Recommended jetting?

[crackerjac]

Originally Posted by JerryHawk250

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.

[JerryHawk250]

Originally Posted by crackerjac

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.

[crackerjac]

Originally Posted by JerryHawk250

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

[JerryHawk250]

Originally Posted by crackerjac

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.

[crackerjac]

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_

[el-griffo]

Originally Posted by crackerjac

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.

[JerryHawk250]

Originally Posted by el-griffo

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.