Less than $28 for carb + jet kit

pcspecialist · 07-13-2017, 05:17 PM

You read right, you can get a Keihin + slow jets + main jets for under $28 delivered. Even less if you don't mind waiting for jets but I didn't mind paying an extra $4 for a US source.

Carb: http://www.ebay.com/itm/30mm-PZ30-Ca...-/282362473575

Jets: http://www.ebay.com/itm/10Pcs-Set-Sl...t/302366509608

Swap choke levers, put a #42 slow in it, #115 main, needle clip in the middle, idle mixture screw one turn out (sea level, opened up exhaust and air box), and you are good to go.

For reference, the slow jet the carb comes with appears to be a #38. The drill bit that snugly fits a #38 Keihin, snugly fits the unmarked one that comes with the carb.

If you are willing to take a chance, there are other PZ30 carbs on ebay for less, some even have the proper choke lever, but, I can't guarantee they take a real Keihin PZ30 slow jet.

So far I'm liking this carb every bit as much as the Mikuni I had on my Hawk, if I find there is no advantage to the Mikuni, I may sell it and a bunch of jets for $25. I have a thumb idle mixture screw on it.

Megadan · 07-13-2017, 05:41 PM

Keihin jet numbers for the ones pictured.

Main - 99101-393
Pilot - N424-21

That said, I bought jets from the same company you listed and also found them to be within the same specs as the factory Keihin jets, so they are hard to beat for the price. These same jets also work on the OKO/PWK flat slide copies.

On the subject of PZ30's, you also have the option to get the "pumper" version with an accelerator pump for on throttle enrichment. They are usually a tiny bit more expensive and require a dual ended throttle cable - which many of them come with.
Link for an example of one. http://www.ebay.com/itm/Keihin-PZ30-...5YrqyW&vxp=mtr

There is nothing wrong with the PZ30 style carburetor. I think so many people are averse to it because it gets associated with the sealed stock units and their funky pilot jet. Operationally, the PZ30 and VM26 clones are identical. This is a cheaper alternative to the VM26 clone, and for the same price as one you get the carb and a bunch of jets.

In fact, the one you linked has a dual purpose choke lever. It looks like it can be cable OR lever operated, so for anybody wanting to do a choke cable so they don't have to reach though the bike, this would be a great option as well.

Ariel Red Hunter · 07-13-2017, 05:46 PM

Quote:

Originally Posted by pcspecialist

You read right, you can get a Keihin + slow jets + main jets for under $28 delivered. Even less if you don't mind waiting for jets but I didn't mind paying an extra $4 for a US source.

Carb: http://www.ebay.com/itm/30mm-PZ30-Ca...-/282362473575

Jets: http://www.ebay.com/itm/10Pcs-Set-Sl...t/302366509608

Swap choke levers, put a #42 slow in it, #115 main, needle clip in the middle, idle mixture screw one turn out (sea level, opened up exhaust and air box), and you are good to go.

For reference, the slow jet the carb comes with appears to be a #38. The drill bit that snugly fits a #38 Keihin, snugly fits the unmarked one that comes with the carb.

If you are willing to take a chance, there are other PZ30 carbs on ebay for less, some even have the proper choke lever, but, I can't guarantee they take a real Keihin PZ30 slow jet.

So far I'm liking this carb every bit as much as the Mikuni I had on my Hawk, if I find there is no advantage to the Mikuni, I may sell it and a bunch of jets for $25. I have a thumb idle mixture screw on it.

Yes, that is a great deal for what you are getting. The problem with Keihins has always been getting the jets for it. This solves that problem....ARH

pcspecialist · 07-13-2017, 07:47 PM

Another option is a #78 or even #77 drill bit to the OEM slow jet. My set doesn't go large enough to do the fast jets so I'm not sure what size you need for that.

Megadan · 07-13-2017, 07:53 PM

I forgot to mention something else I wanted to point out. Many people that re-jet the stock PZ30 clones often run a Mikuni 110 main jet. If you use actual Keihin jets in a PZ30, the jet sizes you see are going to actually be different.

The orifice size equates to a different jet number between the two.

