Sheng Wey PD1? - Page 2

Wild_Alaskan · 01-18-2010, 10:56 PM

try raising the needle a notch or two for the off idle bog, that's usually caused by leaning out when snapping the throttle. (that's why most jap bikes have accelerator circuits)

recracer · 01-18-2010, 11:15 PM

This past weekend i went out for one tuning ride . 105 main jet ,needle 2nd down from the top . report really strong , i didn't have the gps with me ,but i believe i easily past 70 mph on the flat and fell back to 70 uphills . however plug reading was lean , bone white, lean is mean , but scary on an air cooled engine . moved the needle to the bottom . stuck waiting for a nice day off to test again .

Wild_Alaskan · 01-19-2010, 12:24 AM

you may want to bump up the main jet to a 110

think · 01-27-2010, 05:04 PM

Hey everybody. I'm a noob, not only to the site but also to owning a Chinese 200gy as well. I bought a used 2005 dual sport recently and I too had issues with my stock sheng wey PD11 carb. So I bought a 30mm Mikuni carb off of ebay and I don't know much of anything about tuning carbs. My main question is about whether or not the jets need to be purchased separately from the carb. It came with Jetish looking screws in the jet holes, but one is silver in color rather than the brass color I'm used to seeing. Are these indeed jets? and if not what size jets do I need, where's a good place to get them, how do I dial them in corectly, etc.? Any help here would be greatly appreciated. I want to get this bike to start on the first try without using the choke the like OP did. I would just be smitten by that! Thanks

Are there just 2 jets? The (i'm guessing) pilot jet on the bottom and the main jet on the right side? If so I mainly want to have the pilot jet set correctly before I bolt it on because I fear that I'll have to take the entire carb off again to be able to reach it with a screwdriver. Please help me get an idea of how to set this thing up. I can't wait to get out riding!
P.S. I also have a clamp on aftermarket air filter instead of the air box. This was a big inprovement even with the old sheng wey.

katoranger · 01-27-2010, 06:22 PM

Usually jets are included, but it may be that what is in there won't be the correct size for you application. Depending on the exhaust and elevation you may need a larger/smaller jet.

Allen

think · 01-27-2010, 08:08 PM

Thanks man. I'm slowly figuring all this out. I do believe that they are jets. Now it's just a matter of dialing them in. Is the air/fuel screw at the bottom (one closest to the intake pipe) of the Mikuni. and if so does "2 and 1/8 turns out" mean that I screw it in all the way and then back it out 2 and 1/8 turns or the other way around? also if it helps I'm about 400 ft above sea level here.

Weldangrind · 01-27-2010, 08:28 PM

Hi think, welcome! Please take a moment to post in the Introduce Yourself section.

Yes, you're correct on the air / fuel screw procedure. Please start a new thread on your bike and include photos of the underside of the carb if you can. That'll allow us to see the jet configuration.

Cheers!

waynev · 01-27-2010, 09:18 PM

Hey think, if that's one of the standard mikuni type carbs then for tuning you will have a pilot jet, main jet, needle jet, jet needle and the slide valve, if you want to get more familiar with what each controls then have a quick read of this page http://www.iwt.com.au/mikunicarb.htm

On the outside of the carb you will be adjusting the air/fuel screw and that silver colored one is probably your idle screw, your pilot and main jet are accesed by removing the fuel bowl off the bottom of the carb.

think · 01-27-2010, 10:48 PM

Right on! Thanks a bunch Wayne. That link was extremely helpful

I was unaware that the two jets were located inside the fuel bowl, but now things are becoming more clear. I took apart my old carb to familiarize myself with everything and I see now why my bike was running so badly at higher speeds. I'm surprised it ran at all! You wouldn't believe the amount of gook and calcium deposits in my old Sheng Wey carb. The holes in the jets were all but completely blocked. I cleaned most of it out already or I would have taken a pic of it to show you guys. It looked like hell. I plan on getting a fuel filter to put on my fuel line before I even test the new carb. I'll work on getting some pics up and starting a new thread. Thanks to all who replied. It is much appreciated.

Kivi · 08-25-2018, 04:53 PM

Hi, I have Sheng Wey PD1 carb and was wondering about the correct float level. Bike was running OK at first, but now it has some rich condition, high consumption, spark plug is totaly black. Anyone know the correct float level for this PD1 carb?

david3921 · 08-25-2018, 05:51 PM

I've heeded Weldangrind's suggestion on this with success. Turn the carb upside down with the bowl off. Position it so that the bottom (now up) is level. Bend the tab on the float until the seam on the float is parallel with the carb. This only works if there IS a seam on the float. Most are made with plastic floats that have a seam. If no seam, either draw or imagine a line across the center of the float. Then level to the carb bottom.

Kivi · 08-27-2018, 06:57 AM

I did it this way, thanks!
EDIT: And that is 14mm.

