Hawk 250 carb tuning problems, please help - Page 2

**JerryHawk250** · 11-13-2017, 11:31 AM

Quote:

Originally Posted by SeanM76

I was wondering if I should shim the needle or if I should change the smaller jet. I don't know what came stock there but I've heard maybe a 27.5 or 30 would be better. I'll try shimming again when I get home and see how that goes with the 110 in there.

How do I adjust the float and what am I looking for in terms of how it should be adjusted?

The pilot jet on the stock carb is a 20. Good luck finding a replacement jet, I don't think they exist. I'm still running the stock 20 pilot with no issues. As far as float adjustment, as Megadan stated just turn the carb upside-down and the seam in the float should run parallel with the flange. To adjust is just a matter of gently bending the tab that the float valve is attached to.

SeanM76 · 11-13-2017, 11:43 AM

http://www.partsreloaded.com/ATV-UTV...SABEgLmnvD_BwE

Isn't this the 30? My understanding is that all mikuni jets work on the stock hawk carb? Is that wrong?

**JerryHawk250** · 11-13-2017, 11:51 AM

This is what the Sheng Wey PZ30 has.

SeanM76 · 11-13-2017, 01:38 PM

I use this bike for street purposes. It'll rarely be off-road. Would I be better off getting:

MIKUNI VM26 Carburetor Quad ATV Dirt Pit Bike Dirtbike 250CC Carb 30MM https://www.amazon.com/dp/B0176TA1H4..._2yEcAbKGBEPB5

Or should I just stick with the current carb since realistically it's pretty close to being where it should be anyway

**JerryHawk250** · 11-13-2017, 01:45 PM

Quote:

Originally Posted by SeanM76

I use this bike for street purposes. It'll rarely be off-road. Would I be better off getting:

MIKUNI VM26 Carburetor Quad ATV Dirt Pit Bike Dirtbike 250CC Carb 30MM https://www.amazon.com/dp/B0176TA1H4..._2yEcAbKGBEPB5

Or should I just stick with the current carb since realistically it's pretty close to being where it should be anyway

If you are keeping the stock exhaust and air box the stock carb is tunable. Nothing wrong with the stock carb except finding pilot jets. If you plan on changing the exhaust out to a more open exhaust then that would be the carb to get because you will be able to find pilot jets easily. Personally i'm still using the stock carb and I have no problems with tuning. But I have plenty of experience in tuning carbs.

SeanM76 · 11-13-2017, 01:53 PM

Quote:

Originally Posted by JerryHawk250

If you are keeping the stock exhaust and air box the stock carb is tunable. Nothing wrong with the stock carb except finding pilot jets. If you plan on changing the exhaust out to a more open exhaust then that would be the carb to get because you will be able to find pilot jets easily. Personally i'm still using the stock carb and I have no problems with tuning. But I have plenty of experience in tuning carbs.

I plan on getting a new exhaust for her in the spring. I also have new sprockets I'll be putting on in the spring as well (17/45). Trying to find an o-ring chain, amazons out of the one it seems everyone uses

**JerryHawk250** · 11-13-2017, 02:01 PM

Quote:

Originally Posted by SeanM76

I plan on getting a new exhaust for her in the spring. I also have new sprockets I'll be putting on in the spring as well (17/45). Trying to find an o-ring chain, amazons out of the one it seems everyone uses

I would just keep the stock carb for now as the 20 pilot will be good for your current setup. 110 will put you close where you need to be for the cold weather. Depending on the thickness of the washer, 1 or 2 will shim it about right. I have 2 thin washers and idle mixture screw 1 1/2 turns out and runs perfect. I'm at sea level so this might be deferent if you at higher elevations. You can upgrade the carb when you do the other mods.

Megadan · 11-13-2017, 02:23 PM

I am literally holding the stock carb pilot jet in my hand from my 2017 Hawk. Hard as heck to read, but it says 40 for the size markings. It also matches the orifice size for a Keihin 40 pilot jet.

Now, the Mikuni carb most people buy comes with a 20 pilot jet (mikuni 20 size), and it is too small. That is likely where you saw people mention the 27.5 or 30.

From my own experience, at my 1000ft elevation, the Mikuni 25 pilot was still a hair lean, but still within the "good" spectrum. The 30 was just too big, and the 27.5 is a tiny bit rich, but does not carbon foul the plug. There has been people at sea level who found the 30 to work, but the 25 and 27.5 are likely to be the ticket for most bikes

For anybody new to carbs, jet sizes are not created equal. A 100 Mikuni and a 100 Keihin jet are actually sized differently. It is important to differentiate the two.

