Brozz 250 - PE30 Carb and Intake Options

[tknj99]

Hi All,

The next plan for my Brozz is to look into the PE30 carb. I currently have the stock PZ30 with a 120main installed. After reading about the amazing gains some have reported (after porting the head) by switching from stock to PE30 carb, i am sold. My question is around whether i can still retain the stock airbox or whether i will be forced to use a pod filter.
If i can retain the stock airbox, how would the connection work. I know the PE30 will need a new angled intake manifold and i will look for the shortest one i can find. Could the rubber intake piece that connected to the airbox work to connect to the PE30 at that point?
If not, what options are their to retain the stock airbox? Possibly some kind of pvc pipe fitting between the carb running behind the frame into the airbox?
I have seen one pic where the PE30 had a pod filter attached but it was on the outside of the frame and id rather it be tucked in and clean.
If i have to go pod filter, what fiter will allow it to be connected to the carb and then still be tucked in behind the frame to render a clean look with also some level of protection from dirt/etc

Any help is greatly appreciated. thanks

I'm looking at these for purchase:
https://www.amazon.com/gp/product/B0...72KG178U&psc=1
https://www.amazon.com/dp/B07S2YSHR1...dDbGljaz10cnVl

[alex_in_az]

that intake wouldn't work on my TBR7, I ended up using a CRF230F manifold with a 3D printed spacer to get everything to line up. Honestly, I'm not seeing much of a gain in performance over the stock VM26

[tknj99]

Originally Posted by alex_in_az

that intake wouldn't work on my TBR7, I ended up using a CRF230F manifold with a 3D printed spacer to get everything to line up. Honestly, I'm not seeing much of a gain in performance over the stock VM26

Thanks for that info.. i read Megadan and JerryHawk i believe make the comment that when stock there may not be much gain with the PE30 but when the head is ported/polished there was a large gain going from stock carb to PE30. Interesting that you noticed no significant gain, if thats the case id rather just stick with stock carb and stock intake modified

[gwowzer]

I noticed a good gain when I switched from stock to PE30 on the Brozz w/ exhaust and air pod. Problem is getting the idle just right. It has moods day to day. I imagine with a head port and polish this would go away.
When I tear down the bike this winter I am going to explore going back to the air box/stock filter set up, or try to figure out how to pipe the pod into the air box.

[gwowzer]

I'm actually going to go to a PE28 for the time being and set the PE30 aside until/if I do the head work.

[brianjmt]

I think you do better with a nippi 28. much easier to tune and looks cool too.

[Megadan]

There is definitely a gain in the throttle response and power in the mid range and upper RPMs. The issue with the PE and PWK30 is that they are just a tad on the large side for a CG250, even with head work. It took me quite a while to get my jetting sorted out. The PE28 is actually a better match to these engines, even with mods.

Is the gain worth it? That is subjective. I have a lot of experience with carburetors, so the hassel of getting it dialed in is no sweat off my back. The VM26 is still my number 1 carb recommendation for 90% of the bikes on this forum though, and for good reason. It just works, and it works well. I would have zero issue putting a VM26 back on my bike right now.

The downsides to the PWK/PE carbs are numerous. The intake being one of the biggest issues. Due to variations in frame construction, some intakes just wont work. Other intakes that are longer like mine, cause other fitment issues that have to be resolved.

Can you make it work with the stock airbox? Absolutely. BUT, you will need to do a little DIY fabrication. The inlet size on the PE/PWK is much bigger, so the original tube will not work, plus the different intake will change position of the carb.

[tknj99]

So if the PE30 is problematic and finicky as you've noted and ive also seen in some other threads, is there any alternative to the PZ30 that i currently have that will be the recommended smooth bore 30mm type that might yield a performance gain yet be easier to live with and less temperamental?
Or should i stick with the PZ30 and just hook up a foam filter to it for whatever gain that will yield with the ported head?

