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#1 |
Join Date: Apr 2024
Posts: 11
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proper jetting For 4,100 ft
hey i could use some suggestions on jetting my carb. 2018 bms 250 crp or basically 2018 hawk 250. heres my situation does alright at lower speeds but cuts out alot at high rpms and at the end of the gears im pretty sure the jets are to big. i have a 32mm pwk amazon carb on it now i know thats a little to big of a carb for the bike but working with what i got. what would be the ball park on size of jets i should put in it im at 4,065ft to 4,330ft of elevation? or would i just be better of getting a 30mm carb and if so what would be the ball park jets to use on it. thanks in advance
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#2 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,651
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A 32PWK is a bit on the large size for a stock motor. Even a 30 PKW can be a pain to tune. The best carb for your bike would be a Nibbi PE28fl. Easier to tune and work great with these engines. https://amzn.to/3R1vQg0
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2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 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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#3 |
Join Date: Jun 2023
Location: Big Piney, WY
Posts: 530
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What is your current jetting? If it's cutting at full throttle but fine at all other ranges of throttle, I'd say try leaning your main jet, whatever it is.
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2023 Hawk 250 from XPRO off of Amazon MOUNTAIN MAN RC + MOTO on YouTube "If there were more bloody noses, there would be less wars." - Hagbard Celine "Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin |
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#4 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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A 32mm isn't just a little too big. You will probably never get it to run right all the time and in all conditions.
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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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#5 |
Join Date: Apr 2024
Posts: 11
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ok thanks jerry hawk you wouldnt happen to have a link to a correct length throttle cable to go with that 28mm carb and what jets would you recomend for me? And big dan its choppy at all throttle posistions but still rideable then bogs at higher rpm and speeds the jets that came with it i believe are 130 and a 30 ive tried leaning it but doesnt seem to change anything i went 3 turns.
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#6 |
Join Date: Apr 2024
Posts: 11
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ok thanks megadan sounds like ill be ordering a new carb today
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#7 |
Join Date: Aug 2013
Posts: 244
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I would recommend a PZ28.
For reference, a lot of people closer to sea level start with a 35-40 pilot, and a 100-110 main. If I were you, I'd start with a 30 pilot and 95 main due to your elevation, and work from there up or down. No one can tell, you have to experiment yourself. |
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#8 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Cheap PWK carbs are notoriously bad as well. Most never run right. Even Nibbi carbs get a bad one from time to time.
__________________
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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#9 |
Join Date: Aug 2020
Location: Australia
Posts: 1,343
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There is also the PZ27B and PZ30B pumper carbs which may or may not fit in the frame with the pumper assembly however it can be removed to run as a stock non pumper carb if needs be.
With or without the splitter cables https://www.aliexpress.com/item/1005...34231.html?spm https://www.aliexpress.com/item/1005...66696.html?spm |
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#11 | |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,651
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Quote:
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2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 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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#12 |
Join Date: Apr 2024
Posts: 11
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ok thanks for the help everyone i just ordered a pe28 should be here in a week. also ill try the stock cable when it gets here. i dont know if it makes a difference but i didnt mention that i got a aftermarket throttle handle would that work with stock cable?
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Tags |
carb tunning, hawk 250, jets |
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