Posted by fzbuilder on June 18, 2008, 7:30 pm
Hey guys, I have a Yamaha FZ600 86 with 4 aftermarket air filters. The
air box, charcoal canister and control valve were all removed by the
preivous owner. I have 2 tubes coming out of the carbs (3 counting the
fuel line) that were hooked up to the crankcase breather very loosely
and bike ran like crap. I then put clamps on all that to make it air
tight and bike would not start. I figured out that the crankcase needs
some air or at least not to be hooked up to the carbs. I also have a
hose going from the second nipple (water seperator?) on the tank to
the intake boot of the #2 cylinder. What would be a good way to hook
all this up? Thanks!
Posted by . on June 18, 2008, 8:13 pm
> Hey guys, I have a Yamaha FZ600 86 with 4 aftermarket air filters. The
> air box, charcoal canister and control valve were all removed by the
> preivous owner. I have 2 tubes coming out of the carbs (3 counting the
> fuel line) that were hooked up to the crankcase breather very loosely
> and bike ran like crap.
Thw two small hoses coming from plastic T fittings are carburetor
vents. If you don't care about polluting the atmosphere with this
machine, just run them so they dump overboard.
> I then put clamps on all that to make it air tight and bike would not start.
> I figured out that the crankcase needs
> some air or at least not to be hooked up to the carbs.
The idle jets can't suck fuel out of the float bowls if they aren't
vented to the atmosphere or to a charcoal canister.
The crankcase vent itself will be a larger diameter hose. You could
put a K&N valve cover vent filter in that hose.
> I also have a
> hose going from the second nipple (water seperator?) on the tank to
> the intake boot of the #2 cylinder. What would be a good way to hook
> all this up?
If it really is the water separator, you can just run that hose to
dump overboard.
But, if that tube actually goes to the area underneath the gas cap,
you need a anti-backfire check valve in the hose to prevent backfires
from igniting vapors in the fuel tank.
To find out if the hose hooks up to the aforementioned area, blow air
through it with the gas cap off and see if you hear it whistling out
the hole.
I got into big trouble when I removed the charcoal canister from by
GSXR. I didn't
know what to do with the evaporative control hose and the water
separator, so I just connected the two outlets with a loop of tubing.
Bad move. Water accumulating in the gas tank caused rust, and I had
pin hole leaks in the bottom of the gas tank after two or three
years...
Posted by fzbuilder on June 18, 2008, 10:08 pm
> > Hey guys, I have a Yamaha FZ600 86 with 4 aftermarket air filters. The
> > air box, charcoal canister and control valve were all removed by the
> > preivous owner. I have 2 tubes coming out of the carbs (3 counting the
> > fuel line) that were hooked up to the crankcase breather very loosely
> > and bike ran like crap.
> Thw two small hoses coming from plastic T fittings are carburetor
> vents. If you don't care about polluting the atmosphere with this
> machine, just run them so they dump overboard.
> > I then put clamps on all that to make it air tight and bike would not start.
> > I Â figured out that the crankcase needs
> > some air or at least not to be hooked up to the carbs.
> The idle jets can't suck fuel out of the float bowls if they aren't
> vented to the atmosphere or to a charcoal canister.
> The crankcase vent itself will be a larger diameter hose. You could
> put a K&N valve cover vent filter in that hose.
> > I also have a
> > hose going from the second nipple (water seperator?) on the tank to
> > the intake boot of the #2 cylinder. What would be a good way to hook
> > all this up?
> If it really is the water separator, you can just run that hose to
> dump overboard.
> But, if that tube actually goes to the area underneath the gas cap,
> you need a anti-backfire check valve in the hose to prevent backfires
> from igniting vapors in the fuel tank.
> To find out if the hose hooks up to the aforementioned area, blow air
> through it with the gas cap off and see if you hear it whistling out
> the hole.
> I got into big trouble when I removed the charcoal canister from by
> GSXR. I didn't
> know what to do with the evaporative control hose and the water
> separator, so I just connected the two outlets with a loop of tubing.
> Bad move. Water accumulating in the gas tank caused rust, and I had
> pin hole leaks in the bottom of the gas tank after two or three
> years...
Thanks for the info...the hose coming from the fuel tank is air tight
( no whistle comes out with the gas cap off) so I just blocked off the
nipple on the intake boot and ran hose from the tank to the ground.
Also put a crankcase filter on and now the bike is running great.
Thanks again!!!!!
Posted by . on June 19, 2008, 12:04 am
> Thanks for the info...the hose coming from the fuel tank is air tight
> ( no whistle comes out with the gas cap off) so I just blocked off the
> nipple on the intake boot and ran hose from the tank to the ground.
> Also put a crankcase filter on and now the bike is running great.
Have you taken the bike for a high speed ride yet?
If you start having fuel starvation at high speed, it may be because a
California spec gas cap probably isn't vented, but the gas cap for
other markets in the USA is vented.
Posted by . on June 18, 2008, 8:15 pm
> Where is Krusty when someone needs him?
Krusty is *always* there to help the brothers fix their busted bikes.
That's what the brotherhood of all bikers is about.
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> air box, charcoal canister and control valve were all removed by the
> preivous owner. I have 2 tubes coming out of the carbs (3 counting the
> fuel line) that were hooked up to the crankcase breather very loosely
> and bike ran like crap.