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#1 |
Join Date: Sep 2016
Posts: 103
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Recommended jetting?
I picked up one of these PWK clones for my OHC 223cc Zongshen motor, basically a Honda CRF230F(223cc) clone.
Has anyone dealt with this carb and can recommend some jetting to start with for tuning? The CRF230 guys say 120 main, 45 pilot but I can't figure out if that's Mikuni, stock carb, OKO, or True Keihin PWK jetting. I tried 45 pilot and had to turn the air screw out 4+ turns out (very rich) but the bike loved it, but rich. I've been going down in size to currently a 38 which is around 2 turns out but the bike stumbles when I blip the throttle. I'm thinking a 40 might be the sweet spot. How far out on the air screw is acceptable? Needle is is in the 4th from the top, I'm going to put it back in the middle and continue tuning. I'm at 761ft above sea level. All trail riding. https://www.aliexpress.com/item/3284...27424c4dAc5IIl |
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#2 | |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,664
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Quote:
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2024 Linhai 300 ATV 4x4 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: Sep 2016
Posts: 103
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Quote:
Do you have the same carb? 120 main sounds about right, I ported the intake path to match the carb opening and have a open style air filter, free flowing exhaust. Other than that it's stock. So I'm guessing I'm on the right path. Maybe a 35 Keihin pilot might be worth a try. How many turns is your air/fuel about and what is your needle clip on? I'm just trying to reference to ball park mine? I'm shooting for 1.5~2 air screw, sound about right? |
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#4 | |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,664
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Quote:
__________________
2024 Linhai 300 ATV 4x4 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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#5 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,664
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Did you port the exhaust side? I know on my Hawk it was very restrictive. Big improvement.
__________________
2024 Linhai 300 ATV 4x4 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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#6 | |
Join Date: Sep 2016
Posts: 103
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Quote:
Not yet, it's a winter or next summer project but I can see it's very restrictive. I'm using a stock 2005 CRF250X exhaust with the silencer removed. |
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#7 | |
Join Date: Sep 2016
Posts: 103
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Quote:
What size did you end up buying? The 30mm? The manufacturer says all the slide sizes are the same and if you get a rich idle circuit that can't be fixed with jetting you need to go up a size in carb. I wonder if the 30mm I bought is too small going by their size/HP CC charts. |
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#8 | |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,664
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Quote:
__________________
2024 Linhai 300 ATV 4x4 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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#9 | |
Join Date: Aug 2019
Posts: 4
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rich idle circuit that can't be fixed with jetting you need to go up a size in carb?
Quote:
hi there, i'm confused (not difficult!) i would have thought that if the rich idle cannot be fixed by jetting a bigger carb would be even richer? i have the same zong 230 crf clone engine and i put a pwk32 on it but it was way too rich in idle and i couldn't jet it down enough. all the posts on the crf230 forum say a pwk28 is perfect for the stock engine. apologies if i am talking rubbish - anyone put me right on this? thanks. |
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#10 |
Join Date: Mar 2024
Posts: 2
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Recently I purchased a Templar 250 Pro. Ran great but had rapid backfire on deceration, and the exhaustpipe was blue. Carb was unservicable, so I inquired to X-Pro and they sent me a new one. Did the same thing. Stock jets were 110/30, changed to 120/40 and it was way better,accept the idle had to be over 2k. Ordered a Kehin 30 and jetted 140/50 and no deceleration backfire. I do have an intermittent light popping in the exhaust at idle (1500 rpm) with no performance issues. I still can't figure out why when cold there is a idle increase for a bit.
I am riding at 4000 feet elevation, so.... |
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#11 | |
Join Date: Aug 2009
Posts: 552
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Quote:
Possibly an air leak at the head/manifold or carb/manifold that goes away when the parts heat up and swell. |
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