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Post by laz231 on Dec 27, 2019 17:36:03 GMT -5
Hey i read up on whats been written on here most like dellortto i like the mikuni but real mikuni's are 24 and larger . I got a zptp 21 clone i was gonna use on my pit bike but it looks cheap as hell . I know polini and a few other sell them but i rather have a real one is there a 21 mm option like a real oko anyone use a certain brand that worked for them .
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Post by ThomasTPFL on Dec 27, 2019 17:53:05 GMT -5
Dellorto PHBG are easy to come by and pretty straight forward to tune. Make sure it has the 2t atomizer.
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Post by laz231 on Dec 27, 2019 18:52:41 GMT -5
Thanks i was leaning towards the flat slide but i guess the dellortto is good on this application im look into one
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21mm carb
Dec 28, 2019 8:39:23 GMT -5
via mobile
Post by ryan_ott on Dec 28, 2019 8:39:23 GMT -5
I like the Dellorto PHBG carbs because they are very tunable, perform well and you can get decent fuel economy from them. I found in the past that the smaller PWK style carbs were more difficult to tune compared to the larger sizes and they are usually more thirsty.
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Post by Zino on Dec 28, 2019 10:32:03 GMT -5
17.5 mm dellorto are great sport build 70cc and below .
19 mm dellorto are great for mid race and below builds.
21mm Dellorto Mid race and Above .
There is some overlap between carbs . So plan on where you are going to end up in your wildest dreams and work backwards.
Dellortos have easy to find jets and needles from mutiple vendors .
The longer I do this the more I have realized I need to have multiple reliable sources for parts .
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Post by laz231 on Dec 28, 2019 10:32:49 GMT -5
i got a 21 pwk so im gonna get a delloroto 21 so i can test back to back mileage isnt a problem we got a hellcat challenger that burns e85 it gets a whopping 7 mpg
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Post by laz231 on Dec 28, 2019 10:35:54 GMT -5
i got a jetting drill kit i use for trackside tunning a pin vise and all the drills once you get the jetting right you can use the number jet you need this way you use one jet for tunning
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Post by laz231 on Jan 13, 2020 11:20:53 GMT -5
Has anyone tried the oko carb with a powerjet i know it dont stick in the middle of the air path but i have read it works well on 2 strokes . I know most like the dellorto i ran one way back on my puch in the 80s and 48 ida on a vw bug i deal with the mikuni style the thing is real ones don't have the power jet oko do seems easier to jet wide open .
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Post by repherence2 on Jan 13, 2020 21:19:45 GMT -5
Has anyone tried the oko carb with a powerjet i know it dont stick in the middle of the air path but i have read it works well on 2 strokes . I know most like the dellorto i ran one way back on my puch in the 80s and 48 ida on a vw bug i deal with the mikuni style the thing is real ones don't have the power jet oko do seems easier to jet wide open . I ran a clone 26 OKO with power jet. It can be a pain to tune it. While doing research on it, i found on other forums that most people block off the fuel line going to the power jet with a small BB to disable it. I was too hard headed to give up so i persisted until i figured it out. Normally, i tune for Wide Open Throttle and i tune by cylinder head temperature, no plug chops for me. I dont read plugs. I use temperature to dictate my Main Jet and i tune for a temp of 350° F at WOT. That allows me to hold WOT all day without worrying about seizing the piston. A carb with a Power Jet, your main jet is used for 3/4 to 7/8 throttle. Past 7/8 throttle, the Power Jet comes online. So when you tune with a power jet carb you have to keep in mind that at WOT, 2 jets, the Main and the Power jet are providing fuel. It was a massive headache until i understood how it worked. A 26mm carb with a Power Jet will use a smaller main jet when compared to a 26mm carb (no power jet) on the same engine set up. I recommend tuning with a Cylinder Head Temp gage so you can see how its running. When tuned right, you will notice when the Power Jet comes online via the CHT gage. You will see a small drop in temperature when you transition from 3/4 throttle to WOT. Just so you know, Tuning a wide open (no airbox, no filter) pwk carb with power jet can be a nightmare.
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Post by laz231 on Jan 14, 2020 9:57:10 GMT -5
Ok im not new to tuning i been working with 2 strokes since the 80s . I tune race cars carbed nitrous turbos i also have small engine experience i can figure out how to fuel the engine . What i learned from racing is a 2 stroke that is properly tuned will seize if you run it wide open for 2 long if you richen it will not stick the piston but be slower (a friend raced super bikes in daytona he outran the factory teams )we have better oil and better technology these days . The reason i ask about the carb is all alky 2 strokes run powerjet if it didnt work no one would use it , so im leaning towards it but they dont make real mikuni 21mm with a powerjet i have a cheap clone one but i dont wanna use it ?
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21mm carb
Jan 14, 2020 10:35:10 GMT -5
via mobile
Post by repherence2 on Jan 14, 2020 10:35:10 GMT -5
Being that you are familiar with tuning, i think you should try it.
It might give you the performance that you are looking for. Also, for someone like you, tuning that carb might be super easy.
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Post by dexameth on Jan 14, 2020 11:34:07 GMT -5
I was thinking of running the 19 or 21 OKO with power jet on my 70cc Minarelli clone (once it's installed). I only have 2 21mm with powerjet left in stock right now... find them here. I think it will play nicely with the performance intake w/ carbon reeds... we'll see!
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Post by laz231 on Jan 14, 2020 19:30:49 GMT -5
do it and give some feedback i will buy 2
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Post by laz231 on Jan 18, 2020 21:04:03 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
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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21mm carb
Feb 1, 2020 15:24:33 GMT -5
via mobile
Post by mattyslimz on Feb 1, 2020 15:24:33 GMT -5
I too was looking at the Polini CP (in 19mm size) for a sport/midrace build 1e40qmb. Though I need to do some more research on its connections because I’d still like to retain the oil injection line and vacuum. If I’m not mistaken, the auto E-choke will have to disappear if going the CP route. I’ve heard only great things on these carbs and look to be very well made. I need a replacement for the junk PZ19 2stroke carb which seems to be a bigger version of what usually comes stock on these scoots which is a Mikuni or clone Mikuni VM16. I’ve seen the Amazon/EBay/Ali based PZ19 on everything from pitbikes to mini quads. Reason I’m leaning towards the CP is that the float on my PZ19 constantly sticks, sometimes I’ll get it corrected and just a small bump in the road will make it start overflowing again. The gaskets are junk and carb is just plain lousy.
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