Thanks

[XLsior]

Considering a chinsy foam filter uni knock off is like $3 or USA unifilter is maybe $6 its worth trying out before throwing money at carbs. Keihin jet kit is about $3 while you're at it looking for foam filter

Making small incremental gains isn't always noticed however you need to do about 80% effort to notice the %20 difference, but worse is over compensating for no gains whatsoever.

[TxTaoRider]

I suppose that I'm going to sound dumb for pointing this out, but I'm pretty sure a Honda crf230f makes every bit as much power as our bikes, in fact, more power than ours. They use a 26mm carb I believe. That being the case, I can't see we need much more than that even on a pretty heavy modded bike. I'd think the stock 30mm is way more than needed.
Just thinking out loud...

[tknj99]

So i took the plunge and ordered the following 3 items:

Carb: I went with this one instead of the black Nibbi knockoff that i linked to earlier in the thread as its unavailable on Amazon.. Ebay has it but id rather do Amazon for speed of delivery and returnable.
This carb is exactly the same as the Nibbi and knockoff versions except its gray metal finish vs black. Also it has that chimney outlet that i think needs to be plugged up unless its an up/down enrichment circuit, not sure yet,tbd
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Carb manifold:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Intake:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

As always, will do a review once i install them.. worst case if the carb winds up being problematic ill return it and just stick with the air filter pod

[Megadan]

Originally Posted by TxTaoRider

I suppose that I'm going to sound dumb for pointing this out, but I'm pretty sure a Honda crf230f makes every bit as much power as our bikes, in fact, more power than ours. They use a 26mm carb I believe. That being the case, I can't see we need much more than that even on a pretty heavy modded bike. I'd think the stock 30mm is way more than needed.
Just thinking out loud...

A very common performance upgrade for the CRF230F when doing ported heads, cams, and bigger bore cylinders is to swap over to an XR250R carburetor, which is a 30mm bore version of the same carburetor.

[China Rider 27]

Originally Posted by tknj99

So i took the plunge and ordered the following 3 items:

Carb: I went with this one instead of the black Nibbi knockoff that i linked to earlier in the thread as its unavailable on Amazon.. Ebay has it but id rather do Amazon for speed of delivery and returnable.
This carb is exactly the same as the Nibbi and knockoff versions except its gray metal finish vs black. Also it has that chimney outlet that i think needs to be plugged up unless its an up/down enrichment circuit, not sure yet,tbd
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Carb manifold:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Intake:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

As always, will do a review once i install them.. worst case if the carb winds up being problematic ill return it and just stick with the air filter pod

That carb you ordered looks to be the same carburetor, PE 30, I put on my Magician. Appears there are several sellers selling the same carb, and most likely getting them from the same manufacture. You can buy that carb for $26.00 on ebay and save yourself some money. It does not spec 30mm but 28.5...thereabouts. The 30mm carbs I have measured usually spec at 29mm plus so to me that carb is 28mm. You are going to need a manual choke lever, that weird rubber duhicky is for a cable choke. And that seller I have had issues with on returns.

[Megadan]

The carbs measuring under their actual stated diameter isn't unusual. My Nibbi PE30 measures 29.6mm at the throat closest to the engine. Much like many engines are rounded up to a "nominal" measure. aka a 2.0L may actually be 1984cc.

Honestly, those cheaper PE carbs measuring closer to 28mm will be advantageous.

[tknj99]

Originally Posted by China Rider 27

That carb you ordered looks to be the same carburetor, PE 30, I put on my Magician. Appears there are several sellers selling the same carb, and most likely getting them from the same manufacture. You can buy that carb for $26.00 on ebay and save yourself some money. It does not spec 30mm but 28.5...thereabouts. The 30mm carbs I have measured usually spec at 29mm plus so to me that carb is 28mm. You are going to need a manual choke lever, that weird rubber duhicky is for a cable choke. And that seller I have had issues with on returns.

Thanks for that info.. yes i did find cheaper options as well on Ebay but very long ship times from China and find Amazon returns much easier generally.
Can you elaborate please on that cable choke duhicky.. do you know where i can get that choke lever? or can i use it as is without the use of a choke?
if so, does it need to be capped off or anything? thanks