Correct carb adjustments for the hawk 250

Jimmie · 01-21-2021, 09:34 AM

Does anyone have any advice on the carb settings on a hawk 250? I have messed with it several times and I can't get it right I have a 100 jet and I might upgrade to a 110 soon.

Here is a video of my bike it still runs about the same. What do you guys think? I have a Mikuni clone.

Megadan · 01-21-2021, 10:10 AM

Mikuni clone. With genuine mikuni jets (or OEM equivalents from JetsRus). Completely stock bike. Altitude below 5000ft. temps???

Main 105 (If at sea level and the temps are below 50F it MAY need a 107.5 or 110)
Pilot 25.
Needle 4th notch down from the top
Idle mixture screw 1 1/2 turns out from lightly seated. (the screw underneath, not on the side). Idle mixture will likely need a little fine tuning, the 1 1/2 turns is just a generic starting point, but should be fairly close.

Jimmie · 01-21-2021, 10:13 AM

Quote:

Originally Posted by Megadan

Mikuni clone. With genuine mikuni jets (or OEM equivalents from JetsRus). Completely stock bike. Altitude below 5000ft. temps???

Main 105 (If at sea level and the temps are below 50F it MAY need a 107.5 or 110)
Pilot 25.
Needle 4th notch down from the top
Idle mixture screw 1 1/2 turns out from lightly seated. (the screw underneath, not on the side). Idle mixture will likely need a little fine tuning, the 1 1/2 turns is just a generic starting point, but should be fairly close.

I purchased this jet kit off amazon and swapped the default one out. And I live in Ohio not sure about the altitude.

https://www.amazon.com/exec/obidos/A...im/refuge08-20

Other then the spark plug/carb everything else is stock.

TxTaoRider · 01-21-2021, 10:21 AM

Can you be more specific as to what throttle position it's not running right? The idle mixture screw/pilot jet controls the mixture at idle up to about 1/8 throttle. The slide cutout from about 1/8 to 1/4, the needle about 1/4 to 3/4, and main jet about 3/4 to full throttle. The circuits overlap some.
If you really like fine tuning the curves of the pilot circuit an main circuits, you can replace the pilot air jet and main air jet (located at the entry of these carbs). Then you can play with different needle tapers...

But what you're probably wanting is a main jet suggestion. I'd use a 105 or 110 Mikuni on a stock motor.

TxTaoRider · 01-21-2021, 10:23 AM

Also, your valve lash should be set as it can ack like a netting issue.

Jimmie · 01-21-2021, 10:32 AM

Quote:

Originally Posted by TxTaoRider

Can you be more specific as to what throttle position it's not running right? The idle mixture screw/pilot jet controls the mixture at idle up to about 1/8 throttle. The slide cutout from about 1/8 to 1/4, the needle about 1/4 to 3/4, and main jet about 3/4 to full throttle. The circuits overlap some.
If you really like fine tuning the curves of the pilot circuit an main circuits, you can replace the pilot air jet and main air jet (located at the entry of these carbs). Then you can play with different needle tapers...

But what you're probably wanting is a main jet suggestion. I'd use a 105 or 110 Mikuni on a stock motor.

I posted a video in the thread but to me it just doesn't sound right it runs fine but I can't get the adjustment perfect.

TxTaoRider · 01-21-2021, 10:47 AM

Im sorry, I just listened to the video and it's hard to tell much like that. My 1st question is, was the bike fully warmed up? Like at least 5 minutes... 10 is better. 2nd, I couldn't tell if you had the choke on.

Jimmie · 01-21-2021, 10:56 AM

Quote:

Originally Posted by TxTaoRider

Im sorry, I just listened to the video and it's hard to tell much like that. My 1st question is, was the bike fully warmed up? Like at least 5 minutes... 10 is better. 2nd, I couldn't tell if you had the choke on.

Choke on half, Bike was warmed up for 5-10 minutes before the video.

Wild Dog · 01-21-2021, 10:58 AM

Going to leave this here.

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TxTaoRider · 01-21-2021, 11:44 AM

Unless it's less than about 45f outside the choke should be completely off in 5 or 6 minutes. So you might start by turning the idle mixture screw out about 1/4 - 1/2 turn. The bike will never rev properly with a butterfly style choke closed.

Megadan · 01-21-2021, 08:16 PM

Trust me, the jetting figures I put up have worked for hundreds of bikes. Give it a try.

EDIT: The jets you bought are knock offs and inconsistent, but they should work well enough. The issue is, you bought only main jets. There is also the pilot jet to consider, and I don't know what your carb has.

01-21-2021, 09:34 AM	#1
Jimmie Join Date: Dec 2020 Posts: 37	Correct carb adjustments for the hawk 250 Does anyone have any advice on the carb settings on a hawk 250? I have messed with it several times and I can't get it right I have a 100 jet and I might upgrade to a 110 soon. Here is a video of my bike it still runs about the same. What do you guys think? I have a Mikuni clone.
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01-21-2021, 10:10 AM	#2
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,030	Mikuni clone. With genuine mikuni jets (or OEM equivalents from JetsRus). Completely stock bike. Altitude below 5000ft. temps??? Main 105 (If at sea level and the temps are below 50F it MAY need a 107.5 or 110) Pilot 25. Needle 4th notch down from the top Idle mixture screw 1 1/2 turns out from lightly seated. (the screw underneath, not on the side). Idle mixture will likely need a little fine tuning, the 1 1/2 turns is just a generic starting point, but should be fairly close. __________________ 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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01-21-2021, 10:21 AM	#4
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	Can you be more specific as to what throttle position it's not running right? The idle mixture screw/pilot jet controls the mixture at idle up to about 1/8 throttle. The slide cutout from about 1/8 to 1/4, the needle about 1/4 to 3/4, and main jet about 3/4 to full throttle. The circuits overlap some. If you really like fine tuning the curves of the pilot circuit an main circuits, you can replace the pilot air jet and main air jet (located at the entry of these carbs). Then you can play with different needle tapers... But what you're probably wanting is a main jet suggestion. I'd use a 105 or 110 Mikuni on a stock motor. __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
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01-21-2021, 10:23 AM	#5
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	Also, your valve lash should be set as it can ack like a netting issue. __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
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01-21-2021, 10:47 AM	#7
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	Im sorry, I just listened to the video and it's hard to tell much like that. My 1st question is, was the bike fully warmed up? Like at least 5 minutes... 10 is better. 2nd, I couldn't tell if you had the choke on. __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
	0

01-21-2021, 10:58 AM	#9
Wild Dog Join Date: Dec 2016 Location: Argentina Posts: 756	Going to leave this here.
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01-21-2021, 11:44 AM	#10
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	Unless it's less than about 45f outside the choke should be completely off in 5 or 6 minutes. So you might start by turning the idle mixture screw out about 1/4 - 1/2 turn. The bike will never rev properly with a butterfly style choke closed. __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
	0

01-21-2021, 08:16 PM	#11
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,030	Trust me, the jetting figures I put up have worked for hundreds of bikes. Give it a try. EDIT: The jets you bought are knock offs and inconsistent, but they should work well enough. The issue is, you bought only main jets. There is also the pilot jet to consider, and I don't know what your carb has. __________________ 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; 01-21-2021 at 09:36 PM.
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