PWK 30mm or PZ30 pumper ? - Page 2

**JerryHawk250** · 03-09-2020, 09:08 AM

Quote:

Originally Posted by Megadan

That one has something that I have noticed is common with the cheaper PE30 carbs, which is that hose barb fitting on the back side of the carb. It will need to be blocked with a vacuum cap if it is open to the atmosphere to the bore of the carb or it will be one heck of a vacuum leak. The Nibbi has that part of the casting close off. No idea why they do it, nor is it a big deal, just something I noticed.

I noticed that too. No big deal.

**JerryHawk250** · 03-09-2020, 09:11 AM

Quote:

Originally Posted by China Rider 27

Before we all go out and retire our PZ30, 30B, Mikuni in favor of the smooth bore we should consider what we are trying to achieve. Stands to reason that a PE28 or PE30 or PWK30 could be adjusted to run well on a stock engine AND you get the prize of side idle mixture adjustment which alone may justify its use provided the overall function is good. Top speed aside, then seems we are talking about the best acceleration between the carburetors and low speed torque and drive ability. Another consideration would be fuel mileage in relation to performance increase. As far as a stock motor, until we have evidence of how a smooth bore works on a stock engine we have not really established if there is substantial improvement to justify its use. And then how easy is it to tune a PE30 or PWK30?

I'll probably install the PE30 on my new bike before doing the head work just to see if there are any improvements on a stock engine. The PZ30 pumper carb is performing well on the new bike.

China Rider 27 · 03-09-2020, 09:09 PM

Thanks Dan and Jerry for the input. You guys have the smooth bore experience. I got a PWK 30 several months ago and am working out the manifold, I am going to try it out on a unported head setup too but gonna be awhile. I had it apart yesterday and works no different changing the jets and it has an idle speed and mixture screw same as the others. I like my PZ30b too but the thing about these China Bikes is once you do a mod and get a little performance improvement you can't stop! lol

03-09-2020, 09:09 PM	#18
China Rider 27 Join Date: Dec 2018 Location: PNW Posts: 982	Thanks Dan and Jerry for the input. You guys have the smooth bore experience. I got a PWK 30 several months ago and am working out the manifold, I am going to try it out on a unported head setup too but gonna be awhile. I had it apart yesterday and works no different changing the jets and it has an idle speed and mixture screw same as the others. I like my PZ30b too but the thing about these China Bikes is once you do a mod and get a little performance improvement you can't stop! lol
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