Idle mix stack up

Angus67 · 11-25-2017, 12:21 PM

So i cleaned out my pz27 carb on my 200gy, got it all back together, but when i put the idle mix scew back in, i only had the screw. So i put it in, 2 turns out
Now that it back on the motor and full of gas, a small drop forms on the mix screw. Most other carbs I’ve worked on has a small spring and rubber (?) washer.
I may have blown it into another dimension with 150psi of air.
Just to confirm. Its oring , spring, mix screw?
Could this also cause hunting idle? The rubber carb mount is pretty cracked up, so that is more likely the issue there.

Ariel Red Hunter · 11-25-2017, 01:34 PM

Quote:

Originally Posted by Angus67

So i cleaned out my pz27 carb on my 200gy, got it all back together, but when i put the idle mix scew back in, i only had the screw. So i put it in, 2 turns out
Now that it back on the motor and full of gas, a small drop forms on the mix screw. Most other carbs I’ve worked on has a small spring and rubber (?) washer.
I may have blown it into another dimension with 150psi of air.
Just to confirm. Its oring , spring, mix screw?
Could this also cause hunting idle? The rubber carb mount is pretty cracked up, so that is more likely the issue there.

First of all, subjecting the carb to 150 lbs of air pressure is not smart. Secondley, you will never get anything even remotley approaching decent, REPEATABLE results with vacuum leaks on the engine side of the carburetor. First thing to do is to replace that rubber carb mount....ARH

Angus67 · 11-25-2017, 03:33 PM

Thanks

Megadan · 11-25-2017, 03:58 PM

Quote:

Originally Posted by Angus67

Just to confirm. Its oring , spring, mix screw?
Could this also cause hunting idle? The rubber carb mount is pretty cracked up, so that is more likely the issue there.

Your order is correct, although usually there is a small metal washer between the O-ring and the spring to prevent the spring from catching and binding up the O-ring when you turn the screw.

I agree with fixing the carb insulator/boot/intake before any further trouble shooting. That said, yes a leaking idle mixture screw could potentially cause a running issue. More importantly, a safety issue lol.

Angus67 · 11-25-2017, 04:54 PM

thanks dan. I pulled a spring, o-ring and washer from a 1980 -84 Yamaha xs 650 carb and went right in. no drips.
this is not my first rodeo with carbs. I always blow them out with hi pressure air. maybe not 150, but im sure that other dimension dosnt exist either, and if it does, its full of socks that don't match.
Ill order a new boot.

humanbeing · 11-25-2017, 05:39 PM

The O-ring trick: http://www.motorfans.com.cn/forum.ph...authorid=75082

Angus67 · 11-25-2017, 06:45 PM

Wow. Had no idea. Now i know where to get new ones. Thank you human being

11-25-2017, 12:21 PM	#1
Angus67 Join Date: Oct 2017 Location: shelton, Washington Posts: 167	Idle mix stack up So i cleaned out my pz27 carb on my 200gy, got it all back together, but when i put the idle mix scew back in, i only had the screw. So i put it in, 2 turns out Now that it back on the motor and full of gas, a small drop forms on the mix screw. Most other carbs I’ve worked on has a small spring and rubber (?) washer. I may have blown it into another dimension with 150psi of air. Just to confirm. Its oring , spring, mix screw? Could this also cause hunting idle? The rubber carb mount is pretty cracked up, so that is more likely the issue there. __________________ 2006 roketa 200cc 1971 Yamaha xs650 2x 1980 xs650, 1 is a café, other is a chopper/brat 1972 Honda xl250 2x early 90's Honda rf600 parts bikes more mc junk laying around.
	0

11-25-2017, 03:33 PM	#3
Angus67 Join Date: Oct 2017 Location: shelton, Washington Posts: 167	Thanks __________________ 2006 roketa 200cc 1971 Yamaha xs650 2x 1980 xs650, 1 is a café, other is a chopper/brat 1972 Honda xl250 2x early 90's Honda rf600 parts bikes more mc junk laying around.
	0

11-25-2017, 04:54 PM	#5
Angus67 Join Date: Oct 2017 Location: shelton, Washington Posts: 167	thanks dan. I pulled a spring, o-ring and washer from a 1980 -84 Yamaha xs 650 carb and went right in. no drips. this is not my first rodeo with carbs. I always blow them out with hi pressure air. maybe not 150, but im sure that other dimension dosnt exist either, and if it does, its full of socks that don't match. Ill order a new boot. __________________ 2006 roketa 200cc 1971 Yamaha xs650 2x 1980 xs650, 1 is a café, other is a chopper/brat 1972 Honda xl250 2x early 90's Honda rf600 parts bikes more mc junk laying around.
	0

11-25-2017, 05:39 PM	#6
humanbeing Join Date: Mar 2008 Posts: 2,436	The O-ring trick: http://www.motorfans.com.cn/forum.ph...authorid=75082 __________________
	0

11-25-2017, 06:45 PM	#7
Angus67 Join Date: Oct 2017 Location: shelton, Washington Posts: 167	Wow. Had no idea. Now i know where to get new ones. Thank you human being __________________ 2006 roketa 200cc 1971 Yamaha xs650 2x 1980 xs650, 1 is a café, other is a chopper/brat 1972 Honda xl250 2x early 90's Honda rf600 parts bikes more mc junk laying around.
	0