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Post by abrewer on Aug 11, 2020 11:21:36 GMT -5
Hello,
First time posting here but I’ve been reading threads for information for a few months.
I have a 2020 Chicago Go and I would like to make it just a little faster to keep up with traffic a little better. My first thought is to upgrade the exhaust. Does anyone have any suggestions for an aftermarket exhaust that will fit fairly easily? I don’t have a garage so I only have very basic tools.
Due to COVID I can’t get my motorcycle endorsement for a couple months and can’t purchase a bigger scooter. So I’d like to make this one a little faster in the meantime.
Any help would be greatly appreciated!
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Post by tortoise2 on Aug 11, 2020 11:35:21 GMT -5
What are . . carb pilot and main jet sizes . . variator weight grams . . tire pressures? |
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Post by 90GTVert on Aug 11, 2020 12:48:06 GMT -5
 How fast is it going right now? Usually exhaust for an otherwise stock four-stroke gains noise more than performance. That is unless the current exhaust is known to be restricted. If a stock 139QMB powered scoot goes 30-35MPH pretty reliably on flat ground, that's usually normal and not restricted.
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Post by abrewer on Aug 11, 2020 14:39:32 GMT -5
The carb is a stock you-all PD18J. The main jet is #85. The pilot could be 35-38. I’m not too sure yet I haven’t taken it off. It has been difficult to find out very specific info about this carb online. I also haven’t taken apart the cvt so I don’t know what weight the rollers are. There is no info online or in the owner’s manual about stock roller weights. Tire pressures are front 32 and rear 36 psi. 10" wheels.
On a flat the bike will get up to 30-35 given enough time and no wind resistance. Sometimes I can hold 20 going uphill but not always. Depends on how long the hill is. Personally, I think it does much better than I expected. Perhaps I should aim for faster acceleration. However I don’t want to lose my top speed. I just want to be able to get there faster and maintain it going uphill.
I’ve also considered upgrading everything: 80cc bbk, new carb w/bigger jets, air intake filter and exhaust. I would do this for the education as well since i have no mechanical experience with taking apart an engine or transmission.
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Post by 90GTVert on Aug 11, 2020 15:22:46 GMT -5
If it were mine and I wanted better acceleration and maintaining speed on hills and against wind, I'd put a 47mm big bore kit on it. New carb if the current carb does not have an adjustable needle. Tune the carb after the BBK. Tune the CVT after the BBK with sliders and maybe stiffer clutch springs. The other route would be to try tuning the carb and CVT now and see if you can make enough difference to keep you happy. www.youtube.com/watch?v=K5j8gHg5kMc |
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Post by tortoise2 on Aug 11, 2020 16:28:59 GMT -5
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Post by abrewer on Aug 11, 2020 17:10:48 GMT -5
If it were mine and I wanted better acceleration and maintaining speed on hills and against wind, I'd put a 47mm big bore kit on it. New carb if the current carb does not have an adjustable needle. Tune the carb after the BBK. Tune the CVT after the BBK with sliders and maybe stiffer clutch springs. The other route would be to try tuning the carb and CVT now and see if you can make enough difference to keep you happy. www.youtube.com/watch?v=K5j8gHg5kMc
I think I'll try tuning the carb and CVT for now, starting with removing the variator spacer/regulator and tuning the carb and CVT. Thanks for the advice!
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Post by Zino on Aug 12, 2020 7:55:26 GMT -5
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Post by abrewer on Aug 13, 2020 19:02:14 GMT -5
Stopped by the Scooter Swap Shop and picked up a new NCY golden pulley, NCY pressure plate, and Motorforce 5.7g rollers. I would have bought some Dr. Pulley sliders but they were sold out. I do have 5g sliders on the way though.
Going to give it a shot Friday or Saturday. A guy at the shop also suggested trying two different rollerweights, 3 each, placed alternately, could be a possibility when tuning the cvt. Has anyone here tried that?
Also, I found out through some inquiries about stock variator parts for the Go at scooterworks that the stock rollers are 6.5 grams.
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Post by 2stroked on Aug 14, 2020 14:19:27 GMT -5
Stopped by the Scooter Swap Shop and picked up a new NCY golden pulley, NCY pressure plate, and Motorforce 5.7g rollers. I would have bought some Dr. Pulley sliders but they were sold out. I do have 5g sliders on the way though. Going to give it a shot Friday or Saturday. A guy at the shop also suggested trying two different rollerweights, 3 each, placed alternately, could be a possibility when tuning the cvt. Has anyone here tried that? Also, I found out through some inquiries about stock variator parts for the Go at scooterworks that the stock rollers are 6.5 grams. A lot of us have alternating weights in our variators. It's the easiest way to get NEAR a precise tune. |
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Post by abrewer on Aug 14, 2020 15:48:06 GMT -5
Installed the new variator and decided to try all 5.7g rollers for now. Definitely an upgrade! Acceleration seems smoother, and I can get up to 30mph a little faster. On my test run I took it over this bridge I have to cross everyday to get home where I always lose speed going up the beginning of the bridge. However this time I was actually gaining speed! Pretty happy with the new variator and rollers right now. I may look into a new clutch or maybe just clutch springs. Looking at the stock rollers I noticed they already started to get small flat spots after 500 miles.
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