furiousbob
Scoot Enthusiast
Posts: 128
Location: Pasadena, CA
|
Post by furiousbob on Dec 13, 2022 21:57:31 GMT -5
So I finally got the chintsy little brackets for the fork. I ordered these maybe a month ago and they were the original idea to mount the Aerox fender. Although I did make my own brackets, the fender was still swaying in the wind. So I used the new brackets to reinforce the fender. I did have to turn the ID out maybe "0.050 and cut a notch in the center so it would fit the fork.   I am ITCHING to ride this thing but I still need to tune the carb. After a brief search on these forums, it seems there is no conclusive jet settings for a 73cc and a pod filter. Everyone just ends up going back to the stock airbox. This has me concerned. I dug up the old factory airbox and wondered if I could maybe make an elaborate plumbing system to route the airbox back to the carb. It will require a lot of work and it would definitely look.... ugly. Am I up poop creek with this pod filter? Any suggestions? |
|
Kaos
Scoot Enthusiast
Posts: 185
|
Post by Kaos on Dec 14, 2022 11:08:54 GMT -5
I am ITCHING to ride this thing but I still need to tune the carb. After a brief search on these forums, it seems there is no conclusive jet settings for a 73cc and a pod filter. Everyone just ends up going back to the stock airbox. This has me concerned. I dug up the old factory airbox and wondered if I could maybe make an elaborate plumbing system to route the airbox back to the carb. It will require a lot of work and it would definitely look.... ugly. Am I up poop creek with this pod filter? Any suggestions? You should be able to get it working with the pod filter fine, I've run pods on big bore 50's before. I suspect its just people not really knowing how to jet a carb. I've had to increase the size on both the mains and idles with pods. You may have to play with it a bit, but its doable. |
|
|
|
Post by 90GTVert on Dec 14, 2022 11:24:18 GMT -5
You can definitely use a pod filter. Using airboxes is not because we don't know how to jet a carb. The biggest practical benefits for me are that I have found less need for jet changes and adjustments using an airbox and it's much quieter. Some setups are more picky than others. A properly setup airbox is not likely to be a restriction. I used a stock airbox with a few mods on as large as a 110cc stroker and on my TPR 86cc that wound up to 14,000RPM. 49ccscoot.proboards.com/thread/1346/modifying-stock-airbox-larger-relocation |
|
Kaos
Scoot Enthusiast
Posts: 185
|
Post by Kaos on Dec 14, 2022 11:27:44 GMT -5
You can definitely use a pod filter. Using airboxes is not because we don't know how to jet a carb. The biggest practical benefits for me are that I have found less need for jet changes and adjustments using an airbox and it's much quieter. Some setups are more picky than others. A properly setup airbox is not likely to be a restriction. I used a stock airbox with a few mods on as large as a 110cc stroker and on my TPR 86cc that wound up to 14,000RPM. 49ccscoot.proboards.com/thread/1346/modifying-stock-airbox-larger-relocationI'd love to hear that thing at 14k RPM. I'll bet that sounds bonkers! I've only ever run mine to 11k and it was screaming. |
|
|
|
Post by 90GTVert on Dec 14, 2022 11:37:54 GMT -5
I'd love to hear that thing at 14k RPM. I'll bet that sounds bonkers! I've only ever run mine to 11k and it was screaming. |
|
Kaos
Scoot Enthusiast
Posts: 185
|
Post by Kaos on Dec 14, 2022 11:54:22 GMT -5
I'd love to hear that thing at 14k RPM. I'll bet that sounds bonkers! I've only ever run mine to 11k and it was screaming. Thats beautiful. 8.1 0-50 is movin' pretty good. That looks like so much fun! Also, you did some AWESOME data collection there. I dig it. |
|
furiousbob
Scoot Enthusiast
Posts: 128
Location: Pasadena, CA
|
Post by furiousbob on Dec 14, 2022 12:51:15 GMT -5
You can definitely use a pod filter. Using airboxes is not because we don't know how to jet a carb. The biggest practical benefits for me are that I have found less need for jet changes and adjustments using an airbox and it's much quieter. Some setups are more picky than others. A properly setup airbox is not likely to be a restriction. I used a stock airbox with a few mods on as large as a 110cc stroker and on my TPR 86cc that wound up to 14,000RPM. 49ccscoot.proboards.com/thread/1346/modifying-stock-airbox-larger-relocationYour post was actually what got me digging up my old airbox. I wanted to see if I could do something similar. The ground clearance won't allow me to mount the airbox in the factory location and there isn't much more space for it. ALAS, I'm no stranger to tuning jets anymore ever since I picked up this Zuma. I will be spending the next little while retuning my carb. Just gotta get it done! |
|
Kaos
Scoot Enthusiast
Posts: 185
|
Post by Kaos on Dec 14, 2022 13:04:00 GMT -5
