600 Vent lines - Yamaha Grizzly ATV Forum
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post #1 of 5 Old 09-10-2013, 09:07 PM Thread Starter
 
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600 Vent lines

Hey, I picked up a 600 grizzly last week and im doing a bunch of work to it, getting it ready to snorkel etc. I need some info on carb vents/drains, never had one before and the previous owner just kind had stuff laying around so..

First off, there is a line coming off the bottom of the bowl that leads just infront of the rear swing arm. I am guessing its an overflow for the carb, its pretty much straight down do i need to plug it or not? Also for the actual drain for the bowl should there be a line off of that or no? looks like there should be but there isnt here.

Second is another bigger line higher up on the carb that points straight down, im guessing that is the vent for the carb? can i just run that up to the pod and loop it?

Third is the big line on the right side of the carb that goes to the intake boot, basically im wondering what this is for and what i can do with it when i snorkel the bike?

And the last is the crank case vent, i thought it was supposed to go to the air box on the clean side of the filter but i can't find where it goes, its just laying on top of my crank case with a small filter on it. I would like to run this into my air box, and loop it around my air filter if possible with a small filter on the end of it... what is everyone else doing with there crank case vents?

Any info is appreciated, heres pics of what im talking about..
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post #2 of 5 Old 09-10-2013, 10:34 PM
TrailWolf
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1. I would not just plug the float drain, use a one way valve or
only plug when going in deep with golf tee.
2.I would run the carb vent up on the snorkel.
3. I don't remember...lol
4.I ran both crank case vent inside the air box on both my ATV'S
5. Don't forget the diff vents, I ran them up to the pod and looped them

I hope that helps some....
 
post #3 of 5 Old 09-11-2013, 02:03 AM Thread Starter
 
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So the second pick is a carb vent line? im still confused why its just pointed straight down..

Diffs, drum brake in rear, and oil cooler fan are already ran to the pod and looped atleast twice.
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post #4 of 5 Old 09-12-2013, 04:02 PM Thread Starter
 
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Bump, if anyone knows this stuff please let me know so i can fix it and go riding!
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post #5 of 5 Old 09-13-2013, 03:43 PM
 
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A vent line of the side of any carb is to vent the float bowl. It stops pressure or vacuum build up to allow fuel to flow in and out without restriction.

Route it high. If it plugs the bike will run like poo

The hose that goes from the side of the carb to the intake boot is generally for the deceleration circuit. That needs to be there, other wise you'll get back firing on decel.

Make sure it doesn't leak.

The hose in the bottom of the bowl is the overflow/ drain.

(As stated above)

Put a one way valve on it with the flow arrow pointing away from the carb, or plug it when going deep. Unplug when not, if you ever have a leaking fuel pet cock or leave it on, and a sticky float valve, you'll fill the motor with gas.

2002-686
JBS + T4B
Snork'd
28" ML's
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