I.E. A 110 Mikuni main jet uses a #56 drill bit size. The equivalent Keihin jet size that uses the same 56 drill bit is a 125. A 105 Mikuni is equivalent to a 118 Keihin.

pcspecialist · 07-14-2017, 12:27 AM

I ended up using a large round (Mikuni N100.604) 112.5 because there was no 112.5 in the kit and I had the N100.604. Any smaller and there is a power gain when letting off the throttle some so I know I have the perfect size jet. One day I will check plug color even though I know it is spot on. Yes, the 115 might run a little cooler, but, the 112.5 isn't too lean/hot and will get me better milage.

Megadan · 07-14-2017, 03:13 AM

If these jets are true to form with the genuine ones, then a Keihin 128 is the same size as a 112.5 Mikuni. Both should be a 1.2mm orifice. I have always wondered if the chinese jets followed this same rule, or if they just stuck to Mikuni Jet sizing even with the Keihin clones.

I don't know if you have a way to measure them (or even have both on hand), but if you have a way to measure them compare the 110 Keihin jet to a 100 Mikuni They should both be a #58 micro bit.

pcspecialist · 07-14-2017, 10:46 AM

I wish my micro bits made it to the 50s, I would check all the main jets.

emptypockets · 07-14-2017, 12:03 PM

What's the difference between this carb and the sheng wey pz30 that came stock?

Ariel Red Hunter · 07-14-2017, 01:55 PM

Quote:

Originally Posted by emptypockets

What's the difference between this carb and the sheng wey pz30 that came stock?

The Sheng Wei carb does not have replaceable pilot jets. In order to change the pilot jet, you have to pull out the pilot jet tube, then tap in new threads in order to use Keihin pilot jets. With this carb kit, you get a Keihin clone and ten main jets and ten pilot jets...ARH

pcspecialist · 07-14-2017, 04:45 PM

Quote:

Originally Posted by Ariel Red Hunter

The Sheng Wei carb does not have replaceable pilot jets. In order to change the pilot jet, you have to pull out the pilot jet tube, then tap in new threads in order to use Keihin pilot jets. With this carb kit, you get a Keihin clone and ten main jets and ten pilot jets...ARH

correct, and the tap will cost almost as much as the Keihin so there's no point in doing it.

pcspecialist · 07-14-2017, 05:00 PM

Thanks, Megadan, for the info on jet sizes. Hopefully, I'll have the right size drill bits to see what sizes actually came in the kit before I return the jet kit due to the missized 115. Drill bits are coming Amazon Prime so should be here Monday if not Sunday.

pcspecialist · 07-14-2017, 05:27 PM

The pumper is tempting. Could probably remove the choke butterfly and instead pump the throttle a few times to get the engine started in cold weather.

pete · 07-14-2017, 05:35 PM

Quote:

Originally Posted by pcspecialist

The pumper is tempting. Could probably remove the choke butterfly and instead pump the throttle a few times to get the engine started in cold weather.

No sorry that won't work....
you need a metered flow not a squirt of raw fuel
everytime you twist the throttle...
revs are required to handle the squirt of fuel at idle
revs you will just flood the motor...

...

pcspecialist · 07-14-2017, 05:38 PM

I only need the choke for the split second when starting so it would work unless temps dropped lower than what I've cold started at in the past.

07-13-2017, 05:41 PM	#2
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,991	Keihin jet numbers for the ones pictured. Main - 99101-393 Pilot - N424-21 That said, I bought jets from the same company you listed and also found them to be within the same specs as the factory Keihin jets, so they are hard to beat for the price. These same jets also work on the OKO/PWK flat slide copies. On the subject of PZ30's, you also have the option to get the "pumper" version with an accelerator pump for on throttle enrichment. They are usually a tiny bit more expensive and require a dual ended throttle cable - which many of them come with. Link for an example of one. http://www.ebay.com/itm/Keihin-PZ30-...5YrqyW&vxp=mtr There is nothing wrong with the PZ30 style carburetor. I think so many people are averse to it because it gets associated with the sealed stock units and their funky pilot jet. Operationally, the PZ30 and VM26 clones are identical. This is a cheaper alternative to the VM26 clone, and for the same price as one you get the carb and a bunch of jets. In fact, the one you linked has a dual purpose choke lever. It looks like it can be cable OR lever operated, so for anybody wanting to do a choke cable so they don't have to reach though the bike, this would be a great option as well. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	1

