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Post by hippo008 on Sept 10, 2021 16:34:00 GMT -5
  New panels and decals finally came in. |
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Post by aeroxbud on Sept 10, 2021 19:20:24 GMT -5
I love the old shell suit graphics. 👍
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Post by 808ministroke on Sept 11, 2021 0:43:36 GMT -5
Hey man knowledge you've Add the chance to ride a buddy buddy with a with a polini and a Honda with a polini how would you compare the 2 I know i know no it's hard to do because you didn't have the exact same pipe on either of them or the same setup in all the other variables but in a broad sense what would you say the differences were if any?
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Post by hippo008 on Sept 11, 2021 10:29:51 GMT -5
Hey man knowledge you've Add the chance to ride a buddy buddy with a with a polini and a Honda with a polini how would you compare the 2 I know i know no it's hard to do because you didn't have the exact same pipe on either of them or the same setup in all the other variables but in a broad sense what would you say the differences were if any? Its hard to compare the two. The PGO motors feel smoother and more "crisp" if that makes sense. I found that Hondas vibrate a lot and have different flow characteristics. In terms of ride they feel about the same to me. My Dio feels like it has a wider and flatter powerband than the PGO motors ive ridden. That could be a result of the pipes but im not certain. The Yasuni R is known to be a very linear pipe so im tempted to say the result is from the motor itself and not the pipes. Im not sure if the differences I feel are the result of motor design or build though. Hondas are vertical while PGOs are horiztonal. |
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Post by repherence2 on Sept 16, 2021 21:39:03 GMT -5
i like see your air box.  the air box on my engine build sits further back as well. for all i know, my engine is gonna look pretty goofy mounted on a 139qmb bike/chassis. ...my air box is spaced out and further back and the pipe is spaced out as well. |
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Post by hippo008 on Sept 23, 2021 13:36:07 GMT -5
I purchased an NCY Dio pipe to bring down the noise in my neighborhood. Nobody has complained yet but I still want to be respectful of the neighbors. Im pleasantly surprised with this pipe. Im using the same jets as my Arrow Dio pipe and it runs great. Cruising at 300°F or so with plenty of mid and low down torque. This pipe plus an upgear kit is a fantastic all-around setup. As an added bonus it actually sounds good too. The PG pipes ive tried in the past sounded like a 4T with an exhaust leak. The NCY sounds much more clean and 2T like, good sound and still very quiet compared to the Arrow and PG short. For $180 shipped I couldnt be much happier.    |
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Post by woodini on Sept 23, 2021 15:54:35 GMT -5
Killer bike! Love the shape and 80s decals
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Post by hippo008 on Sept 23, 2021 16:39:24 GMT -5
  This is my modified airbox. I was just barely able to make the coupler fit. The issue here is two-fold. First problem is that its ugly as sin. I am trying to keep my scooter clean and I cant stand the sight of this thing. The second issue is that the box will no longer function properly. Air is drawn in from one side of the airbox through the filter and into the carb. I enlarged the opening so much that the air will no longer have to pass through the filter to enter the carb. I could use some filter material and cover the intake opening but I am not sure if that will work well. The majority of the noise from my engine is now coming out of the carb. The open Polini filter and the large PWK make for a large opening for combustion sounds to escape. I think as a proof of concept ill put some foam in my cut-up OEM airbox to see if I benefit from any noise reduction. If that works well I may purchase or make a small karting style airbox. Here is an example from user braden using a similar karting airbox. I think this looks clean and most likely functions well.  |
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Post by woodini on Sept 23, 2021 17:15:40 GMT -5
Definitely looks clean
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Post by repherence2 on Sept 23, 2021 21:16:07 GMT -5
is that your stock air box? i totally agree that large PWK carbs are loud AF, especially with bellmouths or velocity stacks wide open. are you running a 28mm carb?
**p.s. i like your tires. nice job on the tire paint.
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Post by hippo008 on Sept 23, 2021 22:56:39 GMT -5
is that your stock air box? i totally agree that large PWK carbs are loud AF, especially with bellmouths or velocity stacks wide open. are you running a 28mm carb?
**p.s. i like your tires. nice job on the tire paint.
For my tires I use acetone and a oil based paint pen. The paint lasts way longer and its easier to apply. The airbox is the OE Honda airbox for the Dio 2. I hacked it up to hopefully make it work but I dont think it will. To be honest I dont understand Honda carb sizing. A 28mm carb seems so huge to me. I dont even really understand the differences between a CP or Dellorto style carb and a PWK Mikuni style. Sure ones a flat slide and the others a round slide but what does that matter? So i went with a 24mm Polini PWK. Seemed like a reasonable middle ground even though I have no idea how to fit carbs to Hondas. |
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Sum-azn-kid
Scoot Enthusiast
Posts: 183
Location: Hawaii
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Post by Sum-azn-kid on Sept 23, 2021 23:39:18 GMT -5
A cr85 dirt bike uses a pwk 28mm carb. They are topend liquid cooled motors made to be run WOT on the track. Our bikes are AC 72cc or more. And if you run on the highways or open roads you will be at WOT long periods of time too. So makes sense to me why the AC motor of less cc would need the same size carb as a bigger cc liquid cooled motor.
