PZ30 Tuning

Joshlaird · 06-14-2019, 06:56 PM

It seems there is a ton of info on these PZ30s but some specific info I’m looking for is hard to find. I would like to know what jets you have, where you have the needle set, elevation, and mods. Maybe we can collect this together in one thread for new ppl like me to get an idea where to start.

I have no mods yet. Planning on opening up the air box and a PZ30 Pumper carb and that’s about it. I’m going to try a 42 pilot, 110 main, and the needle set on the 3rd notch down. I’m nearly at sea level.

Hopefully that’s a good starting place for me. I really don’t know. Once I get it installed I will edit this post with those results. Hopefully this type of thread hasn’t already been done. Thanks guys!

Air_male · 06-14-2019, 07:16 PM

Bashan DB-47 250
Keihin PZ 30
120main 38pilot clip 4 down from top of needle
1 3/4 out on mixture screw
Airbox snorkel removed and egr deleted
Top speed 66mph on speedo not gps verified

Thanks to NZ for getting me the assortment of pilot, main jets and all the extra stuff I want for tuning.
Thanks to all who take the time to answer dumb questions even though they've been asked a million times previously.

Megadan · 06-14-2019, 08:22 PM

Hawk 250: PZ30B (pumper). Main 125, Pilot 45(needs a 48), Mixture 2 1/4 out. Needle 3rd notch (middle). Elevation. 1100ft.

Mods. Ported/polished and decked cylinder head (10.3:1 compression approximately), foam pod filter, ebay exhaust, ngk DPR8EIX-9 plug with halved length wire and XDO5 cap with resistor removed.

China Rider 27 · 06-14-2019, 10:55 PM

Hawk 250: PZ30. Main 110. Stock Pilot. Mixture 1 ½ out, two washers under the needle. Elevation 210 ft. Airbox mod. Stock exhaust. 65 mph with 13t 35t at 70 degrees temp.

OneLeggedRider · 06-15-2019, 07:10 AM

Quote:

Originally Posted by Megadan

Hawk 250: PZ30B (pumper). Main 125, Pilot 45(needs a 48), Mixture 2 1/4 out. Needle 3rd notch (middle). Elevation. 1100ft.

Mods. Ported/polished and decked cylinder head (10.3:1 compression approximately), foam pod filter, ebay exhaust, ngk DPR8EIX-9 plug with halved length wire and XDO5 cap with resistor removed.

Just curious as to why you removed the resistor.

Megadan · 06-15-2019, 12:01 PM

Quote:

Originally Posted by OneLeggedRider

Just curious as to why you removed the resistor.

plug already had one.

GronkFries · 06-16-2019, 01:30 PM

PZ30 (The newer style with cold start jets) 105 Main, 40 Cold Start, Needle jet clip adjusted in middle notch. Pilot 2 1/4 turns out.

Runs like a bastard out of a brothel now! Slight, slight decel backfiring but not enough for me to care. I'll replace the plug someday and check color thoroughly when I feel like it.

Cravin01 · 06-16-2019, 01:56 PM

PZ30 pumper(Cold Start Jets) 115 main, 40 pilot. middle notch I think? 430 feet above sea level outside of Dallas.

Finally got the decel backfires gone, pulls hard and I can kick start it now.

bikeman · 06-16-2019, 06:56 PM

stock pz30 carb. Altitude 0 at NJ shore. 110 main, stock pilot, two small washers under needle E-clip. mix currently 2.5 turns out. Pain in the ASS to start. mix might be wrong?

Megadan · 06-16-2019, 07:02 PM

Quote:

Originally Posted by bikeman

stock pz30 carb. Altitude 0 at NJ shore. 110 main, stock pilot, two small washers under needle E-clip. mix currently 2.5 turns out. Pain in the ASS to start. mix might be wrong?

Stock pilot as in a 40? Do you have any mods?

bikeman · 06-16-2019, 07:22 PM

Quote:

Originally Posted by Megadan

Stock pilot as in a 40? Do you have any mods?

Yes the stock 40 pilot jet. from what I read, it isnt replaceable on the shengwey. everything else stock, no mods. battery removed because i burned it out and it wont charge. I did replace the main 98 with a 100 jet on ebay. Think it was sold as a "mikuni". FWIW, it will start and stay running nicely, but it is a PITA to kickstart. Ive had other 4t dirtbikes that start on one kick, not this one. My procedure is half-throttle half-choke kick when cold, and full throttle kick no choke when hot. Doesn't always go though.

Megadan · 06-16-2019, 08:02 PM

Quote:

Originally Posted by bikeman

Yes the stock 40 pilot jet. from what I read, it isnt replaceable on the shengwey. everything else stock, no mods. battery removed because i burned it out and it wont charge. I did replace the main 98 with a 100 jet on ebay. Think it was sold as a "mikuni". FWIW, it will start and stay running nicely, but it is a PITA to kickstart. Ive had other 4t dirtbikes that start on one kick, not this one. My procedure is half-throttle half-choke kick when cold, and full throttle kick no choke when hot. Doesn't always go though.

Get in touch with nzbrakelathes here. He managed to get his hands on the Hawk style pilot jets. You being at sea level you might benefit from a 45 pilot jet.