07-13-2017, 05:17 PM	#1
pcspecialist Join Date: May 2016 Posts: 583	Less than $28 for carb + jet kit You read right, you can get a Keihin + slow jets + main jets for under $28 delivered. Even less if you don't mind waiting for jets but I didn't mind paying an extra $4 for a US source. Carb: http://www.ebay.com/itm/30mm-PZ30-Ca...-/282362473575 Jets: http://www.ebay.com/itm/10Pcs-Set-Sl...t/302366509608 Swap choke levers, put a #42 slow in it, #115 main, needle clip in the middle, idle mixture screw one turn out (sea level, opened up exhaust and air box), and you are good to go. For reference, the slow jet the carb comes with appears to be a #38. The drill bit that snugly fits a #38 Keihin, snugly fits the unmarked one that comes with the carb. If you are willing to take a chance, there are other PZ30 carbs on ebay for less, some even have the proper choke lever, but, I can't guarantee they take a real Keihin PZ30 slow jet. So far I'm liking this carb every bit as much as the Mikuni I had on my Hawk, if I find there is no advantage to the Mikuni, I may sell it and a bunch of jets for $25. I have a thumb idle mixture screw on it.
	4

07-13-2017, 07:47 PM	#4
pcspecialist Join Date: May 2016 Posts: 583	Another option is a #78 or even #77 drill bit to the OEM slow jet. My set doesn't go large enough to do the fast jets so I'm not sure what size you need for that.
	0

07-13-2017, 07:53 PM	#5
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,991	I forgot to mention something else I wanted to point out. Many people that re-jet the stock PZ30 clones often run a Mikuni 110 main jet. If you use actual Keihin jets in a PZ30, the jet sizes you see are going to actually be different. The orifice size equates to a different jet number between the two. I.E. A 110 Mikuni main jet uses a #56 drill bit size. The equivalent Keihin jet size that uses the same 56 drill bit is a 125. A 105 Mikuni is equivalent to a 118 Keihin. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 Last edited by Megadan; 07-14-2017 at 03:18 AM.
	0

07-14-2017, 12:27 AM	#6
pcspecialist Join Date: May 2016 Posts: 583	I ended up using a large round (Mikuni N100.604) 112.5 because there was no 112.5 in the kit and I had the N100.604. Any smaller and there is a power gain when letting off the throttle some so I know I have the perfect size jet. One day I will check plug color even though I know it is spot on. Yes, the 115 might run a little cooler, but, the 112.5 isn't too lean/hot and will get me better milage.
	0

07-14-2017, 03:13 AM	#7
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,991	If these jets are true to form with the genuine ones, then a Keihin 128 is the same size as a 112.5 Mikuni. Both should be a 1.2mm orifice. I have always wondered if the chinese jets followed this same rule, or if they just stuck to Mikuni Jet sizing even with the Keihin clones. I don't know if you have a way to measure them (or even have both on hand), but if you have a way to measure them compare the 110 Keihin jet to a 100 Mikuni They should both be a #58 micro bit. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	0

07-14-2017, 10:46 AM	#8
pcspecialist Join Date: May 2016 Posts: 583	I wish my micro bits made it to the 50s, I would check all the main jets.
	0

07-14-2017, 12:03 PM	#9
emptypockets Join Date: Jun 2017 Location: Colorado Posts: 44	What's the difference between this carb and the sheng wey pz30 that came stock?
	0

07-14-2017, 05:00 PM	#12
pcspecialist Join Date: May 2016 Posts: 583	Thanks, Megadan, for the info on jet sizes. Hopefully, I'll have the right size drill bits to see what sizes actually came in the kit before I return the jet kit due to the missized 115. Drill bits are coming Amazon Prime so should be here Monday if not Sunday.
	0

07-14-2017, 05:27 PM	#13
pcspecialist Join Date: May 2016 Posts: 583	The pumper is tempting. Could probably remove the choke butterfly and instead pump the throttle a few times to get the engine started in cold weather.
	0

07-14-2017, 05:38 PM	#15
pcspecialist Join Date: May 2016 Posts: 583	I only need the choke for the split second when starting so it would work unless temps dropped lower than what I've cold started at in the past.
	0