Im not sure why jog/minarelli motors can run 19mm carbs and not over heat. They maybe more efficient than the vertical dio motors...
I have seen dio/elite 72cc run on stock carbs and 21-24mm carbs but they lacked the topend power alot of hawaii guys like. Ive only seen a few that could tune them to not lose mph on the top.
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Post by repherence2 on Sept 23, 2021 23:47:20 GMT -5
you should be good with the 24 Polini PWK. i have only heard/read good things about the Polini PWKs vs the OKOs and fakeOKOs. probaby use way less jetting than the 28 PWK and get better velocity so more crisp. it probably wont have the dead spot that is hard to tune on the 28's on the low end. i like your logic on carb choice.
we run 28mm carbs here because all the OKOs (no matter what size) pretty much costs the same here locally. 28's are good for long WOT runs here. if you ever seen moped videos of oahu, you see lots of them them rip it on long runs. depends what you are into. pretty much there are only 3 kinds of tunes on Oahu: high speed rippers, wheelie machines, and stop light racers.
what is the diameter of the carb mouth on the 24 polini PWK?
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Post by repherence2 on Sept 24, 2021 1:05:25 GMT -5
A cr85 dirt bike uses a pwk 28mm carb. They are topend liquid cooled motors made to be run WOT on the track. Our bikes are AC 72cc or more. And if you run on the highways or open roads you will be at WOT long periods of time too. So makes sense to me why the AC motor of less cc would need the same size carb as a bigger cc liquid cooled motor. Im not sure why jog/minarelli motors can run 19mm carbs and not over heat. They maybe more efficient than the vertical dio motors... I have seen dio/elite 72cc run on stock carbs and 21-24mm carbs but they lacked the topend power alot of hawaii guys like. Ive only seen a few that could tune them to not lose mph on the top.
best explanation of the 28 PWK in relation to the 72cc!
when i went to 47mm bores on my chinarelli, at some point i could not keep the temps in check with the stock carb. it always ran hot. first suggestion involved an air scoop. my temps were still too high. next suggestion was a jog90 fan (which required modification of stock fan shroud) and air scoop. i now think that part of the problem was the rear facing intake and how small the inner diameter of the manifold is. I ran a polini cp24 with airbox adapter and it ran very well.
i ran the cp24 and rear intake on my 83cc minarelli. it was all around okay. i ran it with a UNI pod so it ran like poot when it rained. changed it up to 94cc and ran it with 26 fOKO power jet. finally switched it out with a 28 OKO and loved it for the WOT performance. 26 with power jet is cool but the i dont like the overlap between the main and PJ. i could not get a nice balance between the main and the PJ. WOT with PJ was nice but 3/4 throttle area made me uncomfortable. too much on the main, WOT suffers on PJ. Not enough on the main, 3/4 throttle got hot.
low throttle on an open 28 OKO sucks. however, i have found that it is possible to smooth it out with a divider and fine mesh/screen. i think that by running the fine screen over the mouth of my 28 combined with the divider, the performance is improved. i feel that the divider improves the air flow as well as vacuum at 1/2 throttle and below, and the screen helps smooth out the turbulence of the flow. that's just my opinion from finding out that they actually sell "carb screens" although i never did find a good explanation of it's purpose. the original intent of my screen was to keep rocks and debris from being swallowed up by the forward facing wide open PWK.
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Post by hippo008 on Sept 26, 2021 22:48:22 GMT -5
For some reason my kicker will take a kick fine and then on the upstroke it will bind and lock up. Electric start wont work either. The only fix is to remove the cvt cover to allow the kicker gear to retract. This has happened a few times now. Im not sure how to fix it. I removed the kickstart assembly and am running just electric start until I can figure it out.
It seems like the bulk of the engine noise is coming out of the carb at this point. I picked up an airbox from ScooterTuning to hopefully tone things down and make the scoot easier to tune.
Im having a hard time getting my CVT in tune as well. Theres something about CVTs I just dont get. I think I may start over with CVT tuning to hopefully get it right from the get-go.
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the air box on my engine build sits further back as well. for all i know, my engine is gonna look pretty goofy mounted on a 139qmb bike/chassis. ...my air box is spaced out and further back and the pipe is spaced out as well. 