Joshlaird · 06-16-2019, 08:45 PM

I got the kit from nzbrakelathes and it comes with everything needed for the pilot and the main jets and other useful rebuild parts. It comes with a 42 and a 45 pilot.

GronkFries · 06-16-2019, 09:52 PM

Yes, take the jet out and snap a photo of it - He will be able to tell you if it's the one he has.

XDoubleXA · 06-20-2019, 11:08 AM

40 pilot jet, 120 main, 1 3/4 to 2 turns out, needle on last notch, and UNI filter. 981 ft above sea level.

06-14-2019, 06:56 PM	#1
Joshlaird Join Date: May 2019 Posts: 47	PZ30 Tuning It seems there is a ton of info on these PZ30s but some specific info I’m looking for is hard to find. I would like to know what jets you have, where you have the needle set, elevation, and mods. Maybe we can collect this together in one thread for new ppl like me to get an idea where to start. I have no mods yet. Planning on opening up the air box and a PZ30 Pumper carb and that’s about it. I’m going to try a 42 pilot, 110 main, and the needle set on the 3rd notch down. I’m nearly at sea level. Hopefully that’s a good starting place for me. I really don’t know. Once I get it installed I will edit this post with those results. Hopefully this type of thread hasn’t already been done. Thanks guys!
	2

06-14-2019, 07:16 PM	#2
Air_male Join Date: Mar 2019 Posts: 24	Bashan DB-47 250 Keihin PZ 30 120main 38pilot clip 4 down from top of needle 1 3/4 out on mixture screw Airbox snorkel removed and egr deleted Top speed 66mph on speedo not gps verified Thanks to NZ for getting me the assortment of pilot, main jets and all the extra stuff I want for tuning. Thanks to all who take the time to answer dumb questions even though they've been asked a million times previously. Last edited by Air_male; 06-14-2019 at 07:48 PM.
	3

06-14-2019, 08:22 PM	#3
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,986	Hawk 250: PZ30B (pumper). Main 125, Pilot 45(needs a 48), Mixture 2 1/4 out. Needle 3rd notch (middle). Elevation. 1100ft. Mods. Ported/polished and decked cylinder head (10.3:1 compression approximately), foam pod filter, ebay exhaust, ngk DPR8EIX-9 plug with halved length wire and XDO5 cap with resistor removed. __________________ 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; 06-14-2019 at 10:30 PM.
	2

06-16-2019, 01:56 PM	#8
Cravin01 Join Date: Jan 2018 Location: Forney Texas Posts: 498	PZ30 pumper(Cold Start Jets) 115 main, 40 pilot. middle notch I think? 430 feet above sea level outside of Dallas. Finally got the decel backfires gone, pulls hard and I can kick start it now. __________________ Visit me on YouTube at "Project Next"! https://www.youtube.com/channel/UC6KTCi2GVbfRDv-2XCqHhsg?view_as=subscriber 2017 Bashan Storm Keihen PZ30 Pumper Carb,115 main jet,35 pilot jet, gutted factory exhaust, Sambo Digital Speedometer,LED blinkers, H4 headlight,D.I.D X-ring chain 428,17/42 sprockets,UNI cone filter.
	0

06-20-2019, 11:08 AM	#15
XDoubleXA Join Date: Apr 2017 Location: Ohio Posts: 89	40 pilot jet, 120 main, 1 3/4 to 2 turns out, needle on last notch, and UNI filter. 981 ft above sea level. __________________ Bashan Shark, Keihen PZ30 Carb, Pilot 40, Main 120, Uni Filter, Exhaust, MSR Shifter, and some stickers.
	0

06-14-2019, 10:55 PM	#4
China Rider 27 Join Date: Dec 2018 Location: PNW Posts: 982	Hawk 250: PZ30. Main 110. Stock Pilot. Mixture 1 ½ out, two washers under the needle. Elevation 210 ft. Airbox mod. Stock exhaust. 65 mph with 13t 35t at 70 degrees temp.
	1

06-16-2019, 01:30 PM	#7
GronkFries Join Date: May 2019 Location: Maine Posts: 111	PZ30 (The newer style with cold start jets) 105 Main, 40 Cold Start, Needle jet clip adjusted in middle notch. Pilot 2 1/4 turns out. Runs like a bastard out of a brothel now! Slight, slight decel backfiring but not enough for me to care. I'll replace the plug someday and check color thoroughly when I feel like it.
	1

06-16-2019, 06:56 PM	#9
bikeman Join Date: Apr 2019 Posts: 26	stock pz30 carb. Altitude 0 at NJ shore. 110 main, stock pilot, two small washers under needle E-clip. mix currently 2.5 turns out. Pain in the ASS to start. mix might be wrong?
	0

06-16-2019, 08:45 PM	#13
Joshlaird Join Date: May 2019 Posts: 47	I got the kit from nzbrakelathes and it comes with everything needed for the pilot and the main jets and other useful rebuild parts. It comes with a 42 and a 45 pilot.
	0

06-16-2019, 09:52 PM	#14
GronkFries Join Date: May 2019 Location: Maine Posts: 111	Yes, take the jet out and snap a photo of it - He will be able to tell you if it's the one he has.
	0