it died after a couple seconds

 

There's nothing about unplugging the fuel pump relay that should cause you to lose spark. Matter of fact, if you unplug the relay connector...short the black and white wires with a paper clip, it should activate your pump (suppose you could say you're "hotwiring" it). I've done this before often to troubleshoot the pump circuit.

 

ya i knew about that, hopefully when i get back from detroit tomorrow ill be able to fire the beast up, the relay came friday after i had left for the weekend

 

its alive!!! to bad i dropped my wallet on the highway this morning

 

Absolute MUST!!!

Carb separation Pages 4-8 Honda workshop manual.
Carb assembly Pages 4-9 Honda workshop manual.

You will not break the plastic fuel tubes if you do it the way the Honda manual shows.
You HAVE TO HAVE THE WORKSHOP manual for this level of repair!!!!!

By the Way.....They should have NEVER made fuel tubes with plastic!!!! PERIOD.

JUST Like when Kawasaki had some genius make the oil pump gear on the 1500 early pre2000 V twins, out of PLASTIC!!! It cost many engines and thousands of dollars.

They need motorcycle people in the motorcycle dept. NOT plastic toy designers!!

 

But my answer is good for a lifetime!

 

too bad your answer was 2 years too late...

 

Lol . . . .

 

lol. So hows the bike been running?

 

pretty good, its been a while since ive been on the forum but im actually riding a kawasaki ninja zx-7r now days, but my brother is riding the old interceptor... i flew home last week to visit and stole it back from him for a little bit and it was running like shit so i had to go through the carbs again and now she is running alot better

 

Did your brother say thanks?

 

yes he did, and he wants to buy it off of me. id consider selling it to him and he has taken good care of it other than being mechanically illiterate but he doesnt work that much so i dont think he will be able to come up with the money