**JerryHawk250** · 11-13-2017, 02:29 PM

[QUOTE=Megadan;269130]I am literally holding the stock carb pilot jet in my hand from my 2017 Hawk. Hard as heck to read, but it says 40 for the size markings. It also matches the orifice size for a Keihin 40 pilot jet.
QUOTE]
That's strange, My 2016 Hawk is marked 20. I think they just stick whatever they have on hand at the time. lol

SeanM76 · 11-13-2017, 02:38 PM

Jerryhawk I'm in Toledo Ohio. We're slightly above sea level but not by much. I'd say our set ups would probably match each other's. I'm gonna shim it when I get home and see how she feels about it lol

**JerryHawk250** · 11-13-2017, 02:46 PM

Quote:

Originally Posted by SeanM76

Jerryhawk I'm in Toledo Ohio. We're slightly above sea level but not by much. I'd say our set ups would probably match each other's. I'm gonna shim it when I get home and see how she feels about it lol

Just curious. Check and see what size is stamped on your pilot jet installed on your carb.

SeanM76 · 11-13-2017, 03:08 PM

Quote:

Originally Posted by JerryHawk250

Just curious. Check and see what size is stamped on your pilot jet installed on your carb.

Mines a 20. Already looked at it last night.

**JerryHawk250** · 11-13-2017, 03:26 PM

Quote:

Originally Posted by SeanM76

Mines a 20. Already looked at it last night.

That's what I have. Megadan you must have one of them illegal carbs that got past EPA. lol

Megadan · 11-13-2017, 04:13 PM

Quote:

Originally Posted by JerryHawk250

That's what I have. Megadan you must have one of them illegal carbs that got past EPA. lol

Who knows. Another mystery for the ages. I had to use a magnifier to read mine, but it says 40. Either my stamping was messed up, or they may be using jets from 2 sources

pistolclass · 11-13-2017, 04:14 PM

I have a stock exhaust and stock air box. I have 110 main with a 20 pilot. I have the shim on full rich an the screw to 2 turns out. My hawk runs and starts great. I know that I should be in the middle and not so turned out on the screw but it is running great. This is with the $30 Fakuni and Amazon whatever size main (110). I might just pick up another $30 and keep this set up in case I totally screw it up.

11-13-2017, 11:51 AM	#18
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,561	This is what the Sheng Wey PZ30 has. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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11-13-2017, 02:23 PM	#23
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,020	I am literally holding the stock carb pilot jet in my hand from my 2017 Hawk. Hard as heck to read, but it says 40 for the size markings. It also matches the orifice size for a Keihin 40 pilot jet. Now, the Mikuni carb most people buy comes with a 20 pilot jet (mikuni 20 size), and it is too small. That is likely where you saw people mention the 27.5 or 30. From my own experience, at my 1000ft elevation, the Mikuni 25 pilot was still a hair lean, but still within the "good" spectrum. The 30 was just too big, and the 27.5 is a tiny bit rich, but does not carbon foul the plug. There has been people at sea level who found the 30 to work, but the 25 and 27.5 are likely to be the ticket for most bikes For anybody new to carbs, jet sizes are not created equal. A 100 Mikuni and a 100 Keihin jet are actually sized differently. It is important to differentiate the two. __________________ 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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11-13-2017, 02:29 PM	#24
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,561	[QUOTE=Megadan;269130]I am literally holding the stock carb pilot jet in my hand from my 2017 Hawk. Hard as heck to read, but it says 40 for the size markings. It also matches the orifice size for a Keihin 40 pilot jet. QUOTE] That's strange, My 2016 Hawk is marked 20. I think they just stick whatever they have on hand at the time. lol __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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11-13-2017, 11:43 AM	#17
SeanM76 Join Date: Sep 2017 Location: Toledo, Ohio Posts: 19	http://www.partsreloaded.com/ATV-UTV...SABEgLmnvD_BwE Isn't this the 30? My understanding is that all mikuni jets work on the stock hawk carb? Is that wrong?
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11-13-2017, 01:38 PM	#19
SeanM76 Join Date: Sep 2017 Location: Toledo, Ohio Posts: 19	I use this bike for street purposes. It'll rarely be off-road. Would I be better off getting: MIKUNI VM26 Carburetor Quad ATV Dirt Pit Bike Dirtbike 250CC Carb 30MM https://www.amazon.com/dp/B0176TA1H4..._2yEcAbKGBEPB5 Or should I just stick with the current carb since realistically it's pretty close to being where it should be anyway
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11-13-2017, 02:38 PM	#25
SeanM76 Join Date: Sep 2017 Location: Toledo, Ohio Posts: 19	Jerryhawk I'm in Toledo Ohio. We're slightly above sea level but not by much. I'd say our set ups would probably match each other's. I'm gonna shim it when I get home and see how she feels about it lol
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11-13-2017, 04:14 PM	#30
pistolclass Join Date: Oct 2015 Location: connecticut Posts: 978	I have a stock exhaust and stock air box. I have 110 main with a 20 pilot. I have the shim on full rich an the screw to 2 turns out. My hawk runs and starts great. I know that I should be in the middle and not so turned out on the screw but it is running great. This is with the $30 Fakuni and Amazon whatever size main (110). I might just pick up another $30 and keep this set up in case I totally screw it up.
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