Go Back   ChinaRiders Forums > Technical/Performance > Pure Dirt
Register FAQ Community Calendar Today's Posts Search
Reply
 
Thread Tools Search this Thread Display Modes
Old 07-31-2019, 01:57 PM   #1
crackerjac   crackerjac is offline
 
Join Date: Sep 2016
Posts: 104
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


 
Reply With Quote
Old 07-31-2019, 02:04 PM   #2
JerryHawk250   JerryHawk250 is offline
Moderator
 
JerryHawk250's Avatar
 
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,721
Quote:
Originally Posted by crackerjac View Post
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
I'm currently running a 38 pilot and 125 main but my head is ported and decked. 120 might be better suited for stock engine. They use Keihin style jets.
__________________
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


 
Reply With Quote
Old 07-31-2019, 02:10 PM   #3
crackerjac   crackerjac is offline
 
Join Date: Sep 2016
Posts: 104
Quote:
Originally Posted by JerryHawk250 View Post
I'm currently running a 38 pilot and 125 main but my head is ported and decked. 120 might be better suited for stock engine. They use Keihin style jets.

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?


 
Reply With Quote
Old 07-31-2019, 02:13 PM   #4
JerryHawk250   JerryHawk250 is offline
Moderator
 
JerryHawk250's Avatar
 
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,721
Quote:
Originally Posted by crackerjac View Post
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?
I have this carb but tuning should be close to the same.https://www.aliexpress.com/item/3237...16894c4dabE24C I'm at 1 1/2 turns out and needle raise one notch from center.
__________________
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


 
Reply With Quote
Old 07-31-2019, 02:18 PM   #5
JerryHawk250   JerryHawk250 is offline
Moderator
 
JerryHawk250's Avatar
 
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,721
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


 
Reply With Quote
Old 07-31-2019, 02:21 PM   #6
crackerjac   crackerjac is offline
 
Join Date: Sep 2016
Posts: 104
Quote:
Originally Posted by JerryHawk250 View Post
Did you port the exhaust side? I know on my Hawk it was very restrictive. Big improvement.



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.


 
Reply With Quote
Old 07-31-2019, 02:23 PM   #7
crackerjac   crackerjac is offline
 
Join Date: Sep 2016
Posts: 104
Quote:
Originally Posted by JerryHawk250 View Post
I have this carb but tuning should be close to the same.https://www.aliexpress.com/item/3237...16894c4dabE24C I'm at 1 1/2 turns out and needle raise one notch from center.

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.


 
Reply With Quote
Old 07-31-2019, 02:25 PM   #8
JerryHawk250   JerryHawk250 is offline
Moderator
 
JerryHawk250's Avatar
 
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,721
Quote:
Originally Posted by crackerjac View Post
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.
I got he 30mm. I think 30mm smooth bore is perfect for these engines.
__________________
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


 
Reply With Quote
Old 07-31-2019, 02:32 PM   #9
crackerjac   crackerjac is offline
 
Join Date: Sep 2016
Posts: 104
Quote:
Originally Posted by JerryHawk250 View Post
I got he 30mm. I think 30mm smooth bore is perfect for these engines.



Out of curiosity, what did you set your float height at? I know the proper way is to use a tube off the float bowl but there is no nipple on these so unless I get another cap for the bottom and drill and tap a fitting to do the tube method I just followed the OKO sites method and set it to 21mm, which appears to be a similar carb.



http://www.mid-atlantictrials.com/Instal.html


 
Reply With Quote
Old 07-31-2019, 02:38 PM   #10
JerryHawk250   JerryHawk250 is offline
Moderator
 
JerryHawk250's Avatar
 
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,721
Quote:
Originally Posted by crackerjac View Post
Out of curiosity, what did you set your float height at? I know the proper way is to use a tube off the float bowl but there is no nipple on these so unless I get another cap for the bottom and drill and tap a fitting to do the tube method I just followed the OKO sites method and set it to 21mm, which appears to be a similar carb.



http://www.mid-atlantictrials.com/Instal.html
I just turned the carb upside down and made sure the seam of the float was parallel with the carb body.
__________________
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


 
Reply With Quote
Old 06-03-2020, 06:39 PM   #11
crackerjac   crackerjac is offline
 
Join Date: Sep 2016
Posts: 104
Resurrecting an old thread.


I notice the CRF230 guys running 120/45 for jetting but that's on a true PWK28. These aftermarket units I can't say.


I went with this one, 30mm, comes with 125/38 for jetting. I'm wondering if the 120/45 is the way to go. Thoughts?


Note this one doesn't have the power jet like yours does.


https://www.aliexpress.com/item/1000...archweb201603_


 
Reply With Quote
Old 12-31-2020, 08:52 AM   #12
el-griffo   el-griffo is offline
 
Join Date: Aug 2019
Posts: 4
rich idle circuit that can't be fixed with jetting you need to go up a size in carb?

Quote:
Originally Posted by crackerjac View Post
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.

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.


 
Reply With Quote
Old 12-31-2020, 09:17 AM   #13
JerryHawk250   JerryHawk250 is offline
Moderator
 
JerryHawk250's Avatar
 
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,721
Quote:
Originally Posted by el-griffo View Post
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.
A pwk32 is way too big a carb for the stock engine. The pwk28 is a perfect match. I'm using a PWK30 on my Venom X22R but also have ported the head and 11:1 compression. Bigger is not always better.
__________________
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


 
Reply With Quote
Old 03-23-2024, 01:54 PM   #14
D-Gas_Bob   D-Gas_Bob is offline
 
Join Date: Mar 2024
Posts: 2
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....


 
Reply With Quote
Old 03-23-2024, 03:47 PM   #15
dirtbkr188   dirtbkr188 is online now
 
dirtbkr188's Avatar
 
Join Date: Aug 2009
Posts: 576
Quote:
Originally Posted by D-Gas_Bob
I still can't figure out why when cold there is a idle increase for a bit.

Possibly an air leak at the head/manifold or carb/manifold that goes away when the parts heat up and swell.


 
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 02:03 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.