i have a 03 grizzly 660 and been in iraq and the gas has set in the tank for over a year, so i drained the tank and pulled the carb and cleaned everthing and put it back together and it runs fine but fuel comes out the fuel drain plug all the time,is there a o'ring or something that stops this problem.

 

Vacuum slide type carb, yes. We made sure that the diaphragm is in good condition, no holes. I had a seasoned mech. check it over & I am sure he reassembled it properly.

JTUBBS - If fuel is running out from that fitting on the bottom of the bowl, it sounds like the float is stuck. Gently tap on the fuel bowl a couple times w/ a screwdriver handle, see if that stops it.

 

Boy, this is sure something;

I went over the entire quad yesterday, checked/rechecked every fitting, hose connection, all looked good. I also disconnected, inspected, cleaned every electrical connection, even pulled all the fuses & tested them.

Nothing has been overlooked. This quad is being a real "bear", no pun intended.

Sure wish I could get this thing running right on my own, but it looks like that will not be the case.

If anyone has any ideas/suggestions at all, let me know. Otherwise, I guess I will have to admit defeat & send it to the quad garage, which I really hesitate to do...I can feel my wallet getting lighter...

 

Can you throttle it up with the choke on? And if so can you keep it throttled up without the choke?

Also might be silly, but check your spark plug connection, and make sure theres no oil or moisture where the plug wire is close to the frame.

 

It will only throttle to 1/8, maybe 1/4 throttle max before it starts to sputter. It is not the reverse limiter, I know what that sounds like. This is sputtering as in running out of fuel, yet the bowl is full every time we disassemble it.

Spark plug is new. Wire is in good shape, but I will double check all that. This quad have very low use/run time on it. It is mainly used for pulling a wood trailer, plowing snow, garden work in the summer, stuff like that

 

4 stokes use CV type carb not the Slide carb.

On a CV carb the throttle cable is connected to a butterfly valve that varies the volume through the venturi. It's not the throttle, it's the pressure difference from the venturi to the outside atmosphere that moves the slide.

Its vital that there is no air leak between motor and carb and air box and carb. Here is good info about the operation of a CV carb.Care & Feeding Of The Keihin Carb

 

well it sounds to me like it is definitely leaning out...did u guys remove the bowl floats????if so u probably inadvertently changed the fuel float level.there is only one way to fix that.fairly simple, but u need to find out want the stock measurement is(online or in your models shop manual)all u have to do is attach a new piece of fuel line to the bowl drain port on the bottom of the bowl.open the drain screw, grasp this line and rap it up towards the sky. in the manual it will tell u where in relation to a specific spot on the carb to set a zero mark.from hear it should give you a specific measurement on what the level should be.ex...on a blaster it is aprox 1.750 inches.to adjust simply, slightly bend the metal arms on the float untill u have reached

 

The spark plug which is new, is black & sooty when I remove it. To me, that doesn't indicate a lean problem. Is there any type of electronic engine control/sensors on this quad at all, other than the reverse limiter?

There is a black box about 1/2" thick, 3" x 4" square - next to the battery connectors, in the area of the fuses - what is that box? Just wondering.

I spent over 2 hrs. on this thing today, adjusting the carb all over the place, checking connections, everything. I am completely stumped. Looks like the quad shop will have a Merry Christmas courtesy of my wallet.

I estimate $300 - $400.....

Did I mention I hate this quad the blasted thing has never run right since new...

 

I know this is an old thread but for everyone else that might read it, I did the samething. I took a friends quad (660 grizzly) to fix it (stuck needle valve). Took care of that problem. Put it all back together and it fired up like a champ, but as soon as you gave it gas backfire and die out. Found out the float was out of adjustment and I was starving the main jet for fuel.

 

The float is not adjustable, is it? Mine has a plastic tang area that the needle attachment wire goes over, & noting there can be bent/adjusted that I can see.