Quietline 1200 Carb Issues
 

My carb been giving fits lately. I tried adjusting and retried adjusting.
Finally found spring to governor was broken. Then found the throttle rod will come up and out of the carb about a 1/4"

I can buy another spring, if I recall, about $12. How do I get the rod to stay in the carb and not move up? Please don't tell me the plate came lose and it and the screws got sucked into the intake!

Thanks for your replies, I have 3 Quietlines, all work for a living and you guys always have the answers for me!

Take the air cleaner off and see what's going on in there.
My X=ray vision is on the blink today.

If the throttle shaft moves up/down in the carb at least one of the screws got injested. :bigeyes: If it comes all the way up and out, ya swallered both of them. Please investigate as ya'll don wanna ruint yer 'injin with extreme rpm's. :biggrin2:

I had the air cleaner off and that is when i discovered the throttle shaft moving up and down, could not see it behind the air cleaner back plate.

I am going to take the carb off this afternoon and we'll find the problem.
Maybe new screws and throttle plate will fix. Or maybe a new carb. I will be eager to hear your opinions.

Thanks for the replies!

look in past the choke plate at the throttle plate . you will be able to see it better with the carb off though

I pulled the carb. The throttle plate had come off the rod and was jambed into the intake but I was able to get it lose and out. One brass screw was missing and I presume went into the engine. I am glad its brass. The other screw head was missing but the shaft of the screw was still in the throttle rod. I will be able to back whats left the the screw out with forceps. The throttle plate is wore a little on the opposing edges perhaps when the one screw came out and allowed the plate to rub inside the throat of the carb but that is not too serious.

So, where do I get 2 of those little brass screws?
Should I try to get a throttle plate while I am in there?

Thanks, guys!

You need to STAKE those screws so they CAN"T come out.

Have you had this carb apart before?

Maybe someone else (PO comes to mind) had and tried to unscrew the screws WITHOUT filing the staked ends off and broke one and maybe compromised the strength of the other enough to cause it to break once they got it running again and after they were done screwing with it.

Whatever you do it will have to come apart now.
The screws are a #4 brass,
A "Hilman" assortment at Ace hardware should have those.

Hope you can get the broken one out

I never had this carb apart before. I got whats left of the brass screw out.
A quick run to my Ace Hwd and maybe they got brass screws for me.

I will lightly hammer the throttle plate back into shape.

A trip to my dealer for a governor spring. Assemble all and I am back to mowing.

You guys always help me out!

Good deal!!

I usually gall the exposed end of that screw up with a vice grips and use thread locker to boot.

I'm curious about the history of the machine. Have you ever had the head off to decarbon? If not and you think there's a screw in the engine maybe it's time to pull the head? :bigthink:

https://www.onlycubcadets.net/forum/...339#post337339

:IH Trusted Hand:
2 skools of thought:
Pull the head and view the witness marks of the screw indentations in the piston & head, possibly the screw is still stuck in one of them, I've seen it.
Other thought:
leave well enough alone, what is done is done.
Your engine your choice.
Me, I'm curious George:biggrin2:

You need to STAKE those screws so they CAN"T come out.

Have you had this carb apart before?

Maybe someone else (PO comes to mind) had and tried to unscrew the screws WITHOUT filing the staked ends off and broke one and maybe compromised the strength of the other enough to cause it to break once they got it running again and after they were done screwing with it.

Can you please explain the process of STAKING the screws. Thank you

Ken

Look at the back of the throttle plate (if you can) and you will see that the exposed end of the screw appear to have been spread by some sort of tool and will look like a chisel mark smack dab on the end of the screw.

Probably a special compression tool of some sort used during assembly.

That's why one needs to file off the exposed threads before attempting to extract the screw in a normal manner when removing the throttle shaft for bushing installation to repair a worn carb body.

I wont be pulling the head. Brass is pretty soft and the engine was running well. But my problem now is finding the right brass screws. I need a source, my Ace Hardware had them down to #4 but that was TOO big in diameter and was of a more course thread pitch. I tried to get it to thread but just broke off the head.

Any suggestions on where to buy those 2 screws?

Thanks!

I don't think I would pay this price and it's probably not what you need, but a google search for "throttle plate screws" got me to this. I'm sure you can search for yourself and do betterer....

https://www.ereplacementparts.com/sc...iABEgL6o_D_BwE