This oring, if it oes between the carb and motor, it needs to be there.
It should start w/o the filter.
Try using 2 fingers and hand choking it.

 

The old o ring is there and looks free of defects.

It's definitely fuel delivery as it runs on starting fluid. I will attempt to manual choke and see. The jets are clear so I'm not sure why it wouldn't pull fuel. Also I had no starting issues cold or warm.

Thanks

 

You were spot on, hand choked it and it started up. It didn't run very well without the air cleaner. Put the air cleaner on and it ran differently but equally bad.

So now my problem is I can start it but it won't idle, it wont respond to the choke lever, and it wont respond very well to a change in throttle. I'm wondering if the throttle linkage isn't correct. Should the entire or most of the air way be blocked when the throttle is closed? From working with automotive carbs, most of the time there is an idle circuit, and the pathways remain closed. When I look into the carb, it is halfway un ubstructed.

 

Ok, I feel like an idiot. I didn't have the idle speed screw set. When I rebuilt the carb I just screwed it in. So I adjusted it and the idle is fine.

I took it out around the yard and it runs much better. I do notice however I can increase the throttle little by little and the quads speed and rpm will increase, then at a certain point, and I don't know how to identify this point, but the engine stumble and loose all steam.

I realize that perhaps the throttle linkage needs to be adjusted, but I was curious why this is happening. It's almost as if I cannot achieve full throttle.

Thanks for everyone's help. I look forward to responses.

 

I'm so frustrated with this thing.

At wide open throttle and keep it there the motor dies. If I go to wide open throttle and it starts to die but I let off the gas it will recover.

This is happening not only with abrupt changes in throttle position but also gradual.

 

Almost sounds like it needs a larger main jet.
Have you checked the valve adjustment yet?

 

The kit contained all the jets for the rebuild. I'm tempted to put the old jets back in. The only part that needed replaced was the needle valve. It didn't do this before all the problems started.

If I choked it wouldn't the same effect be accomplished? Right now if I apply any choke it wants to stumble and die.

What valve adjustment are you speaking of? I can try to locate it in the service manual.

Thanks

 

The LTZ ios a 4 stroke, so there are valves. I'm presuming that there is a adjustment and appropriate settings.
.004 if I remeber correct on most 4 strokes..

 

Straight from the carburetor section service manual.

Medium or High speed trouble

• Clogged main jet
• clogged needle jet
• improperly working piston valve
• clogged fuel filter

I just went thru the carb. So I'm inclined to say it isn't a clogged jet. Since I was getting fuel into the carb upon my inspections I don't think the fuel filter is to blame. The piston valve has me curious. The manual says to adjust but I cannot find a procedure. The pistion valve is connected to the throttle cable and is inserted into the top of the carb.


From the engine portion of the service manaul


Engine runs poorly in high speed range

• weakened valve springs
• worn camshaft
• valve timing out of adjustment
• too narrow spark plug gap
• ignition not advanced due to poorly working timing advance circuit
• Defective CDI unit
• Defective ignition coil
• low float chamber fuel level
• clogged fuel hose, resulting in inadequate fuel supply to carburetor
• clogged air cleaner element
• sucking air from carburetor joint

I don't notice any excessive engine noise, so I don't suspect and and motor issues. I am suspicious of the "sucking air from carburetor joint" I did not replace the o-ring between the carb and intake tube. The manual says to replace this.


Anyone know how to adjust piston valve?

 

Might have discovered something.

I tightened the carb mounting bolts and tried to start. normally it starts easy. I pulled the rope and it tried to start. So I thought why not. I'll choke it. No luck starting with choke. Take choke off and it starts. While it is idling applying any choke with the lever kills the motor.