You can definitely use a pod filter. Using airboxes is not because we don't know how to jet a carb. The biggest practical benefits for me are that I have found less need for jet changes and adjustments using an airbox and it's much quieter. Some setups are more picky than others. A properly setup airbox is not likely to be a restriction. I used a stock airbox with a few mods on as large as a 110cc stroker and on my TPR 86cc that wound up to 14,000RPM. 49ccscoot.proboards.com/thread/1346/modifying-stock-airbox-larger-relocationYour post was actually what got me digging up my old airbox. I wanted to see if I could do something similar. The ground clearance won't allow me to mount the airbox in the factory location and there isn't much more space for it. ALAS, I'm no stranger to tuning jets anymore ever since I picked up this Zuma. I will be spending the next little while retuning my carb. Just gotta get it done! I gotta say, thats why I EFI everything these days... Spending countless hours rejetting carbs gets old quick. Good luck! Can't wait to see the next post where you're riding around enjoying the hells outa it! |
|
furiousbob
Scoot Enthusiast
Posts: 128
Location: Pasadena, CA
|
Post by furiousbob on Feb 19, 2023 21:43:08 GMT -5
Holy smokes it's been 3 months since my last update. In that time, I fixed my Ford 7.3L and pulled a Chevy 3.4L, ripped it apart and started building it to replace the 2.8L in my Isuzu Trooper. That's neither here nor there, though. I finally got around to swapping jets on the Zuma. Initially, the scooter was dumping a lot of white smoke on startup. Keep in mind, I have a crappy pod filter now. This was not by choice. This change had to be made to fit the stretch. Anyway, I assumed the smoke was due to a lean condition. The scooter would only top out in the low 30 mph's. I sat on it for a couple months. I swapped the 88 jet for a 92 jet today and it still dumped smoke BUT smoke went away after warmup and it now tops out at 43mph. Nowhere near the 50mph it was before. And the acceleration feels lacking. IIRC, my needle was set to the lowest setting... which is full rich? I need to refresh my memory. Now that I have the ball rolling, I want to tune it right. So I'm going to bump the jet to a 94 tomorrow. Any other suggestions, though? Here's a quick video of my buddy riding it today. We weren't wearing any gear because we were just ripping it up and down the alley. The powerband is around 9300 RPM right now. CHT is at 250F after warmup. Not terrible? imgur.com/a/CkZXYe8 |
|
|
|
Post by 808ministroke on Feb 23, 2023 7:32:40 GMT -5
Definitely is out of tune, Without knowing too much more I'm not gonna even make an assumption of rather itch rich or lean but since you had an improvement by going bigger and that's the safer way to go I would say just keep going richer until you plateau I also suspect the transmission can be tuned To make it run a lot nicer as well.
|
|
furiousbob
Scoot Enthusiast
Posts: 128
Location: Pasadena, CA
|
Post by furiousbob on Feb 23, 2023 21:34:24 GMT -5
The transmission's been tuned to hell and back. I spent something like 2 months working on that transmission. Zino finally ended my misery by getting me the right belt to complete the setup. Anyway, I'm going to keep messing with the jets when the weather lets up. I'll probably just keep stepping up jets till it starts bogging and then step it down from there. The carb isn't actually that terrible to get out from below it's new home underneath the fuel tank. Just tanks a bit of patience. Anyway, I'll keep ya'll posted. In other news, I'm gunna try and pick up a wrecked Honda Reflex this weekend to start my next project. A 250cc Honda Metropolitan  |
|
Kaos
Scoot Enthusiast
Posts: 185
|
Post by Kaos on Feb 23, 2023 22:04:32 GMT -5
other news, I'm gunna try and pick up a wrecked Honda Reflex this weekend to start my next project. A 250cc Honda Metropolitan I 100% approve of this swap. |
|
furiousbob
Scoot Enthusiast
Posts: 128
Location: Pasadena, CA
|
Post by furiousbob on Apr 29, 2023 20:49:16 GMT -5
Alright a bit of an update. I swapped the jet from a 92 to a 94 and then finally a 96. Much more lower end torque. Top end is still maxing at 40mph, though. I'd like to get it back up to 46/47 like it was before I did all this dumb stretching stuff.
I was thinking it might've been the tire size. Going from the stock 130/90r10 to the new 140/70r12. BUT the difference in diameter is only 488mm vs 500mm, respectively. If anything, the newer bigger size should net me more top speed?
|
|
|
|
Post by rollingbender on Apr 30, 2023 0:38:44 GMT -5
I’ve thoroughly enjoyed watching this build. Your craftsmanship and skills have made a beautiful bike.
Just wondering, how much has this lowered your seat height? From the factory, it would have been 30.1”.
|
|
furiousbob
Scoot Enthusiast
Posts: 128
Location: Pasadena, CA
|
Post by furiousbob on Apr 30, 2023 1:57:22 GMT -5
Oooh I'm not sure. I'll measure tomorrow. I can say, though, that my exhaust manifold is just about touching the floor with a 180lb rider on the seat. It's not safe. I do not recommend. I may end up welding titanium strips to the underbody for rainbow sparks though.
|
|
