Nibbi 28pe

Ol,fart · 06-06-2023, 01:00 AM

Replacing pz30 with nibbi 28pe. Looking for recommendations on where to start jet wise.
Hawk 250 decat, 4degree advance, ported & polished head shaved 1mm.
Elevation approx 1000 ft mostly ridden in 80 to105 degree temperatures. First time nibbi user. Arrived today with 1 extra pilot and 3 extra main jets. Have not checked installed jets yet. Included instructions seem pretty useless. I'm assuming the brass screw near the intake is the idle air adjustment as the only other screw appears to be the bowl drain.
Haven't really had a chance to look it over yet. But thought someone here would know more about it than me.
TIA Billy

XLsior · 06-06-2023, 01:07 AM

38 or 40 pilot and a 120 to 125 main.

Needle on mid/3rd clip.

Foam Uni style filter...

Megadan · 06-06-2023, 02:20 PM

At least a 125 main. I would suggeat starting with a 130 or 135 to be safe. My ported head with a cam (also 1mm decked) ran a 145.

Pilot, I found the 38 to work the best for me. 35 was a tad lean at 1/8th throttle, but, again, cam involved that may slightly change things. Mixture screw on mine was at 1 3/4 turns out

The brass screw near the intake is the idle mixture screw, and adjusts air. Open - leaner, close - richer.

Ol,fart · 06-07-2023, 11:00 PM

Quote:

Originally Posted by Megadan

At least a 125 main. I would suggeat starting with a 130 or 135 to be safe. My ported head with a cam (also 1mm decked) ran a 145.

Pilot, I found the 38 to work the best for me. 35 was a tad lean at 1/8th throttle, but, again, cam involved that may slightly change things. Mixture screw on mine was at 1 3/4 turns out

The brass screw near the intake is the idle mixture screw, and adjusts air. Open - leaner, close - richer.

Follow up question, anyone sell better valve springs? Broke inner intake spring and destroyed the head on the test ride. The new carb was working great though.

Megadan · 06-08-2023, 06:46 AM

Quote:

Originally Posted by Ol,fart

Follow up question, anyone sell better valve springs? Broke inner intake spring and destroyed the head on the test ride. The new carb was working great though.

I am sure there are springs out there that work, but I haven't had an issue yet so I never looked into it.

06-06-2023, 01:00 AM	#1
Ol,fart Join Date: Jan 2022 Location: Gatesville Texas Posts: 161	Nibbi 28pe Replacing pz30 with nibbi 28pe. Looking for recommendations on where to start jet wise. Hawk 250 decat, 4degree advance, ported & polished head shaved 1mm. Elevation approx 1000 ft mostly ridden in 80 to105 degree temperatures. First time nibbi user. Arrived today with 1 extra pilot and 3 extra main jets. Have not checked installed jets yet. Included instructions seem pretty useless. I'm assuming the brass screw near the intake is the idle air adjustment as the only other screw appears to be the bowl drain. Haven't really had a chance to look it over yet. But thought someone here would know more about it than me. TIA Billy __________________ 2021 RPS Hawk "IKEA" (Came in a box with no instructions) 110 main jet 1washer,2.5 sprockets and the cat fell off( with a little help) 1984 Honda V65 Magna "Daddy's Little Monster" To whoever stole my anti-depressants. I Hope Your Happy !
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06-06-2023, 02:20 PM	#3
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,042	At least a 125 main. I would suggeat starting with a 130 or 135 to be safe. My ported head with a cam (also 1mm decked) ran a 145. Pilot, I found the 38 to work the best for me. 35 was a tad lean at 1/8th throttle, but, again, cam involved that may slightly change things. Mixture screw on mine was at 1 3/4 turns out The brass screw near the intake is the idle mixture screw, and adjusts air. Open - leaner, close - richer. __________________ 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
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06-06-2023, 01:07 AM	#2
XLsior Join Date: Aug 2020 Location: Australia Posts: 1,316	38 or 40 pilot and a 120 to 125 main. Needle on mid/3rd clip. Foam Uni style filter...
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