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Hi all,
As some of you may have seen In other posts I recently purchased an 05 carb. Rebuilt it with JD jet kit, new o rings, AP update kit, quickshot 2 and merge AP spring.

Per instructions I just threw the tank back on to check the timing on the AP squirt into the carb only to find no squirt at all.

I am done for the night and am going to work on this in the morning. Just wondering what is the most common cause of this issue?

I'm planning to just drop the AP cover assuming it has to be something in there or the diaphragm ?

Any and all help much appreciated.

Just took off ap cover. Awaiting suggestions and or test ideas?

when installing the AP update kit did you remove the check valve in the float bowl? if not, remove it. also, when you replaced the AP diaphragm was the original deteriorating? if so, you could have a piece of the rubber coating in the AP circuit obstructing/clogging it. if replaced make sure it was installed correctly. check also the AP plunger rod. make sure it is installed correctly and function. do the same with the AP cam. report back.

ken

crfsonly wrote:when installing the AP update kit did you remove the check valve in the float bowl? if not, remove it. also, when you replaced the AP diaphragm was the original deteriorating? if so, you could have a piece of the rubber coating in the AP circuit obstructing/clogging it. check also the AP plunger rod. make sure it is installed correctly and function. do the same with the AP cam. report back.

ken

Yes I did remove the check valve from the bowl. The original diaphragm was in decent condition and not deteriorating. When I rotate the throttle (with ap cover removed) I can visually confirm the plunger rod is functioning properly.

And it's not even a weak spray from the nozzle it's not coming out at all.

I have sprayed air through the jets in the bowl and they seem fine so it must be something above but I'm lost for ideas.

Where does the fuel that sprays from the ap nozzle come from. Maybe I can back track it to see what the deal is

have you done anything with the leakjet? was it removed by chance? did you use the new AP cover that came with the AP update kit? Did you correctly install the new updated AP diaphragm?

crfsonly wrote:have you done anything with the leakjet? was it removed by chance? did you use the new AP cover that came with the AP update kit? Did you correctly install the new updated AP diaphragm?

Yes leak jet was removed replaced with JD leak jet.
No I did not install cover that came with kit. I am using the cover off my 09 carb because I had a Quickshot 2.
I followed the how to on installing updated diaphragm

post a photo of the AP cover you are using.

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i would install the AP cover that came with the update kit and see if this resolves the issue. if not and the leak jet is in stalled correctly, the check valve is removed in the float bowl, the AP diaphragm and spring is installed correctly, plunger is correctly installed and functioning then you either have a problem drawing fuel into the AP from the float bowl or you have a clogged AP nozzle/circuit.

crfsonly wrote:i would install the AP cover that came with the update kit and see if this resolves the issue. if not and the leak jet is in stalled correctly, the check valve is removed in the float bowl, the AP diaphragm and spring is installed correctly, plunger is correctly installed and functioning then you either have a problem drawing fuel into the AP from the float bowl or you have a clogged AP nozzle/circuit.

If its a clogged ap nozzle/circuit what do you do. I am going to try the other cover but just planning for worst case scenario.

if you can't clear it with compressed air you'll have to remove the mid-body to clear it. doing this is not for the faint of heart or the unskilled.

crfsonly wrote:if you can't clear it with compressed air you'll have to remove the mid-body to clear it. doing this is not for the faint of heart or the unskilled.

Which jet would you send the air through

please try the updated AP cover first. it's not a jet but the AP circuit that leads to the AP nozzle. start at the nozzle and used compressed air. you can also try to used compressed air at the pump end. the AP circuit is the next to the check valve circuit.

I have to head into work now but I think I may have an idea.

Is it possible explanation that I installed the diaphragm upside down. Right now I believe I have the side of diaphraghm with extended ridge on the spring side. I'm going to double check Manuel when home to find out correct install position.