01-18-2010, 10:56 PM	#16
Wild_Alaskan Join Date: Dec 2009 Location: Alaska Posts: 914	try raising the needle a notch or two for the off idle bog, that's usually caused by leaning out when snapping the throttle. (that's why most jap bikes have accelerator circuits) __________________ Dune buggy build http://chinariders.net/modules.php?n...wtopic&t=14470 400cc lifan build vid: http://youtu.be/20HoU8OK_Y0 other fun: http://tinyurl.com/wildalaskan
	0

01-19-2010, 12:24 AM	#18
Wild_Alaskan Join Date: Dec 2009 Location: Alaska Posts: 914	you may want to bump up the main jet to a 110 __________________ Dune buggy build http://chinariders.net/modules.php?n...wtopic&t=14470 400cc lifan build vid: http://youtu.be/20HoU8OK_Y0 other fun: http://tinyurl.com/wildalaskan
	0

01-27-2010, 06:22 PM	#20
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	Usually jets are included, but it may be that what is in there won't be the correct size for you application. Depending on the exhaust and elevation you may need a larger/smaller jet. Allen __________________ You meet the nicest people on a Honda Clone.
	0

01-27-2010, 08:28 PM	#22
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Hi think, welcome! Please take a moment to post in the Introduce Yourself section. Yes, you're correct on the air / fuel screw procedure. Please start a new thread on your bike and include photos of the underside of the carb if you can. That'll allow us to see the jet configuration. Cheers! __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

08-25-2018, 05:51 PM	#26
david3921 Join Date: Feb 2009 Location: Michigan Posts: 1,035	I've heeded Weldangrind's suggestion on this with success. Turn the carb upside down with the bowl off. Position it so that the bottom (now up) is level. Bend the tab on the float until the seam on the float is parallel with the carb. This only works if there IS a seam on the float. Most are made with plastic floats that have a seam. If no seam, either draw or imagine a line across the center of the float. Then level to the carb bottom. __________________ 2012 Kawasaki Versys 1984 Honda Magna V65 2016 Rhino 250 2016 Tao Tao 125D
	2

01-18-2010, 11:15 PM	#17
recracer Join Date: Jul 2009 Location: Charles Town W.V. Posts: 849	This past weekend i went out for one tuning ride . 105 main jet ,needle 2nd down from the top . report really strong , i didn't have the gps with me ,but i believe i easily past 70 mph on the flat and fell back to 70 uphills . however plug reading was lean , bone white, lean is mean , but scary on an air cooled engine . moved the needle to the bottom . stuck waiting for a nice day off to test again .
	0

01-27-2010, 05:04 PM	#19
think Join Date: Jan 2010 Posts: 31	Hey everybody. I'm a noob, not only to the site but also to owning a Chinese 200gy as well. I bought a used 2005 dual sport recently and I too had issues with my stock sheng wey PD11 carb. So I bought a 30mm Mikuni carb off of ebay and I don't know much of anything about tuning carbs. My main question is about whether or not the jets need to be purchased separately from the carb. It came with Jetish looking screws in the jet holes, but one is silver in color rather than the brass color I'm used to seeing. Are these indeed jets? and if not what size jets do I need, where's a good place to get them, how do I dial them in corectly, etc.? Any help here would be greatly appreciated. I want to get this bike to start on the first try without using the choke the like OP did. I would just be smitten by that! Thanks Are there just 2 jets? The (i'm guessing) pilot jet on the bottom and the main jet on the right side? If so I mainly want to have the pilot jet set correctly before I bolt it on because I fear that I'll have to take the entire carb off again to be able to reach it with a screwdriver. Please help me get an idea of how to set this thing up. I can't wait to get out riding! P.S. I also have a clamp on aftermarket air filter instead of the air box. This was a big inprovement even with the old sheng wey.
	0

01-27-2010, 08:08 PM	#21
think Join Date: Jan 2010 Posts: 31	Thanks man. I'm slowly figuring all this out. I do believe that they are jets. Now it's just a matter of dialing them in. Is the air/fuel screw at the bottom (one closest to the intake pipe) of the Mikuni. and if so does "2 and 1/8 turns out" mean that I screw it in all the way and then back it out 2 and 1/8 turns or the other way around? also if it helps I'm about 400 ft above sea level here.
	0

01-27-2010, 09:18 PM	#23
waynev Join Date: Aug 2009 Location: London, Ontario Posts: 1,097	Hey think, if that's one of the standard mikuni type carbs then for tuning you will have a pilot jet, main jet, needle jet, jet needle and the slide valve, if you want to get more familiar with what each controls then have a quick read of this page http://www.iwt.com.au/mikunicarb.htm On the outside of the carb you will be adjusting the air/fuel screw and that silver colored one is probably your idle screw, your pilot and main jet are accesed by removing the fuel bowl off the bottom of the carb.
	0

01-27-2010, 10:48 PM	#24
think Join Date: Jan 2010 Posts: 31	Right on! Thanks a bunch Wayne. That link was extremely helpful I was unaware that the two jets were located inside the fuel bowl, but now things are becoming more clear. I took apart my old carb to familiarize myself with everything and I see now why my bike was running so badly at higher speeds. I'm surprised it ran at all! You wouldn't believe the amount of gook and calcium deposits in my old Sheng Wey carb. The holes in the jets were all but completely blocked. I cleaned most of it out already or I would have taken a pic of it to show you guys. It looked like hell. I plan on getting a fuel filter to put on my fuel line before I even test the new carb. I'll work on getting some pics up and starting a new thread. Thanks to all who replied. It is much appreciated.
	0

08-25-2018, 04:53 PM	#25
Kivi Join Date: May 2017 Location: Serbia Posts: 217	Hi, I have Sheng Wey PD1 carb and was wondering about the correct float level. Bike was running OK at first, but now it has some rich condition, high consumption, spark plug is totaly black. Anyone know the correct float level for this PD1 carb?
	0

08-27-2018, 06:57 AM	#27
Kivi Join Date: May 2017 Location: Serbia Posts: 217	I did it this way, thanks! EDIT: And that is 14mm. Last edited by Kivi; 08-27-2018 at 03:04 PM.
	1