Nibbi Racing PE30.

[Megadan]

EDIT: Final Jetting for my bike with head porting is a 35 pilot. 135 main (132 in hot summer weather, 140 when temps dip below 50) and 1 7/8 turns out on the idle mixture (excluding adjustments for cold or hot weather extremes).

Since there seems to be a growing interest in this brand of carburetor, I figured I would go over the PE30 that I ordered in some greater detail. Below will be a video I made on said carburetor, but first I would like to say that, even though this carburetor is a much higher quality than the typical Chinese clone variety most of us buy you will still want to do what I did and take the carb down completely and clean it out. I found swarf and even some flecks of aluminum in the slide bore and from the bowl, passages, and carb body in general when I cleaned it. Do your due diligence and avoid potential headaches and damage.

Tomorrow I plan on installing and getting this carb jetting dialed in and I will try to record some of it in the process. I will then report on what jetting worked best for me and my thoughts on sizing for a non ported head CG250 may work well.

Now, on to the video!

[JerryHawk250]

Wow! That's nice and pretty. Now that's high quality there.

[Douglass]

Greatly appreciated Dan!

[Douglass]

Dan, assuming the PWK30 carb was a Nibbi, would it be a better carb than the PE30? I was emailing the seller on amazon about the PE30, and he suggested to use the Nibbi PWK30 instead for the Apollo. I like the looks of the PWK30, but don't want to throw money at something ether. The intake/exhaust is still stock on the bike, with no current plans to modify it.

[JerryHawk250]

Originally Posted by Douglass

Dan, assuming the PWK30 carb was a Nibbi, would it be a better carb than the PE30? I was emailing the seller on amazon about the PE30, and he suggested to use the Nibbi PWK30 instead for the Apollo. I like the looks of the PWK30, but don't want to throw money at something ether. The intake/exhaust is still stock on the bike, with no current plans to modify it.

The PWK30 will probably better for the Apollo because you will have easier access to the idle mixture and idle speed screw being that your carb angles to the left side of the bike whereas the Hawk angles to the right side of the bike.

[Megadan]

Originally Posted by JerryHawk250

The PWK30 will probably better for the Apollo because you will have easier access to the idle mixture and idle speed screw being that your carb angles to the left side of the bike whereas the Hawk angles to the right side of the bike.

This is probably a big one. For the same reason I chose to go with the PE30, you would be better off with a PWK, otherwise reaching the adjustments would prove to be a pain in the rear.

Performance wise there won't be much between them, although the PWK will have slightly better throttle response due to its slide type.

[Megadan]

So, I got it installed. Good news is, any PZ30/VM26 clone cable will also work on this. I had to use the CQR intake, but it does work perfectly. Having the idle mixture and idle speed adjustment right there on the side is a HUGE convenience.



Bad news for me, the shorter intake was again a no go. I am going to assume that since I have a non factory head, the intake angle was machined more shallow than the Hawks. This is the same fitment issue I have had with the "angled carb adapters"




So with the 48 pilot installed it started right up, but it needs alost 3 turns out to hold a semi-steady idle, so the 48 is too rich, and the black smoke from the muffler when I blip it would agree. That said, it isn't too far off either, because when it was dead cold it idled great, and tapered off once it warmed up. Almost like running with the choke on. It would seem they were not kidding when they said it was a high velocity carb lol. Once the bike cools off a little more I am going to jump down to the 40 they included with it and see how that does.

Some research I did confirms this as well. More powerful 250's that came with a PE30 stock are using a 50 pilot jet.

[OneLeggedRider]

That's purdee! Will your side cover still go back on? And how much for the carb and intake?

[Megadan]

Originally Posted by OneLeggedRider

That's purdee! Will your side cover still go back on? And how much for the carb and intake?

The carb is 80 bucks (a bit ouch) on Amazon. There are cheaper knock offs of the PE30 on aliexpress if that price makes your wallet cringe. About the same price range as most of the cheap PWK's 25-35 bucks.


The jetting adventure continues. Putting the 40 pilot in definitely made an improvement. No more soot volcano and I was able to find a steady idle at a hair over 3 turns out. I am going to try a 35 next to see if that gets me at least near 2 turns out on the air screw. If needed I have a 32 if the 35 still proves to be too much, but I think it will be the ticket.. Talking with a TT250 owner that has a PWK on his bike, he ended up with a 30 pilot with the air screw about 1 1/2 to 1 3/4 turns out

I am thinking that the longer CQR intake is affecting the vacuum on the carb and pulling a lot harder on the jets requiring me to run smaller sizes than I would think I would need. The intake pulses are so strong it even rattles the round slide around a bit.

Once I had the mixture somewhat close I gave it a rev and at wide open it immediately cut out. So the 130 might be too big, but given that the pilot is still on the large side I am going to wait to change the main until I know the pilot circuit is right.

[JerryHawk250]

A 38 or 39 pilot will probably do. I played around with mine over the weekend. I tried a 41 and was way too rich. with the 39 I was at 1 1/2 turns out. I had a 125 main in for the winter and with the temps now in the 90's it was on the rich side. I tried a 120 and was a little lean. I need to order a 122 and should get me about right.

[Megadan]

So, since my work schedule is changing i have today off and thought I would tinker around a bit more.

Tried a 38 pilot. Still a bit too rich, but less than 3 turns out.

32 pilot, does work, air screw 1 1/4 out, but too lean.

35 pilot, just about right. I still have to play with it, but air screw is between 1 1/2 and 2 turns out.

Swapped the main down to a 125. Doesn't cut out but still bogs and throws lots of soot. 120 is next.

I can definitely say that there is a lot more draw on the jets with this carb vs. the pz30.

[Megadan]

Ok, so 35 pilot, air screw about 1 7/8 turns out seems to be the ticket. 120 main and the black soot cloud is gone. I left the needle in the third notch, but I need to ride it to get a good feel. Going to spend time with my better half now, so no runs just yet, but if I have some free time tonight I will take it for a rip.

[JerryHawk250]

It's gotten pretty hot here and was getting a little off throttle bogging. I swapped out my pilot to a 38 yeasterday and so much crisper throttle response. Still running 125 main. 120 was a little lean.

[GronkFries]

Originally Posted by OneLeggedRider

Will your side cover still go back on?

I was going to let it go until I noticed this comment lol. Well does it?

And the idle knob is pretty sweet, that is a worthwhile invention right there. If it's only one carb might as well have a air/fuel mixture screw knob too.

[Megadan]

Ok, so even though I mention it in the video. My magic jetting numbers at this point are a 35 pilot and a 130 main jet.

This bike pulls like I never imagined a Hawk with tall gearing could ever pull. The difference in power even all the way down at just off idle compared to my PZ30B is incredible. I can roll on at 3000rpm in 3rd and the bike just pulls like a train, and it doesn't even feel like it is being lugged at all. The fact that I can FEEL the difference says a lot. Having just ridden it yesterday with the PZ30B installed, in almost identical weather, I can say for sure it is not in my head and that the PZ30 was holding me back.

I think at this point the only other upgrade I could do to improve my performance would be a cam upgrade.

Would this be a good upgrade for a standard CG250? Honestly, I bet it would make a difference. If you plan on porting your head, definitely upgrade to a 30mm smooth bore.