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Post by laz231 on Feb 1, 2020 19:05:35 GMT -5
well i still been doing research what i come up with is all the 21mm pwk are clones of a mikuni i for one dont like copies i rather buy the real deal they dont make a 21 mikuni so the best quality clone is the swr they have a iso9001 certificate . I got a clone one and a oko one with power jet i will post a pic once im done with them
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21mm carb
Feb 3, 2020 10:21:51 GMT -5
via mobile
Post by repherence2 on Feb 3, 2020 10:21:51 GMT -5
well i need a carb cant wait dellorto 21 or cheap pwk i got one already but was thinking a polini cp tell me which one and why 70 mid race build I ran a Polini CP 24 on a minarelli Motoforce mid race 70. It's an excellent carb. It does not use as much fuel as a PWK. The low/mid range is a lot better than the big PWKs. I like the big PWK for top end WOT. It just flows better when running Wide Open Throttle.
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Post by dexameth on Feb 3, 2020 10:33:58 GMT -5
I just got the 21mm OKO with powerjet installed. Hoca Ceramic 70cc kit, SSP-G performance intake w/ carbon fiber reeds and a UNI filter on the carb. I went from the 103 main jet down to a 98, and had to move the needle clip from the second to last spot up to the 2nd to top (more lean).
SHE FUGGIN RIPS! WAY WAY WAY more power than before. RPMs are higher too, I am screaming at 10k at WOT. 55mph top speed so far...
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Post by 808ministroke on Feb 14, 2020 19:43:00 GMT -5
I am running a polini cp 23 mm ( they make 17.5,19,21,23) on a s6 street race with a phongeer 100cc sport pipe and compared to the 28 oko ran on the same setup I can tell you that indeed CPI are way more fuel efficient that is not why I like them though. With a cp you have so much more control over various throttle positions with a pwk it’s kinda like on or off with a cp round slide it’s more like you have a dimmer switch and have more control over exact speed without letting off throttle.
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Post by repherence2 on Feb 14, 2020 21:02:32 GMT -5
I am running a polini cp 23 mm ( they make 17.5,19,21,23) on a s6 street race with a phongeer 100cc sport pipe and compared to the 28 oko ran on the same setup I can tell you that indeed CPI are way more fuel efficient that is not why I like them though. With a cp you have so much more control over various throttle positions with a pwk it’s kinda like on or off with a cp round slide it’s more like you have a dimmer switch and have more control over exact speed without letting off throttle. Running large OKO carbs wide open results in poor low-mid throttle control. And yes, the CP is a lot better at low-mid throttle performance. The moment you install a venturi divider in the OKO carb mouth, the game changes drastically. Low-mid range throttle tuning becomes so much easier. It gives you the low throttle driveability of the CP but the wide open throttle performance of the large OKO.
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Post by benji on Feb 14, 2020 21:09:21 GMT -5
I am running a polini cp 23 mm ( they make 17.5,19,21,23) on a s6 street race with a phongeer 100cc sport pipe and compared to the 28 oko ran on the same setup I can tell you that indeed CPI are way more fuel efficient that is not why I like them though. With a cp you have so much more control over various throttle positions with a pwk it’s kinda like on or off with a cp round slide it’s more like you have a dimmer switch and have more control over exact speed without letting off throttle. Running large OKO carbs wide open results in poor low-mid throttle control. And yes, the CP is a lot better at low-mid throttle performance. The moment you install a venturi divider in the OKO carb mouth, the game changes drastically. Low-mid range throttle tuning becomes so much easier. It gives you the low throttle driveability of the CP but the wide open throttle performance of the large OKO. This is so true. A 28mm carb and a pipe meant for a 100cc bore is a recipe for poor performance (all around). Also, anytime you go down to a smaller carb, you're going to get better fuel efficiency. Pwk carbs are the best 2t racing carbs available IMO.
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Feb 15, 2020 14:58:07 GMT -5
Good info on this thread. I guess I have my mind made up on the CP19. This PZ19 junk has to go. One things for sure, the PWKs with power jet or not are a nightmare in my opinion to tune. The CP will go on my Chinerelli and the 21 PWK from Stage 6 on my Zuma looks to be a clone of a Keihin only with softer quality metal. I wish Keihin made genuine carbs in smaller sizes 17.5,19,21 etc.
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Post by laz231 on Feb 15, 2020 22:39:59 GMT -5
whats a venturi divider you got a pic or link
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Post by 808ministroke on Feb 18, 2020 4:53:06 GMT -5
The Venturi divider is something I have only seen on photos of rephrence’s build. It is basically a bell mouth with a thin piece of metal flat kind in the middle of the carb mouth opening. I wants know we’re you got that reph can you get me one on Oahu never seen em anywhere else I want to try it out and see what you are talking about.....
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Post by 808ministroke on Feb 18, 2020 4:59:56 GMT -5
Oh and I was surprised myself when I got it and realized it was a 28 not a 24 oko open no filter and it was the most silent sleeper I ever had. I have since switched the carb obviously but 5mm smaller and I added a foam filter. The mj in the. Oko I believe was130,! But also changed the boar to one that likes to rev higher....oh and I added a light racing clutch that made a big difference in sound is louder but it pulls wheelies alll day
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Post by dexameth on Feb 18, 2020 8:58:54 GMT -5
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Post by laz231 on Feb 18, 2020 9:34:31 GMT -5
you your saying a tornado is the hot ticket lol
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Post by dexameth on Feb 19, 2020 9:01:16 GMT -5
you your saying a tornado is the hot ticket lol No, not at all haha! You do have the right idea though, as a tornado creates high speed air movement, although it's very very turbulent. These dividers are meant to knock the turbulence down, creating a more uniform air flow which in turn atomized the fuel better and gives the engine a more constant power. Kinda the same reason why bike bike manufacturers are studying the airbox design better - a large volume air box directly connected to the throttle body/carburetor with minimal tubing between the two is optimal. Very little turbulence, lots of air volume to deliver, I've thought about trying to get a small 70° bend tube to run from the carb right up to the seat bucket and use the seat bucket as the air box.
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21mm carb
Feb 19, 2020 10:30:45 GMT -5
via mobile
Post by repherence2 on Feb 19, 2020 10:30:45 GMT -5
The Venturi divider is something I have only seen on photos of rephrence’s build. It is basically a bell mouth with a thin piece of metal flat kind in the middle of the carb mouth opening. I wants know we’re you got that reph can you get me one on Oahu never seen em anywhere else I want to try it out and see what you are talking about..... I made it from aluminum plate about 1/16" thick. Made a pattern from manila card stock. Traced it onto the aluminum. Most of the contour shaping was done with a 1/2 round file. Im going to make more plates soon. Next version will be criss cross like the Boyesen version but im going to make a criss cross insert for the portion behind the slide too.
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Post by laz231 on Feb 19, 2020 10:48:02 GMT -5
ok i get it im make one and post it soon i got 3 21mm now i can play musical carbs once the motors built
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