FCR questions please help me before insanity sets in

[svr]

howdy all, i just pulled my fcr 39s off of my m900 for a good scrubbing and blowing out of the passageways.  i had a sticking high idle and suspected sync was needed.  didn't look bad, but figured i should go ahead and clean them up while they were off.

threw them back on the bike tonight and damn near killed the battery trying to get her to crank.  if f twisted throttle several times, i could get it to fire, but would die very quickly.  stock fuel pump and petcock (which i'm about to rebuild and replace) so i was wondering if maybe they need to be "primed" by filling the float bowls or something so it'll run and build up vacuum and get the pump going.  Is this just a ridiculous thought and there is obviously something else wrong?  Just seems like it doesn't have enough fuel to maintain running.

are there any general difficulties in starting!  after a carb rebuild?  i remember after a rebuild of an old CV carb on my old zuk 650 i had similar problems and it had a vacuum petcock too.  can't remember, but i think a bunch of starter fluid straight to the intake finally got it going.

thanks for any help!  now i need a  .

steven

[svr]

Any takers?  Feel free to speculate...

[ducpainter]

Any takers?  Feel free to speculate...

It's possible the pump hadn't filled the bowls, or the petcock stuck.

The petcocks usually fail by dumping fuel into the horizontal manifold.

[Speeddog]

I've had good success starting bikes using the method you described; starting fluid sprayed in as you crank the engine.
Contact cleaner works too.

Of course, if the engine backfires, it may be a bit exciting.

Safer method is only spray when the engine isn't turning.

[ducpainter]

I've had good success starting bikes using the method you described; starting fluid sprayed in as you crank the engine.
Contact cleaner works too.

Of course, if the engine backfires, it may be a bit exciting.

Safer method is only spray when the engine isn't turning.

I like the cranking method better.

Ether can lock up a motor too easy.

[Speeddog]

I was assuming that he wouldn't go overboard on the spraying. 

But we are dispensing advice on the internet, so anything could happen.
<No disrespect intended to the OP>

[ducpainter]

I was assuming that he wouldn't go overboard on the spraying. 

But we are dispensing advice on the internet, so anything could happen.
<No disrespect intended to the OP>

Yeah...

it seems the OP has the process down.

Ether is hard on rings no matter how you use it, but worse if you static spray IMO.

[Howie]

I etherized a lawnmower once, it was not pretty.

[ducpainter]

I etherized a lawnmower once, it was not pretty.

That poor Briggs/Tecumseh didn't stand a chance...

[svr]

Thanks for the tips eveybody. I dd Luke u guys suggested an filled each cylinder with ether, and fired her up. Is it ok for 30 ft blueflames to shoot out the exhaust and air cleaners?  Kidding. I think IM onto what's up but illwait til IM sure to expose my idiocy.

[greenmonster]

Loosen fuel line at bowls and crank a few secs.
Does it fump freely? If so, pump & petcock probably OK.
Plugs don`t get wet?

[svr]

Well, i haven't solved this issue.  Here's what I've done:
Cleaned carb multiple times, adjusted sync.
Replaced vacuum petcock with manual valve.
Installed an adjustable mixture pilot thumbscrew for easy adjustments.
Carb has the adjustable slow air jet.  I've got it at 1 turn out right now.
Carb is getting fuel to float bowl and the accelerator pumps are working.
I've rebuilt the vac fuel pump and I've also tried bypassing it as well and doing a gravity feed.

Replaced all fuel lines and vacuum lines.

All this and it will fire up if i dump several squirts of fuel via accel pump before cranking.  It will run for a few seconds then die.  Won't start again until I twist throttle several times and dump more fuel in.  I can continue this ad infinitum or until the battery finally dies.
It almost seems as if the carb will not pull fuel from the float bowl since its starting with excess fuel dumped to the cylinders.  Is there any condition that would cause this?  If you can help, i will 

[greenmonster]

When it dies, plugs are dry?

Where did you buy the FCR`s, do you know your jettings?
If so, please share.

You sure of no tank vent problemos?

[svr]

pretty sure its not a vent issue.  same deal with the gas cap open.  i also blew air through the vent and overflow tubes and they appear clear.

the carbs came on the bike when i bought it.  i'll try to recall all the jetting and once i pull the carbs again, i'll update this.  i know the pilot is a 60 and i think 155 main.  can't recall the main air size so once i pull them again i'll derby.

as far as plug condition, i'm dumping so much fuel in that they are wet to my recollection, but i need to go start it and then pull them immediately to be sure.  i know they have come out wet previously, but can't recall if i had pulled the throttle before that so i'll get back to you on that.

any chance this could be an ignition/coil or related problem?

[greenmonster]

You do have good spark on both?